A high-precision heater element in a chemical reactor is connected to a 15.0 V d.c. power source. The current passing through the heating coil is 2.8 A during stable operation. Show that the total electrical energy transferred to the heater in 7.5 s is about 320 J.
31 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.