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gill b asked How does electrical relay works in house wiring?
And got the following answer:
An electrical relay is an electrically operated switch. It contains an electromagnet consisting of a coil of wire with an iron rod in the center. When an electric current flows through the wire, the iron becomes a magnet that attracts a steel lever and moves the lever. The lever closes a switch. A low power switch turns on the relay and the relay turns on something that requires more power. Relays are not used in ordinary house wiring, but they are used inside some equipment and appliances that may be used in an ordinary house. For example, you may have a thermostat on the wall that controls the heating. The thermostat contains a tiny switch that turns on when the temperature goes below the thermostat setting. That switch is connected to a low voltage, often 24 volts AC. The thermostat voltage is used to turn on a relay in the furnace. The relay in the furnace turns on the furnace which operates on about 120 or 240 volts and a much higher current than the current required to turn on the relay. If you listen carefully to the furnace, you may be able to hear a click inside just before the furnace starts when someone turns up the thermostat. That click is the relay inside turning on the furnace. The timers in laundry washers and dish washers and the thermostat in the refrigerator may also control the appliances with relays.