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Heated seats are often thought of as a luxury item and are most often included in high-end cars. The actual technology behind heated seats, however, is no different than that used in electric blankets, hair dryers, water heaters and anything else that uses electricity to produce heat. Heated seats are powered by a heating element, a long strip of material that functions as a resistor. A resistor resists the flow of electricity. When electric current flows through it, the energy is turned into heat, which flows through the seat, warming the rider.

The longer the seat cushion stays on, the hotter it gets. If it were to stay on for too long, it would get hot enough to become uncomfortable or even dangerous to sit in. It could even start a fire in the cushion. To prevent this, most car seat heaters have a thermostat. The thermostat measures the temperature in the cushion. When it reaches a certain temperature, the thermostat sends a signal, automatically turning off the relay until the seat cools down a bit. At that point, the thermostat turns the relay back on again. Many seat cushions also have "high" and "low" settings that let the driver control the temperature of the seat cushions.

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