(phase angle) between voltage and amperage. ElectricEnergyisE=P×t− measured in watt-hours, or also in kWh. 1J = 1N×m = 1W×s Power Formula 2– Mechanical power equation:PowerP=E⁄twhere powerPis in watts, PowerP= work / time(W⁄t).EnergyEis in joules, and timetis in seco...