A series circuit is
a circuit in which resistors are arranged in a chain, so the current has only
one path to take. The current is the same through each resistor. The formula to
find the total resistance in a series circuit is REQ = R1
+ R2. A parallel circuit is a circuit in which the resistors are
arranged with their heads connected together, and their tails connected
together. The current in a parallel circuit breaks up, with some flowing along
each parallel branch and re-combining when the branches meet again. The voltage
across each resistor in parallel is the same. In a series circuit, every device must function for the circuit to
be complete. One bulb burning out in a series circuit breaks the circuit. In
parallel circuits, each light has its own circuit, so all but one light could
be burned out, and the last one will still function.
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