The Electrician
The terms pole and throw are used to describe switch contact variations. A pole is a set of contacts or terminals that are connected to a single circuit. A throw is one of two or more positions that the switch can adopt. A single-throw switch has one position that closes contacts, a double-throw switch has two positions.
“Single-pole, double-throw” switches, such as the ones illustrated in this puzzle, are called “two-way” switches in British English, whereas they are generally called “three-way” switches in American terminology. A “two-way” switch in American English refers to a “single pole, single throw” switch.
Terminal D must connect to terminal I, and terminal E must connect to terminal J. D to J and E to I will also work. The light bulb and the power source must be connected in series, A to G, for example. Terminal F then connects to C and terminal B connects to H. F to H and B to C will also work. Either switch can then turn the bulb on or off.
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