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A current of 2.50 A passing through a he...

A current of `2.50` A passing through a heating coil immersed in `180 g` of paraffin (specific heat capacity `2.00 J g^(-1) K^(-1)`) contained in a `100 g` calorimeter (specific heat capacity `0.400 J g^(-1) K^(-1)`) raise the temperature from `5^(@)C` below room temperature to `5^(@)C` above room temperature in `100 s`. the reading of the voltmeter connected across the heating coil is

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