All Problems

Electric Current

Problem 3.195

A conductor has a temperature-independent resistance RR and a total heat capacity C.C . At the moment t=0t=0 it is connected to a dc voltage VV. Find the time dependence of a conductor's temperature TT assuming the thermal power dissipated into surrounding space to vary as q=k(TT0),q=k\left(T-T_{0}\right), where kk is a constant, T0T_{0} is the environmental temperature (equal to the conductor's temperature at the initial moment).

Reveal Answer
TT0=(1ekt/C)V2/kRT-T_{0}=\left(1-\mathrm{e}^{-k t / C}\right) V^{2} / k R