a means of resisting. Calculate the new resistance of the wire. There are four factors affecting resistance which are Temperature, Length of wire, Area of the cross-section of the wire, and nature of the material. . (c) a voltage applied to a resistor is 10 kV and the current flow is 4 mA. The equivalent resistance of a number of resistors in series will be the sum of the individual resistances. For ideal ammeters, there is zero resistance. Class-X . 12.1 ELECTRIC CURRENT AND CIRCUIT. Resistivity. Question 1. Lets check the effect of radius or diameter of the resistance wire, length of resistance wire and the material of resistance wire on the amount of resistance offered. Resistance (also known as ohmic resistance or electrical resistance) is a measure of the opposition to current flow in an electrical circuit. It is dependent on certain factors. Resistance is a measure of the opposition to current flow in an electrical circuit also known as ohmic resistance or electrical resistance. (b) Represent it (Ohm's law) mathematically. An electrical circuit has resistance to control to flow of current. Calculate the resistance of the electric lamp. [2015] Answer. (ii) Give one important function of each of these two devices. Also See: CBSE Class 10 Hindi MCQs. Answer. It is also known that the electrons do not move freely through a conductors crystalline structure. Elkonite 1W3 and Elkonite 3W3 Tungsten-Copper alloys are generally used for flash and butt welding die inserts where higher electrical and thermal conductivity is necessary and where a degree of malleability is desirable. Question: (a) With the help of suitable circuit diagram prove that the reciprocal of the equivalent resistance of a group of resistances joined in parallel is equal to the sum of the reciprocal of the individual resistances. Question 3. An electric lamp of resistance 20 and a conductor of resistance 4 are connected to a 6 V battery as shown in the circuit given below. (b) Turn the switch to the left side so as the resistace increases. Give their relationship with ampere. 18. (c) a voltage applied to a resistor is 10 kV and the current flow is 4 mA. Figure (a) shows three resistors of resistances R1, R2 and R3 connected in series. When both the bodies are positively charged [] Practice: Identifying types of 1 kWh =3.6 10 6 Joule. Connect wire B between the terminal,note ammeter reading. Resistance is defined as the property of a conductor to resist the flow of charges through it. Define the electric resistivity of a material and also write its SI unit. Question 1: What is the Symbol of Carbon Resistor? The equation above for heat flow is analogous to the relation for electric current flow I, expressed as:. Solution : Q1. resistance: [noun] an act or instance of resisting : opposition. Equivalent Resistance in Series Connection. Important Questions for CBSE Class 10 Science Chapter 12 - Electricity 2 Mark Question solved by our expert teachers for academic year 2021-22. Series resistors. S.I. Asked by pdcavita 26th November 2017 9:13 PM. The physical property of a substance that opposes the flow of current, i.e. Resistivity is a physical property of a certain substance that has specific dimensions. 10. Parallel Combination. A cell of e.m.f 1.5 V and internal resistance 10 Ohms is connected to a resistance of 5 Ohms, with an ammeter in series what is the reading of the ammeter? where R e = L/ e A is the electric resistance and V 1 V 2 is the voltage difference across the resistance ( e is the electrical conductivity). Question 12. Differentiate between Resistance and Resistivity. Resistance is defined as an opposition to current flow. The total potential difference across the combination of resistors connected in series is equal to the sum of the potential differences across the individual resistors. Answer: Small currents are expressed using a unit called miiliampere or microampere. What is a Parallel Circuit? Find the power dissipated when: (a) a current of 5 mA flows through a resistance of 20 k. Therefore, the current flows in the circuit shown by the Ammeter A. (b) In an electric circuit two resistors of 12 each are 1 miiliampere (1 mA) = 10 -3 A. S.I. Also, resistance is an aspect that opposes the flowing of free electrons. if l = 1 m and A = 1 m2 then R = It depends on material of the conductor Denoted by rho i.e. Q. Properties of Electric Charge: (i) Unlike charges attract each other and like charges repel each other. Solution : (a) Turn the switch to right side so as the resistance decreases. Calculate the number of electrons constituting one coulomb of charge. 