A student is building a portable camping lantern.
The lantern requires a potential difference (p.d.) of 12.0 V12.0\text{ V}12.0 V. The electromotive force (e.m.f.) of each individual cell is 1.5 V1.5\text{ V}1.5 V.
State the number of cells that the lantern needs.
Describe how these cells, the lamp, and a switch should be connected to form a functioning circuit.
When the lantern is turned on, the potential difference across the lamp is 12.0 V12.0\text{ V}12.0 V and the current is 0.40 A0.40\text{ A}0.40 A.
Calculate the resistance of the lamp.
Calculate the power of the lamp.
136 exam-style questions on CIE IGCSE Physics 4.3 Electric circuits, covering 4.3.1a Circuit diagrams and circuit components, 4.3.2a Series circuits, 4.3.2b Parallel circuits, 4.3.2c Current and potential difference in circuits, 4.3.2d Combined resistance of resistors in parallel, and 4.3.3 Action and use of circuit components. Each one has a worked solution and a mark scheme showing where the marks go.