Explain the meaning and safety function of each of the following terms or features associated with mains electricity:
(i) The PVC outer insulation jacket on a flexible three-core mains cable.
(ii) A 3 A cartridge fuse fitted in a plug.
(iii) The protective earth conductor connected to the exposed metal chassis of an appliance.
(iv) The safety design of a Class II (double-insulated) appliance.
Modern electrical distribution boards utilise miniature circuit breakers (MCBs) rather than traditional cartridge fuses. State two operational advantages of using an MCB instead of a cartridge fuse.
28 exam-style questions on Edexcel IGCSE Physics Mains electricity. Each one has a worked solution and a mark scheme showing where the marks go.