One terminal of a car battery is said to be connected to "ground." Since it is not really connected to the ground, what is meant by this expression?
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Ground connection is connection to a source or sink of electric charge.
When there is a flow of excess charge then that excess charge flows into the sink.
If there is a deficiency of charge then required amount of charge is taken from the source of charge.
The metal frame serves as the common ground in the car for all electrical devices.
The voltages are measured with respect to the car’s frame which serves as ground.