Calculate the current flowing in a nichrome wire immersed in 500 g of turpentine oil at 20 degree Celsius such that the temperature of oil rises to 70 degree Celsius in 5 minutes when the wire is connected to a battery of emf 24 V. The specific heat capacity of the oil is 750 j kg^-1 degree Celsius^-1
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Explanation:
Heat supplied by heating coil = V x I x T
= 24 x I x 5 x60 J
Heat gained by turpentine = m x s x t = 500 x 0.75 x 50 J
Heat lost = Heat gained
So 24 x I x 5 x60 J=500 x 0.75 x 50 J
Current flowing = I = 2.60 A
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