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(a) Define the unit of resistance (or Define the unit ohm").
(b) What happens to the resistance as the conductor is made thinner?
(c) Keeping the potential difference constant
(a)
The resistance of a wire is 1 ohm means:
When 1 volt potential difference is applied across the wire, a current of 1 ampere will flow in the wire.
(b)
We know resistance $R \propto \frac{1}{A}$.
If the conductor is made thinner, Area A will decrease. So the resistance will increase.
(c)
Mathematically, $I = \frac{V}{R}$.
If potential difference, V is kept constant
$I \propto \frac{1}{R}$.
So if Resistance R is doubled, the current becomes half.
Updated on: 10-Oct-2022
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