2 million kettles at 3kW each = 6GW

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Presentation transcript:

2 million kettles at 3kW each = 6GW Mains filament lamp 10,000 W cooker 2 million kettles at 3kW each = 6GW P= E so E = Pt t E = 5000W x 20s E = 100,000 J % efficiency = OP energy x 100% IP energy = 12,000 x 100% 100,000 = 12%

a. P = E t P = 1,500,000 J 50 s P = 1,500,000 W 50 P = 30,000 W P = 30 kW b. % efficiency = OP power x 100% IP power = 30kW x 100% 100kW = 30 %

P= E so E = Pt t E = 12 kW x (20 x60 x4 ) s E = 12 k W x 4800 s E = 57,600 kJ E = 57.6 MJ Increase in the thermal energy store of the water Electric Current in the wires Increase in the thermal energy store of the surroundings. Caused by the heating from the hot shower heater ( less than 1% )