2. Key Differences between Resistance and Resistivity. (a) With the help of a suitable circuit diagram prove that the reciprocal of the equivalent resistance of a group of resistors joined in parallel is equal to the sum of the reciprocals of the individual resistances. This is the currently selected item. Welcome to Sarthaks eConnect: A unique platform where students can interact with teachers/experts/students to get solutions to their queries. George Simon ohm(in 1826)studied relationship between I and V across the ends of conductor. NCERT Solutions for Class 10 Social Science; NCERT Solutions for Class 10 Maths. A number of resistors are joined together in different ways in many electrical devices. Resistance of this voltmeter is infinite. Analogy to Electric Resistance. Now the resistance 10 and R are in parallel. Ohms law sample problems for CBSE, ICSE class 9 and class 10 physics. Sketch a circuit diagram of an electric circuit consisting of a cell, an electric bulb, an ammeter, a voltmeter and a plug key. R = V/I. S.I. Welcome to Sarthaks eConnect: A unique platform where students can interact with teachers/experts/students to get solutions to their queries. how many chlorine atoms are in the formula 4NaCl. Resistivity is the obstruction offered to the flow of current by UNIT AREA OF the conductor. Fixed resistors typically have only one resistance value. Ohms Law states that electric current flowing in a conductor is directly proportional to potential difference across the ends of the conductor,provided temperature and other physical conditions remains constant.. V=IR. electrons, is called resistance. In which direction conventional current and electronic current flow from a source of electricity ? The unit for resistivity is the ohm-metre. A resistor is a passive electrical two-terminal component that as a circuit element performs electrical resistance. On the nature of its material. Q. Conductivity: It is defined as the reciprocal of resistivity and it is denoted by mho () (ohm spelt backwards). CBSE X Science. Factors Affecting Resistance: The word Resistance is an important term in electrical terminology.It means opposition to electric current. In contrast, resistivity is any materials property that tells the resistance of the material with a particular dimension. Question 29. And which of them is an insulator ? Find the power dissipated when: (a) a current of 5 mA flows through a resistance of 20 k. The rate of heat transfer through a layer Zigya App. The sum of the current in each individual branch is equal to the current outside the branches. Let us study what are the factors affecting resistance. The working temperature range for most thermistors is between 0C and 100C. V = V1 + V2 + V3. Lakhmir Singh Physics Class 10 Solutions Page No:58. Name a device that helps to maintain a potential difference across a conductor. A 6 ohm resistance wire is doubled up by folding. Which of the given statements is not true, regarding the electrical set-up for the verification of Ohms law: A. So, the resistance will be 22 x 10 2 +- 10% . The formula for the electrical resistance is: R = V/I (The resistance is symbolized by a letter R) The S.I. Also, resistors refer to the components of the electric circuits. All the materials certainly resist current flow to a certain degree. The resistance formula is as follows: Resistance = voltage drop across a resistor/ current flowing through a resistor The derivation of the formula of resistance takes place from the Ohms law. 1 kWh =3.6 10 6 Joule. A current of 1 ampere flows in a series circuit containing an electric lamp and a conductor of 5 when connected to a 10 V battery. Or. Definition and Unit of Resistance Resistance (also known as ohmic resistance or electrical resistance) is a measure of the opposition to current flow in an electrical circuit. Resistance is measured in ohms, symbolized by the Greek letter omega (). When a voltage is applied across a substance there will be an electric current through it. Note the reading of the ammeter. Specific Resistance Specific resistance is the resistance of a conductor of unit length and unit cross sectional area i.e. Therefore, R = (l / A), (rho) is constant of proportionality. R=Resistance of conductor. Question: Power of a lamp is 60 W. Find the energy in joules consumed by it in 1 s. Answer: P = 60W, t = 1 s. Energy = (VI)t. E = Pxt = 601 J. E = 60 J. Resistance of a conductor is ICSE Solutions for Class 10 Physics Electricity. Resistance is measured in ohms. . The potential difference across the terminals of a cell is 1.5 volt. unit of charge is coulomb (C). Resistance. Resistance is the property of the material that restricts the flow of electrons. inch. The value of resistance in resistors like rheostat can be changed easily ; this is generally refered to as variable resistance. Electricity Class 10 Important Questions Long Answer Type. A piece of wire of resistance R is cut into five equal parts. Question: Two bulbs have ratings 100 W, 220 V and 60 W, 220 V respectively. In Chapter Questions: (Page:202) 1. The electrical resistance of an object is a measure of its opposition to the flow of electric current. We have a circuit connected to a battery, plug