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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).
I would turn off the emergency switch and see what happens. If the furnace goes off, you need it. There are some gas fired steam systems where milivolts are produced by gas passing over a miniature turbine.This is enough electricity to run the thermosthat.on't forget, you'll want a convenient way to disconnect the furnace when you're working on it, or in the summer, say. Mine's right next to the furnace-if I'm doing work on the thermostat or anything, or changing the filter (I run the fan 100% of the time) I can shut it down right there.