ELECTRIC CIRCUITS

An electric circuit is a simple connection of wires and other electronic parts that has current flowing through it. An example of an electric circuit is

As current passes through a circuit, bundles of electrons about 1 million every 5 seconds are moving past each point in the circuit at a speed of approximately 3.2 x 10-14 m/s with a charge of approximately 5 million x 1.6022 x 10 -19 coulombs. So that’s a lot of charges!

TYPES OF CIRCUITS

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 total resistance of the circuit is found by simply adding up the resistance values of the individual resistors.

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.