The resistance of an electrical toaster has a temperature dependence given by R(T) = R₀ [1 + (T − T₀)] in its range of operation. At T₀ = 300 K, R = 100 and at T = 500 K, R = 120 . The toaster is connected to a voltage source at 200 V and its temperature is raised at a constant rate
from 300 to 500 K in 30 s. The total work done in raising the temperature is :