Select from:
[A]. energy.
[B]. a doorbell.
[C]. heat energy.
[D]. kinetic energy.
[E]. simple.
[F]. Firecrackers.
[G]. cycles.
[H]. deltas.
Q: Fact 1: Aswitch is used to start the flow of current in an electrical circuit. Fact 2: Some systems have an additional connection for a second doorbell switch. Given the two facts above, what is used to start the flow of current in an electrical circuit?
A:
[B].