Question

For current to flow, one needs a,

• A. Closed circuit
• B. Source of potential difference
• C. Both (a) and (b)
• D. Infrared radiation

Answer 1

The correct option is C

Both (a) and (b)

Concept used: Electric current

Prerequisite: Knowledge of flow of charges

Mechanism of electricity conduction:

1. When a battery is connected to a metallic conductor, then the free charges present in the conductor start flowing. The flow of these charges is known as current, and it happens due to the applied potential difference between the two ends of the metallic conductor.
2. If the circuit is open then the resistance of the circuit is very large thus the amount of electric current flows through the circuit is zero.
3. Therefore, the minimum requirements to flow the current are closed circuit and potential difference.

Thus, option C is the correct answer.