An electric oven has a power of 2.5 kW. It is switched on for 90 minutes.
How much energy does the oven transfer, in joules?
2.25×102 J2.25 \times 10^{2}\ \text{J}2.25×102 J
1.35×104 J1.35 \times 10^{4}\ \text{J}1.35×104 J
2.25×105 J2.25 \times 10^{5}\ \text{J}2.25×105 J
1.35×107 J1.35 \times 10^{7}\ \text{J}1.35×107 J
44 exam-style questions on OCR GCSE Physics 7.1 Work done, covering 7.1.1 Conservation of energy in a closed system, 7.1.2 Energy stores and transfers, 7.1.3 Energy changes by heating, forces and current, 7.1.4 Quantifying energy transfers in a system, and 7.1.5 Kinetic, elastic and gravitational potential energy. Each one has a worked solution and a mark scheme showing where the marks go.