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The heating element of an electric fire has a working temperature of 750C, at which...

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The heating element of an electric fire has a working temperature of 750C, at which it takes 1 kW when operating from a 250 V supply. When first switched on, it takes an initial current of 6.5 A when the air temperature is 20C. Determine the temperature coefficient of resistance of the material at 0C.

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