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An electrical heater has a resistance of 40ohms and draws a urrent of 4A |
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Answer» nAn electric heater DRAWS a current of 4 A and its element has a resistance of 40 Ω. If heater is SWITCHED on for 8 minutes, calculate the energy released in kilojoules.AnswerCurrent = 4AResistance = 40Ωtime = 8×60 second HEAT = i to the POWER 2 Rt=16×40×8×60= 16×24×8×10 to the power 2÷1000×1000 = 307.2 K Joules |
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