Question

The potential difference across an electric heater is 60 V when it draws a current of 4 A from the source. How much current will the heater draw if the potential difference is increased to 120 V.

• A. 2 A
• B. 4 A
• C. 8 A
• D. 16 A

Answer 1

The correct option is C 8 A

According to Ohm’s law, voltage across the ends of a conductor is directly proportional to the current flowing through the conductor.
Since here the voltage has become twice the initial voltage, the current will also increase to twice its initial value.
Hence, when the voltage is increased to 120 V, the current drawn will be 8 A.