Previous Year Question
When does electricity flow in a circuit?
A.
When the switch is ON
B.
When the switch is closed
C.
When the switch is either closed or open
D.
None of these
Correct Answer: B
Detailed Solution
Electric current flows when the electrical circuit is complete or closed. When the switch is closed, the circuit becomes complete and provides a continuous path for the flow of electric current. NCERT explains that a switch is a device that completes or breaks a circuit and that current flows in a closed electrical circuit.
In contrast, when the switch is open, the circuit is broken and current does not flow.
Important fact: In electrical terminology, closed switch = ON = current flows, whereas open switch = OFF = current does not flow.