A rechargeable bicycle lamp is charged from a supply at a constant potential difference of 5.0 V. The charging current is 0.20 A for 300 s. During this time, 80 J is dissipated. What is the energy transferred to the chemical store of the lamp's battery?
220 J220\ \mathrm{J}220 J
80 J80\ \mathrm{J}80 J
380 J380\ \mathrm{J}380 J
300 J300\ \mathrm{J}300 J
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.