A circuit will always have a battery (cell) as well as other components. Components, such as bulbs, buzzers, switches and motors, need a battery in order to work.

In this free teacher resource for Primary Science, presenters Mwaksy and Greg construct a simple circuit that uses cells, wires, bulbs and wires and investigate how a switch opens and closes a ...

Figure 1 This circuit works in most rechargeable batteries. It comprises a reference LED, LED REF, which operates at a constant current of 1 mA and provides reference light of constant intensity ...