You are presented with the quiz "what gives electric power" But you don't know the answer, so you turn to your teacher to ask for hints. He says that "aswitch is used to start the flow of current in an electrical circuit" and "electric power is ready to use at the flip of a switch". So, what's the best answer to the question?

pick from the following. 1. televisions 2. heat energy 3. energy 4. current flow 5. kinetic energy 6. engines 7. weather 8. air conditioners
The answer is:
4.