Fact 1: Aswitch is used to start the flow of current in an electrical circuit.

Fact 2: An electrical current is the flow of electric charge.

Given the two facts above, answer the question "A switch is used to start the what of electric charge in an electrical circuit?" with the following options: 
- emptying
 - O3
 - copper
 - flow
 - motion
 - stasis
 - deletion
 - energy


 

    flow     