Find out what all the unit measurements on your bill mean Volt (V) = a unit of electrical voltage A volt is the electrical force required to push current through an electrical circuit. Most domestic homes in Ireland are supplied at a nominal voltage of 230V (single phase). Most businesses are supplied at a nominal voltage of 400V (three phase), which is frequently referred to as 'Low Voltage'. Kilovolt (kV) = 1000 volts This is the term normally used for medium and high voltages, e.g. 20 kV = 20,000 volts. Amp (A) = a unit of electric current An amp is the measurement of current flowing in an electrical circuit. Its full name is an 'ampere'. Watt (W) = a unit of electric power A watt is the unit of measurement of 'active/real' power. The power used in a basic electrical circuit is the volts multiplied by the amps. 1 volt passing a current of 1 amp through a basic circuit means that 1 watt of electric power is consumed. Kilowatt (kW) = 1000 watts (W) A kW is the term normally used for 'active/real' electric power, sometimes referred to as 'Demand' or 'Load'. Electric power is made up of two components: Active/real power (kW) Reactive/wattless power (kVAr) When these are combined they are referred to as the 'apparent' power (kVA). Kilowatt hour (kWh) = 1000 watts for 1 hour This is the basic unit of electricity consumption and refers to the real/active electric load (kW) used over time. In simple terms, 1 kWh is the amount of energy consumed by an electrical device (e.g. an electric heater) that is rated at 1kW (1000 watts) for 1 hour. A further example is ten 100-watt light bulbs used for 1 hour. A kWh is the basic unit of electricity consumption used by Electric Ireland to bill customers for the active/real power they use. Did this answer your question? Yes No Thank you for your feedback