The term 'unit of electricity' encompasses a variety of measurements, including the AMPERE (6 letters), watt (4 letters), amp (3 letters), ohm (3 letters), volt (4 letters), coulomb (7 letters), JOULE (5 letters), rel (3 letters), and farad (5 letters). The AMPERE is a unit of electric current, the watt is a unit of power, the amp is a unit of electrical current equal to one AMPERE, the ohm is a unit of electrical resistance, the volt is a unit of electrical potential difference, the coulomb is a unit of electric charge, the JOULE is a unit of energy, the rel is a unit of relative electric resistance, and the farad is a unit of electrical capacitance.