If the resistance in a circuit connected to a constant current is halved, how is the voltage in the circuit affected? The voltage remains constant. The voltage is doubled. The voltage is reduced by a factor of 4. The voltage is reduced by a factor of 2. The voltage is quadrupled.

Question

Jewel Blackwell

Physics

10 October, 18:21

If the resistance in a circuit connected to a constant current is halved, how is the voltage in the circuit affected? The voltage remains constant. The voltage is doubled. The voltage is reduced by a factor of 4. The voltage is reduced by a factor of 2. The voltage is quadrupled.

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Answers (1)

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Mercedes Cobb · Answer 1

The voltage is reduced by a factor of 2.

Explanation:

According to the OHM's law, Voltage is directly proportional to the resistance keeping the current constant

Voltage = Current * resistance

V = I * R

when I is constant, V ∝ R

It can be seen that by keeping the current constant, as we halved the resistance, voltage will be halved.

For Example

Consider, I = 10 A R = 10Ω

then V = I * R = 10 * 10 = 100 V

Keeping current constant and by halving the resistance i. e R = 5Ω

V = I * R = 10 * 5 = 50 V

Hence, resistance in a circuit is halved, Voltage will be halved.