Parallel Circuits Summary
A circuit is a loop of wire with its ends connected to an energy source.
One end of the wire is connected to the positive terminal; the other end of the wire is connected to the negative terminal.
Parallel circuits have their components lying inside "parallel" loops connected to the same energy source. For example:
Failure of one component in a parallel circuit does not lead to the failure of the other components.
The more components connected in parallel, the more energy is used.
The total current flowing from a cell in a parallel circuit equals the sum of all the currents flowing in the loops.