During a test, an automatic gate completes 30 opening and closing cycles. In each cycle, its motor runs for 4.0 s while the gate opens and for 6.0 s while it closes. The motor transfers a total of 90 kJ during the test. What is the power of the motor while it is running?
750 W750\ \mathrm{W}750 W
9.0 kW9.0\ \mathrm{kW}9.0 kW
500 W500\ \mathrm{W}500 W
300 W300\ \mathrm{W}300 W
105 exam-style questions on Edexcel GCSE Physics 10.3 Electrical energy and power, covering 10.3.1 The heating effect of an electric current, 10.3.2 Reducing energy transfer in wires, 10.3.3 Advantages and disadvantages of the heating effect, 10.3.4 Energy transferred by an electrical circuit, 10.3.5 Electrical power, and 10.3.6 Energy transfers in domestic devices. Each one has a worked solution and a mark scheme showing where the marks go.