Resistance heaters are devices that generate heat by passing an electric current through a resistive material. As the current flows, the resistance of the material converts electrical energy into thermal energy, warming the surrounding area. These heaters are commonly used in various applications, including home heating, industrial processes, and appliances like toasters and hair dryers. The efficiency of resistance heaters depends on the material used, with metals like nichrome being popular due to their high resistance and durability. They are generally easy to control and can provide consistent heat, making them a reliable choice for many heating needs.