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Electricity and Electronics for Renewable Energy Technology by Ahmad Hemami

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Appendix B: Switches

A switch is a principal element in any device or circuit because we need to have a control to turn a device on and off. Like any other component, to be used in a circuit, a switch must be rated for the circuit. For example, in buildings in North America, most of the switches that are used for lighting are 15 A and good for 120 V. Thus, for the circuit of a dryer, for instance, which takes more current than the other appliances, such a switch should not be used.

In addition to the ordinary switches you are more familiar with, there are other switches that you should know about. The ordinary switch has two terminals and has two states: on and off. Thus, its function is to connect or disconnect the two terminals. This type of ...

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