key, milliammeter and a resistor in series. Calculate the number of electrons constituting one coulomb of charge. An electric heater of resistance 8 draws 15 A from the service mains for 2 hours. The equivalent resistance (i.e. Variable resistor is an electrical component used to vary the amount of Science . The resistance can be given as: \(R = \frac{{\rho l}}{A}\) Here, \(\rho \) is the resistivity of the material. B. Find the resistance offered by the filament of the bulb to the flow of the current. Conductance (G): The reciprocal of resistance is termed electrical conductance. (a) The voltage V and current I graphs for a conductor at two different temperatures T1 and T2 are shown in the figure. Their equivalent resistance is Now 2, R (= 5) and 5 resistances are in series between A and B. Resistance of a conductor is the property of conductor to oppose the flow of charge through it. Resistance of a conductor is said to be 1 ohm if a potential difference of 1 volts across the ends of conductor makes a current of 1 ampere to flow through it. If R is halved then I is doubled. If R is doubled then I is halved. how_to_reg Follow . Resistance Book Reference Resistance - Pg 123 Ohms Law (the statement and equation) - page 126 Electricity (physics) class 10th Tushar Jain. Chapter 12 Class 10 - Electricity Resistance in Series Last updated at April 28, 2020 by Teachoo In this type of combination, different resistors are joined end to end. Current electricity is generated by batteries and power plants. When two or more resistors are connected in series: The current through the circuit remains the same. Answer: Small currents are expressed using a unit called miiliampere or microampere. Resistance is measured in ohms, symbolized by the Greek letter omega (). Ohms are named after Georg Simon Ohm (1784-1854), a German physicist who studied the relationship between voltage, current and resistance. He is credited for formulating Ohm's Law. All materials resist current flow to some degree. R = V/I. Question 2. (B) Give one example to show how the resistance depends on the nature of material of the conductor. The potential difference measured by voltmeter will be accurate if no current is drawn by voltmeter. 1.5 V and internal resistance 10 ohms is connected to a resistor of 5 ohms, with an ammeter in series (see fig.). The resistance is the property of the material which obstructs the flow of current, whereas the resistivity gives the resistance of the material which has fixed dimension. We define the resistance of a conductor as the ratio of the potential difference V applied across the ends of a conductor to the current I flowing through its ends. Solution: 19. Resistance of uniform metallic conductor is directly proportional to its length and inversely proportional to area of cross-section. Calculate the resistance of the electric lamp. Basic Electronics - Ohm's Law Seggy Segaran. (b) In an electric circuit two resistors of 12 W each are joined in parallel to a 6V battery. R =. According to ASTM International, the forced entry resistance test methods are designed to determine the ability of windows and doors (also known as fenestrations) of various types to restrain, delay or frustrate forced entry. Calculate the resistance of the electric lamp. The resistance formula is as follows: Resistance = voltage drop across a resistor/ current flowing through a resistor. In electrical circuits, it is possible to replace a group of resistors with a single equivalent resistor. Shiva. LIKM 8. State the relation between the current I passing in a conductor, number of electrons (n) flowing through any cross-section of the conductor, magnitude of charge on an electron (e) and time t. Answer: I = ne/t. Rl. how does undigestive expelled out from the amoeba body . Properties of Electric Charge: (i) Unlike charges attract each other and like charges repel each other. If a bike has built-in incline and decline, the angle of the bike will affect how each resistance level feels. 3. The term "resistor" refers to a device that acts as a two-terminal passive electrical component that is used to limit or regulate the flow of electric current in electrical circuits. A 6 ohm resistance wire is doubled up by folding. Question: (i) Name two safety devices which are connected to the live wire of a household electrical circuit. It can be converted into joules as follows: 1 kWh= 1000 watt seconds. KSEEB SSLC Class 10 Science Chapter 12 Textbook Exercises. Answer (1 of 5): Resistivity is the microscopic property and resistance is the macroscopic property. 12 V so as to obtain: (2017 D) (i) minimum current (ii) maximum current (a) Describe the mode of connecting the resistances in each case. E= i (R+ r) 1.5 = I (5+10) or i= 1.5/1.5 I = 0.1 A [ANS] (b) a voltage of 400 V is applied across a 120 k resistor. and a water filter of resistance 500 are connected in parallel to a 220 V source. Answer: Resisters are connected in series. 