Question

A heating element made of tungsten wire is connected to a large battery that has negligible internal resistance.

When the heating element reaches 80.0∘C, it consumes electrical energy at a rate of 480 W . Assume that the temperature coefficient of resistivity has the value given in Table 25.2 in the textbook and that it is constant over the temperature range in this problem. In the equation

R(T)=R0[1+α(T−T0)]

take T0 to be 20.0∘C.

  1. What is its power consumption when the temperature of the heating element is 130.0 ∘C?