A phone charger supplies a potential difference of 5.0 V. The current is 1.2 A.
The phone is charged for 30 minutes30\ \text{minutes}30 minutes.
How much energy is transferred to the phone?
180 J180\ \text{J}180 J
2160 J2160\ \text{J}2160 J
10 800 J10\,800\ \text{J}10800 J
7500 J7500\ \text{J}7500 J
42 exam-style questions on OCR GCSE Physics 3.2 Simple circuits, covering 3.2.1 Series and parallel circuits, 3.2.2 Circuit symbols and circuit diagrams, 3.2.3 Current, potential difference and resistance, 3.2.4 Ohm's law, 3.2.5 Ohmic and non-ohmic resistors, 3.2.6 Designing circuits to investigate resistance, 3.2.7 Linear and non-linear circuit components, 3.2.8 Current-potential difference graphs for components, 3.2.9 Resistance in series and parallel, 3.2.10 Series and parallel circuit problems, 3.2.11 Circuits for measurement and testing, 3.2.12 Power transfer in circuit devices, and 3.2.13 Energy and power in resistor circuits. Each one has a worked solution and a mark scheme showing where the marks go.