A portable laboratory bench is connected to the 230 V mains supply through a plug fitted with a 13 A fuse. Four appliances are connected in parallel and are all working at their power ratings.
| Appliance | Power rating in W\text{W}W |
|---|---|
| heater | 1200 |
| soldering station | 460 |
| ventilation fan | 180 |
| inspection lamp | 50 |
A hot plate rated at 1150 W is to be connected to the bench without changing the fuse.
Determine whether the hot plate can be used without melting the fuse and calculate the greatest power rating of a replacement hot plate that would not make the fuse 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.