cause the charge to build. increase and decrease the voltage. cause the current to change direction. stop and start the flow of current.
I gave my students this multiple choice question: When a switch is used in an electrical circuit, the switch can

Only one answer is correct among these 4 choices:
- cause the charge to build.
- increase and decrease the voltage.
- cause the current to change direction.
- stop and start the flow of current.

Could you tell me which one is correct?

stop and start the flow of current.