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Electricity is the flow of electrons through metal wires and other devices such as motors,
light bulbs, computers, etc. An electron is a very small particle that has a negative charge.
Electricity is often described in terms of three basic quantities: voltage, current and
power. These quantities have formal definitions, but here we give an intuitive description
of these quantities so that they can give some meaning that you can take home.

Voltage: To have electricity we force electrons to flow through wires and
electrical devices. The push or energy we give to electrons so that they can flow
through these devices is called the voltage. In your house or apartment, the
voltage of you electricity will be 120 volts. That roughly means that the electrons
are being driven with a 120 units of ‘push’

Current: Electrical current can be thought of as the number of electrons that flow
through a wire or a device per second.

Power: