ladder diagram for three circuits, circuit A is one lampholder and one duplex receptacle controlled by a single pole switch, circuit B is a single pole switch controlling the top half of a duplex receptacle that when energized, is indicated by a pilot light at the single pole switch location plus an isolated ground duplex receptacle that is always hot, circuit C is the bottom half of the switched receptacle on circuit B is to be always hot plus another duplex receptacle that is controlled from two locations using coast 3-way wiring system two circuits are 3-wire multiwire branch circuit

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Thermocouple

A thermocouple is a temperature measurement device. It includes diverse metal wires which are joined collectively to form a joint. At the same time as the junction is hot or cold, a small voltage is generated inside the measuring thermocouple electrical circuit, which corresponds to the temperature.