How does an electric heater generate heat?

An electric heater generates heat by utilizing electricity to produce heat through a process known as resistive heating. When an electric current passes through a resistance, such as a heating element made of materials like metal, it generates heat due to the resistance to the flow of electricity. This heat is then transferred to the surrounding air or surfaces, warming the environment.

The beauty of electric heaters lies in their straightforward operation—since they do not rely on combustion or other energy sources like gas or fossil fuels, they can provide a cleaner and more efficient heating method in areas where electricity is readily available. This unique mechanism is why the option highlighting the use of electricity to produce heat is correct, emphasizing the simplicity and effectiveness of electric heating technology.