You are presented with the question "What is a purpose of a switch in an electrical circuit?" and the following answer choices: 
- to reduce magnetic effects
 - heat production
 - to annihilate electrons
 - preventing heat transfer
 - direct energy
 - to complete the circuit
 - heat is produced
 - to circumvent resistors

Now knowing that aswitch is used to start the flow of current in an electrical circuit and electricity flows when a circuit is complete, choose the best answer.


 

      to complete the circuit   