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Voltage, measured in volts (V), is the amount of force in which charge carriers are being moved in an electric current.

Common Source Voltages

High power transmission lines230kV - 500kV
North American Household Mains~117V (110 nominal)
European Household Mains~220V (230 nominal)
AA Battery1.5V
USB Power5V
Netduino Digital IO3.3V
Low-power Peripherals1.8V

Common Unit Magnitudes

MagnitudeValue in volts
microvolt (µV)0.000001V
millivolt (mV)0.001V
volt (V)1.0V
kilovolt (kV)1,000V
megavolt (MV)1,000,000V

Further Reading

For a much more in depth discussion regarding amps, see the Amount and Force section in part 2 of the Electronics Tutorial