The rear window of an automobile is defogged by attaching a thin, transparent, film-type heating element to its inner surface. By electrically heating this element, a uniform heat flux may be established at the inner surface. The interior air temperature and convection coefficient are 25 degrees C and 10 W/m2K and the exterior (ambient) air temperature and convection coefficient are -10 degrees C and 65 W/m2K. The window glass is 4mm thick, and the thermal conductivity of glass is 1.4 W/mK. Find the electrical power that must be provided per unit window area to maintain an inner surface temperature of 15 degrees C using the resistance method.