It creates a spark. It breaks an electrical circuit. It generates electricity. It completes an electrical circuit.
I gave my students this multiple choice question: How does flipping a switch turn on a light?

Only one answer is correct among these 4 choices:
- It creates a spark.
- It breaks an electrical circuit.
- It generates electricity.
- It completes an electrical circuit.

Could you tell me which one is correct?

It completes an electrical circuit.