Electrical power unit is a term used to describe the various units of measurement used to measure electrical power. The most commonly used units are kilowatt (8 letters), megawatt (8 letters), watt (4 letters) and ohm (3 letters). Kilowatt is a unit of power equal to 1000 watts, megawatt is a unit of power equal to one million watts, watt is a unit of power equal to one joule per second, and ohm is a unit of electrical resistance equal to the resistance between two points on a conductor when a constant potential difference of one volt is applied to these points.