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

Fact 2: Electricity flows when a circuit is complete.

Given the two facts above, answer the question "What is a purpose of a switch in an electrical circuit?" with the following options: 
- to reduce magnetic effects
 - heat production
 - to annihilate electrons
 - preventing heat transfer
 - direct energy
 - to complete the circuit
 - heat is produced
 - to circumvent resistors


 

      to complete the circuit   