A Battery, a switch and a bulb that are connected with connecting wires forms a simple circuit. When the switch is closed, the circuit forms a complete circuit around which a current flows.
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 circuits which are series and parallel.
When two bulbs 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 blubs are connected separately to the same terminals of a battery, they are said to be connected in parallel. The current from the battery flows through the two bulbs in two separate paths. There are two branches in the circuit.