You are presented with the question "Power is produced when what happens?" and the following answer choices: 
- circuit is opened
 - circuit is broken
 - heating liquids
 - forest is destroyed
 - circuit is burned out
 - circuit is completed
 - heat energy
 - chemical reaction

Now knowing that completing a circuit causes electricity to flow through that circuit and when electric current is flowing, power is produced, choose the best answer.


 

      circuit is completed   