Electromotive Force: Electromotive Force (emf) is the force which creates the pressure that causes the current to flow through a conductor.
Its unit is a volt and is defined as the emf necessary to cause one ampere of current to flow through a resistance of one ohm
Electric Pressure is also called voltage or potential. Where the unit of volt is too large, we may use the milli-volt (mV) which is one thousandth (1/1000) of a volt or the micro-volt (𝜇V) which is (1/1000000) of a volt. Sometimes it is more conventional to use very high voltage unit, called as kilo-volt (kV), which is equal to 1000 volts.
Voltage or potential difference between two points is denoted by V.
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