1 mA = 10. [CBSE 2011] In series arrangement of resistance same current flows through all the resistors. GEG . (b) Fuse wire is always connected in series in a circuit as it has to chec the flow of current through the circuit and prevent the extra flow of An ammeter is used to measure the current in the circuit. unit is Ohm metre (m) Temperature of the conductor Also known as Resistivity 1 kWh = 3.6 10 6 watt second. Currently, only the NordicTrack bikes feature incline and decline. An electric lamp of resistance 20 and a conductor of resistance 4 are connected to a 6 V battery as shown in the circuit given below. CBSE Class 10 History Important Questions Chapter 3 Nationalism in India. If the equivalent resistance of this combination is R, then the ratio is . Cbse class 10th electricity shinchanindia. (c) the total effective resistance of the circuit. Conductance (also known as electrical conductance) is defined as the potential for a substance to conduct electricity. Calculate (NCERT) The total resistance of the circuit, Solution: Given; the resistance of conductor R1 = 4 W and resistance of bulb R2 = 20 W. The total resistance of the circuit can be calculated as follows: Example: Conductors of resistance 3 , 4 and 5 are connected in series in a circuit which is getting 6 V of potential difference. Parallel Combination. Q1 Page 216 - Judge the equivalent resistance when the following are connected in parallel (a) 1 and 10 6 , (b) 1 and 10 3 , and 10 6 . Class 10 Class 12. These solutions are compliant with the latest edition books, CBSE syllabus and NCERT guidelines. Resistors in series. The equivalent or overall resistance of the collection of resistors is given by the equation 1/Req = 1/R1 + 1/R2 + 1/R3 What is parallel combination class 10th? Calculate (i) the resistance of the bulb when glowing and Electric current flowing through a circuit is measured using a device called ammeter. One ampere is the current flowing through a circuit, when a charge of one coulomb flows through it in one second. what is the brainly list . This guide helps to answer common questions about resistance to these important medications. The resistance of conductor is numerically given as the ratio of potential difference across its length to the current flowing through it. This guide helps to answer common questions about resistance to these important medications. Resistance is denoted by the letter R. The resistance, R of a conductor is defined as the ratio of potential difference, V across the conductor to the current, I flowing through it. glows. Welcome to Sarthaks eConnect: A unique platform where students can interact with teachers/experts/students to get solutions to their queries. Answer (1 of 5): If you take a multimeter and select it in 20K or 200K ohms range and hold its probe in two hands then depending upon moisture in your palms, you may note a value between 20 to 30K or more. Its SI unit is mho/m or siemen/meter. Question 13. Its SI unit is -1 or Siemen. Resistances are said to be connected in parallel between two points if it is possible to proceed from one point to another along different paths.Resistances are said to be in parallel if potential across each resistance is same and equal to applied potential. It is connected with a resistance of 30 . R=Resistance of conductor. Q. Answer: Ohm-m. Which one has a greater resistance? Name the unit used to express small currents. A piece of wire of resistance R is cut into five equal parts. (iii) the potential difference across the (a) electric lamp and (b) conductor. The value of resistance in resistors like rheostat can be changed easily ; this is generally refered to as variable resistance. Welcome to Sarthaks eConnect: A unique platform where students can interact with teachers/experts/students to get solutions to their queries. 12. The sum of the current in each individual branch is equal to the current outside the branches. The shape of this resistance vs. temperature curve is determined by the properties of the materials that make up the thermistor. OR. 12.3 CIRCUIT DIAGRAM. (C) Calculate the resistance of an aluminium cable of length 10 km and diameter 2.0 mm if the resistivity of aluminium is 2.7 x 10 8 m. Answer: (A) Resistance of a conductor depends on the following factors: (1) Length of the conductor inch electrical resistance. Antibiotic resistance is a global issue recognized by the CDC as a top public health threat. Resistance is proportional to length and temperature, but inversely proportional to the materials cross-sectional area. (b) the total current in the circuit. Current electricity is normally controlled, and it is the more used phenomenon of electricity, in countless applications. The equivalent resistance of a series combination of two resistances is X Ohm. An electrical circuit must have resistance in it in order to change electrical energy to light, heat or movement. Physics ohms law fourangela. (ii) the current through the circuit. = 1/9 X( 10 11) stat . The topics and sub-topics in Chapter 12 Electricity. A) \ [32\,\Omega \] done clear. in symbol \Omega. 