Potential difference
The electrical potential or voltage is a measure of the electrical pressure available to force the current around a circuit. A useful comparison for these purposes is a simple system containing water such as a water tank with a pipe attached and the water passing through a half open tap. The higher the level of water above the tap, the greater the pressure forcing the water through the pipe and through the half open tap. The greater the water pressure, then the more water that will flow through the system for a given level of resistance in the system.
@BasicElectronics
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