Q17 of 330 Page 18

Define the of resistance (or Define the unit "ohm").

The ohm is defined as a resistance between two points of a conductor when a constant potential difference of 1.0 volt, applied to these points, produces in the conductor a current of 1.0 ampere, the conductor not being the seat of any electromotive force.


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16

What is meant by the "resistance of a conductor"? Write the relation between resistance, potential difference and current.

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When a 12 V battery is connected across an unknown resistor, there is a current of 2.5 mA in the circuit. Calculate the value of the resistance of the resistor.

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What happens to the resistance as the conductor is made thinner?

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Keeping the potential difference constant, the resistance of a circuit is doubled. By how much does the current changes?