27. By Ohms law, resistance is inversely proportional to the current flowing through the circuit. question_answer 16) Three resistors are connected to form the sides of a triangle ABC. Conductance is the measure of how easily electrical current (i.e. Taking in to consideration 1 st three laws and neglecting 4 th law for movement, we have. Equivalent resistance of the circuit is the sum of individual resistances. Solution: Resistance is the obstruction offered to the flow of current by a conductor. Answer: The most commonly used symbol for a resistor in electrical and electronic circuit designs is a zig-zag line, with the value of its resistance expressed by the Ohms. Find the effective resistance between points A and B in ohms. 4 th law of resistance. So, the net resistance in the circuit = 5 + 8 + 12 = 25 . (a) Name and state the law that gives relationship between the potential difference (V) across the two ends of a conductor and the current (I) flowing through it. A measure of the degree to which a conductor impedes the flow of electric current induced by a voltage. The analogy between both equations is obvious. Class 10 Chemistry Chapter 12 Important Questions with Answers Electricity. If the resistance are of 10 Ohm and 40 Ohm respectively, the value of X will be: (a) 10 Ohm (b) 20 Ohm (c) 50 Ohm (d) 40 Ohm [Diksha] Answer: Class 10 Physics Electricity MCQ Question 11. Within circuits, resistors decrease the current flow and lower voltage levels. 27. Xerava is a fluorocycline antibiotic in the tetracycline class with potent activity against multi-drug resistant pathogens. The resistance of side AB is 40 ohms, side BC is 60 ohms and that of side CA is 100 ohms. 5 Mark Questions. A 1 A = 10 6. Class 10 Electricity - Resistance of a System of Resistor Revise with Concepts Combination of Resistors - Problem L1 Example Definitions Formulaes Quick Summary With Stories Basics of Electrical Resistance and its Combination 4 mins read Equivalent Resistance in Series Connection 2 mins read Equivalent Resistance in Parallel Connection 3 mins read What is the resistance of an electric bulb which is connected to a 220 V electric supply and has a current of 20 A flowing through it? Resistance of a conductor is An ammeter is connected in a series in the circuit. Actually Rheostat is a Variable resistance, it means we can change the value resistance in the circuit.. Resistance and Resistivity Class 10 Science Resistance Resistance is a property of conductor due to which it resists or opposes the flow of electric current through it. Xerava is a fluorocycline antibiotic in the tetracycline class with potent activity against multi-drug resistant pathogens. NCERT Solutions for Class 10 Maths Chapter 1; Resistance is defined as the property of the conductor which opposes the flow of electric current. (one after the another) Example This is done to Increase Resistance of Circuit In this case Total Resistance of circuit is equal to sum of Individual Resistance of the Resistors We provide step by step solutions for the questions given in Class 10 Science textbook as per CBSE Board guidelines from the latest NCERT book for Class 10 Science. Therefore, the following are the factors on which the resistance of the conductor depends: 1. What is Resistance and its Types. Length of a Conductor: Consider a Copper wire of length 1 m and connect it between terminals A and B of the circuit. RWMA Class 10 Elkonite 1W3 , Elkonite 3W3 , And Elkonite 5W3. (iii) the potential difference across the (a) electric lamp and (b) conductor. As radiological safety in hospitals all employees working in a radiography room must put on a fiber-glass apron a) True b) False. 1 stat = 9 X 10 11 . 19 = 6.25 10. The resistance of the conductor depends upon the temperature of it. What is the reading of the ammeter? For example, level 14 on a flat grade will be much easier than level 14 on a 10% grade even though resistance is the same. Resistivity is the characteristic property of the material by which it resists the amount of current through it. Name the unit used to express small currents. Resistance is a force, such as friction, that operates opposite to the direction of motion of a body (motion of current) and tends to decelerate or slow down the body's motion. ICSE Paper 2010 PHYSICS (Two hours) Their equivalent resistance is R = 2 + 3 + 5 = 10. Question. Conductivity ( ) = 1 . Nisha has given the correct explanation of the electrical conductivity of air. Question 12. The property of a conductor by virtue of which it opposes the flow of electric current through it is called resistance. Q. Question 1. Electricity Worksheets Class 10 Science. Electricity. Resistivity is a property of the