Resistors and Resistance

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Resistors and Resistance: Overview

This topic covers concepts such as conductivity, parallel combination of resistors, tolerance of carbon resistor, superconductors, and rheostat.

Important Questions on Resistors and Resistance

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A (i) series (ii) parallel combination of two given resistors is connected, one – by – one, across a cell. In which will the terminal potential difference, across the cell, have a higher value?

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What is Temperature Coefficient of Resistance

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Why carbon resistors find extensive use in electronic circuits?

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Define dependance of Resistance on Temperature and relationship between resistance of a conductor and its temperature.

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The carbon resistor can produce a high accuracy value of ___________.

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Carbon resistor is one of most common types of electronic used.

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What is a carbon resistor?

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A material B has twice the specific resistance of the material A. A circular wire made of B has twice the diameter of the wire made of A. Then, for the two wires to have to have the same resistance, the ratio LaLb of their respective lengths must be 

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Two rods of copper and iron with the same cross sectional area are joined at S and a steady current I flows through the rods as shown in the figure.

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Choose the most appropriate representation of charges accumulated near the junction S.

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Two wires of the same dimension but resistivity ρ1, and ρ2 are connected in series. The equivalent resistivity of the combination is

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Name the device that is used to regulate current by changing the resistance gradually.

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Name the device that is used to regulate current in a circuit by changing the resistance gradually.

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Conductivity of the metal is

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Three resistors are connected in parallel. The electric current 7.5 A is flowing in this combination from a battery of emf 30 V. If the values of two resistors are 10 Ω and 12 Ω, then write the value of third resistor in Ohms.

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Equivalent resistance of the given network is 18 Ω.
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If the series combination of 1 Ω, 2 Ω and 3 Ω are connected to a battery of emf 12 V and negligible internal resistance, obtain the potential drop across each resistance.

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Three resistors 1 Ω, 2 Ω and 3Ω are connected in series. What is the total resistance of the combination?

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Find the equivalent resistance between a and b in the given circuit diagram.

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A resistance wire of 8R is bent in the form of a circle, then what is its equivalent resistance across the ends of diameter.

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There are 5 resistances each of R Ω. First three resistances are connected in parallel, after that remaining two are connected in series, then the equivalent resistance of the combination will be-