Another terminal is connected to a wire that travels to the other terminal on the button. The transformer's other terminal connects to one of three terminals on the signaling device. ![]() A doorbell transformer steps down the 120 or 240-volt AC electrical power to a lower voltage, typically 6 to 24 volts. One terminal of this button is wired to a terminal on a transformer. Pressing the doorbell button, a single-pole, single-throw (SPST) pushbutton switch momentarily closes the doorbell circuit. In most wired systems, a button on the outside next to the door, located around the height of the doorknob, activates a signaling device (usually a chime, bell, or buzzer) inside the building. It is unclear whether bells were rung by wire and pulleys, or by electrical connection. ![]() Old door bell pull knobs in Edinburgh, United Kingdom.
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