material, resistance depends on the size and shape. RESISTANCE Resistance is a measure of the opposition to current flow in an electrical circuit RESISTANCE OF CONDUCTERS It is defined as the opposition to the flow of electrical current through a conductor METALS WITH HIGH RESISTANT Aluminium,Tungste and Iron offers high resistance Class 10 and Class 12 tuition classes. Write the relation between coulomb and ampere. Thus, Equivalent Resistance will be resistor_ 1 + resistor_ 2 + resistor_3 (CBSE 2012) Answer: A material having low resistivity is a good conductor. It is represented by the uppercase letter R. The standard unit of resistance is the ohm , sometimes written out as a word, and sometimes symbolized by the uppercase Greek letter omega: MIL-C-5541 Class 1A does not require electrical conductivity. Q. A battery of e.m.f. (i) the total resistance of the circuit. Extra Questions for Class 10 Science Chapter 12 Short Answer Type I. Electricity . What is a Parallel Circuit? R=Resistance of conductor. Parallel resistors (part 1) Parallel resistors (part 2) Parallel resistors (part 3) Practice: Finding equivalent resistance. Answer: Ohm-m. Question. 15 V supplies a current of 2 A for 5 min. (ii) The.force between two charges varies directly as the product of two charges and inversely as the square of the distance (r) between both charges (q 1 and q 2 ). The ohm is denoted by the Greek 5. Write a difference between maximum and minimum effective resistance. Calculate the new resistance of the wire. Class 10 Science Ch 12 MCQ Question 10. It can be converted into joules as follows: 1 kWh= 1000 watt seconds. (CBSE 2014) Answer: Question 12. The ammeter is connected in series circuit. (ii) the current through the circuit. The way a surface offers resistance to movement by offering friction, conductors oppose the flow of current. So, using Ohms law V = 0.24 12 V = 2.88 V. Hence, the reading in the ammeter is 0.24 and voltmeter is 2.88. Answer: Electronic current is always in opposite direction to conventional current. total resistance) will get added and hence the current drawn by the circuit will be less. Resistance of metallic conductor increase with increase in temperature of the conductor. These parts are then connected in parallel. Students (upto class 10+2) preparing for All Government Exams, CBSE Board Exam, ICSE Board Exam, State Board Exam, JEE (Mains+Advance) and NEET can ask questions from any subject and get quick answers by unit of the resistance is Ohm, where: Question 8. Q. And so resistance depends upon the properties of the object. EBARD Milk Egg 9. Calculate the new resistance of the wire. 19. Ohms are measured as resistance, symbolised by the Greek letter omega (). Copper wire (A)= length (l) , area of cross section X. copper wire (B)=length (l),area of cross section X. Connect wire A between the terminal,note ammeter reading. 28. R 1/A. 19. Answered by Expert. The resistivity of a material is the resistance of a wire of that material of unit length and unit cross-sectional area. Question 3. Unit of resistance is ohm. ICSE Class 10 Physics Current Electricity Numerical Problems. For the circuit shown in the diagram given below: Calculate: (a) the value of current through each resistor. Mil-C-5541 [link is to free spec at Defense Logistics Agency, dla.mil] Class 3 requires maximum 5000 Ohm per sq. A New Approach to ICSE Physics Part 2 Class 10 Solutions Electric Circuits, Resistance & Ohms Law Exercise 1 Question 1. George Simon ohm(in 1826)studied relationship between I and V across the ends of conductor. An electrical circuit has resistance to control to flow of current. (c) Draw a circuit diagram for the verification of Ohm's law. Static electricity is usually uncontrolled, and just happens occasionally or at irregular intervals. ERUBTT 7. Thus: The SI unit of resistance is ohm. Another unit of resistance is emu of resistance and it is related to ohm as, 1 emu of resistance = 1emuofpotential/1emuofcurrent = 10-8 V/10A = 10-9 . Two resistors, with resistance 10 and 15 , are to be connected to a battery of e.m.f. Find : (a) The total resistance of three lengths of this wire each 1.5 m long, in parallel. A battery of e.m.f. R = resistance (Ohms, ) V = voltage difference which is between the two ends of a resistor (Volts, V) I = the current which flows through a resistor (Amperes, A) The resistivity of a material depends on its nature and the temperature of the conductor, but not on its shape and size. The equivalent or overall resistance of the collection of resistors is given by the equation 1/Req = 1/R1 + 1/R2 + 1/R3 What is parallel combination class 10th? These parts are then connected in parallel. Resistance is known that the directed movement of electrons constitutes a current flow. 15 V supplies a current of 2 A for 5 min. Question 1. The potential difference becomes sum of the individual potential difference across each resistor.