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The power is supplied by a transformer, and when the thermostat makes contact between the 24 volt power and one or two of the other wires, a relay back at the heating/cooling unit activates the corresponding heat/fan/cool function of the unit(s).
Your stove may use gas, but you still have to plug it in. While it doesn't draw anywhere near the same amount of current as an electric one, a gas oven still requires electricity. The power isn't for heating, but for running the gas igniter and any accessories the unit features, such as a clock/timer and oven light.