An appliance's live and neutral connections are accidentally interchanged at its supply. Its fuse and single-pole switch remain in the wire intended to be live. The appliance works when switched on.
Which statement explains the danger when this switch is opened?
The switch now interrupts neutral, leaving internal parts connected to live.
The switch now interrupts earth, making the metal case store all the current.
The switch now interrupts live, leaving internal parts connected only to neutral.
The switch now interrupts both wires, increasing the voltage across the case.
81 exam-style questions on Edexcel GCSE Physics 10.4 Mains electricity, covering 10.4.1 Direct and alternating current, 10.4.2 Live, neutral and earth wires; safety, 10.4.3 Mains wire potential differences and dangers, and 10.4.4 Power ratings and energy use. Each one has a worked solution and a mark scheme showing where the marks go.