Fact 1: When an electrical circuit is working properly , electrical current runs through that circuit.

Fact 2: An electric circuit is the path of an electric current.

Given the two facts above, answer the question "what does an electric circuit need to work properly" with the following options: 
- complete
 - a path
 - a piston
 - radio waves
 - engines
 - multiple paths
 - energy
 - heat


 

  a path       