There are many fuses, each protecting a small group of components, so that one blown fuse does not shut down the whole system. Many of the fuses are grouped together in a fuse box, but there may also be line fuses in the wiring.
The electrical system of a car is a closed circuit with an independent power source the battery. It operates on a small fraction of the power of a household circuit. Current flows along a single cable from the battery to the component being powered, and back to the battery through the cars metal body. The body is connected to the earth terminal of the battery by a thick cable.
Altrushare - Wiring Diagram Gallery
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