Question

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

Answer 1

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