What Is Voltage?


Simple Definition:

Voltage is the measure of electrical potential difference [the difference in electric charge] between two points in a circuit. It represents the force that pushes electric charges [particles that carry electricity] to move from one point to another. Voltage is measured in volts (V).


  • When you plug in a lamp into an electrical outlet, the voltage provided by the outlet creates an electrical current in the circuit, and enables the lamp to light up.
  • The battery in a mobile phone provides a certain voltage, allowing the phone to function and charge.
  • A power supply unit in a computer provides different voltages, such as 5V or 12V, to power various components.

Very Simple Definition:

Voltage is the force that makes electricity flow.


  • When you turn on a light switch, the voltage from the electrical wires allows the light bulb to turn on.
  • When you charge your phone by connecting it to a charger, the voltage from the charger fills up the phone’s battery.

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