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In a room heater an alternating current given by the expression A cos ot B...

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In a room heater an alternating current given by the expression A cos ot B sin ot produces heat at the same rate as that by a direct current I The direct current is given by the expression A I dc B I dc C ldc A B 2 A B 2 D Idc A B 2 2 A B 490

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