A circuit breaker is a device used to open a circuit if too much current flows through it.
The electrical current for a home device travels in a circuit.
Current flows through a complete circuit.
The (only) protection device which works like that is a fuse. It is simply a short length of metal which melts when too much current flows through it.
True
DC = direct current.
An electrical current.
"circuit"
complex circuit
If you want to stop the current flow through Device 3 in the circuit, the switch that should be open is Switch S5. When an electric current flows through a long conductor, each free electron moves through a relatively short distance.
True
A current flows through, not across, a circuit. And, yes, you can measure it using an ammeter.
Yes. Current consists of electrons flowing in a circuit.