In this paper we study Maxwell’s system coupled with a heat
equation in one space dimension. The system models a microwave heating
process. The feature of the model is that the electric conductivity $\sigma(u)$ strongly
depends on the temperature. It is shown that the system has a global solution
for $\sigma(u)=1+u^k$ with any $k\ge 1$. The long time behavior of the solution is
also investigated.