Keeping the potential difference constant, the resistance of a circuit is doubled. The current will become:

(a) double
(b) half
(c) one-fourth
(d) four times

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Solution

(b) half

As we know from Ohm’s law:
Voltage = Current x Resistance
V = IR
If the voltage is constant, the resistance is doubled and the current becomes half.

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The potential difference of a circuit is constant. If the resistance of a circuit is doubled, then its current will become;

If the potential difference between the ends of a fixed resistor is halved the electric power will become.

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(B) One-Fourth

(D) Half

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