What is a volt?
The volt (referred to with the symbol V) is the Standard International (SI) unit of electromotive force or the potential difference required to carry 1 ampere of current through a resistance of 1 Ohm.
Voltages are sometimes expressed in units representing power-of-10 multiples or fractions of one volt:
A kilovolt (kV) is equal to one thousand volts.
A millivolt (mV) is equal to one-thousandth of a volt.
The next step is to read more on how this then applies to cables as a voltage rating - the maximum voltage a cable can operate at - learn the definitions commonly used for low, medium and high voltages; and start to understand voltage drop for when you are installing cables in an electrical system.
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