An electric heater is connected to a 240 V supply, and there is a current of 15 A in the heater. It takes 15 minutes15\text{ minutes}15 minutes to warm a room to the required temperature.
How much energy is supplied by the heater?
3.6×103 J3.6 \times 10^3\text{ J}3.6×103 J
5.4×104 J5.4 \times 10^4\text{ J}5.4×104 J
1.6×105 J1.6 \times 10^5\text{ J}1.6×105 J
3.2×106 J3.2 \times 10^6\text{ J}3.2×106 J
69 exam-style questions on CIE IGCSE Physics 4.2.5 Electrical energy and electrical power. Each one has a worked solution and a mark scheme showing where the marks go.