An electrical circuit is a device that uses electricity to perform a
task, such as run a vacuum or power a lamp. The circuit is a closed loop
formed by a power source, wires, a fuse, a load, and a switch.
Electricity flows through the circuit and is delivered to the object it
is powering, such as the vacuum motor or lightbulb, after which the
electricity is sent back to the original source; this return of
electricity enables the circuit to keep the electricity current flowing.
Three types of electrical circuits exist: the series circuit, the parallel circuit,
and the series-parallel circuit; depending on the circuit type, it may
be possible for electricity to continue flowing should a circuit stop
working. Two concepts, Ohm's
Law and source voltage, can affect the amount of electricity flowing
through a circuit, and therefore, how well an electrical circuit
functions.
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