an electrical circuit can be represented using a circuit diagram.circuit symbols are used to represent various components of a circuit.there are two kinds of electrical circuit which are series and parallel.
when two bullbs are connected next to each other in a circuit,they are said to be connected in series.the current flows through the two bulbs in a single path.there are no branches in the circuit.
when two bullbs are connected separately to the same terminals of battery,they are said to be connected in parallel.the currrent from the batterry flows through the two bullbs in two separate paths.there are two branches in the circuit