A pop-up exhibition is allowed to use a maximum of 3.60 kWh of electrical energy during a six-hour session.
The table gives information about the electrical equipment used.
| Equipment | Power in kW\mathrm{kW}kW | Operating time in h\mathrm{h}h |
|---|---|---|
| Display lighting | 0.24 | 6.0 |
| Ventilation fan | 0.18 | 6.0 |
| Space heater | 1.2 | to be determined |
Calculate the maximum operating time of the space heater, in minutes, if the display lighting and ventilation fan are used as shown.
The organisers propose operating the space heater for 60 min and reducing the operating time of the display lighting to 5.5 h. The ventilation fan would still operate for 6.0 h.
Deduce whether this schedule stays within the energy allowance.
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.