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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).
If you turned on the thermostat and the heater (or A/C) didn't come on, it may be a problem with the thermostat and not the furnace. First things first, make sure that all the settings on the thermostat are as they should be.f the furnace is completely silent, make sure the furnace has power. Check the circuit breaker and use a tester to make certain there is power at the furnace. If it has power but does not start, then the problem could be a break in the wire running from the thermostat to the furnace or with the furnace itself.