olenoid switches are used to switch high power circuits on and off
using a much smaller electrical control signal to actuate the
switching. This allows extensive logic and decision making
circuitry to be performed on inexpensive microchips and small
electronic parts, with the actual switching of the high power
signals being limited to the very last step. The result is cooler
running of less sophisticated equipment. It also enables the high
power switching equipment to be limited to a remote location.
Solenoid switches are typically used on automotive engine starting
systems.
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