Which device converts electrical energy to heat?

A heater is designed specifically to convert electrical energy into heat energy. This process typically involves passing an electric current through a resistive material, which generates heat due to the resistance the material offers to the flow of electricity. This heat is then used for various purposes, such as warming a room or cooking food.

In contrast, a cooler generally works by removing heat from an area or substance, effectively transferring heat away rather than generating it. A generator is a device that converts mechanical energy into electrical energy, not the other way around. Lastly, a capacitor is an electrical component designed to store and release electrical energy, and while it may dissipate some heat when charging or discharging, its primary function is not to convert electrical energy to heat. Thus, a heater is the appropriate choice for this function.