Fact 1: Electricity is used as an energy source by electrical devices.

Fact 2: Once a device is plugged into electrical outlets, it can communicate with other devices.

Given the two facts above, answer the question "what is used as an energy source to electrical outlets" with the following options: 
- engines
 - rain
 - adding heat
 - copper
 - energy
 - rays or beams
 - wires
 - electricity


 

        electricity 