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Energy The Energy absorbed by a user or supplied by a generator is the Power (P) product for the time (t). The power is calculated in Watts, and the time in seconds, the Energy is calculated in Joules(J) . Therebefore, Energy is always calculated in multiples of the joule, and the most used is the kWh (kilowatt-hour), representing the power of 1 kW delivered for the time of one hour. and is calculated with the formula: E = P * t (kWh) 1 kWh = 1000 Watt; 1 hour = 3600 sec; so: 1 kWh= 1000 W * 3600 sec = 3,6 * 10⁶ J |