The electricity is always waiting in the wires to be used. Electricity travels in a circuit. When you switch on an appliance, you complete the circuit. Electricity flows along power lines to the outlet, through the power cord into the appliance, then back through the cord to the outlet and out to the power lines again. How Electricity Is Measured Volts, amps, and watts measure electricity.
Amps measure the amount of electric current.
Watts measure the amount of work done by a certain amount of current at a certain pressure or voltage. To understand how they are related, think of water in a hose. Turning on the faucet supplies the force, which is like the voltage. The amount of water moving through the hose is like the amperage.