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

Fact 2: Each switch is moved up for on, and down for off.

Given the two facts above, answer the question "the flow of current in what is moved up and down?" with the following options: 
- an electrical storm
 - Veins and arteries.
 - mouth of rivers
 - a short circuit
 - an electrical circuit
 - circulatory systems
 - bad wiring
 - a hydraulic system


 

     an electrical circuit    