In cars, one battery terminal is connected to the metal body. How does this allow a single wire to supply current to electrical devices rather than two wires?
The loop is completed by connecting the positive battery terminal to electrical equipment, the devices' negative terminals to the chassis, and the chassis to the battery through a single wire.
For every electric circuit to work, there is a potential difference. So in an electric car system, a positive terminal of a battery is connected to the load and a negative terminal to the body.
The negative terminal of the battery is attached to the car's chassis (metal body), while the positive terminal is connected to numerous electrical equipment via a single wire in vehicles.
The negative terminal of the devices is then connected to the chassis, thus completing a loop for the current flow.
This way, the number of wires required is minimized, and wiring is less complicated.
Because the negative terminal is attached to the chassis, it has zero potential and will not electrocute passengers.
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