Series and parallel connections

You should know the difference between series and parallel connections in circuits.

Series connections

Components that are connected one after another on the same loop of the circuit are connected in series. The current that flows in each component connected in series is the same.

Two lamps connected in series

The circuit diagram shows a circuit with two lamps connected in series. If one lamp breaks, the other lamp will not be lit.

Two lamps connected in parallel

The diagram shows a circuit with two lamps connected in parallel. If one lamp breaks, the other lamp will still be lit.

Because a parallel circuit has more paths for charges to flow along, the current is bigger, and the resistance of the whole circuit is smaller.

Which of the circuits below are connected in series and which are connected in parallel? Move your mouse over each circuit to check your answers.