A live-to-case fault in an appliance is being investigated using a simplified circuit model. The potential difference across the complete fault path is 230 V, and its resistance is 46 Ω. The fuse is rated at 13 A. Ignore all other currents.
Which pair gives the fault current and the expected response of the fuse?
5.0 A5.0\ \mathrm{A}5.0 A; the fuse is not expected to melt.
5.0 A5.0\ \mathrm{A}5.0 A; the fuse is expected to melt.
0.20 A0.20\ \mathrm{A}0.20 A; the fuse is not expected to melt.
0.20 A0.20\ \mathrm{A}0.20 A; the fuse is expected to melt.
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.