An electric space heater is connected to the mains electricity supply.
The label on the heater contains the following information:
| Space Heater | Model SH-200 |
|---|---|
| Voltage: | 230 V230\text{ V}230 V |
| Power: | 1100 W1100\text{ W}1100 W |
| Warning: | Disconnect from the mains supply before removing the protective metal grille. |
Explain why the safety warning states, 'Disconnect from the mains supply before removing the protective metal grille.'
The heater is switched on. Calculate the current in the heater, using the information from the label. Give your answer to 2 significant figures.
The table below shows some electricity meter readings representing the use of the space heater during November.
| Date | Meter reading / 1 kWh1\text{ kWh}1 kWh |
|---|---|
| 1st November | 512451245124 |
| 30th November | 516251625162 |
Electrical energy costs 22 cents22\text{ cents}22 cents per kWh\text{kWh}kWh.
Calculate the cost of using the heater from 1st November until 30th November.
452 exam-style questions on CIE IGCSE Physics 4.2 Electrical quantities, covering 4.2.1a Positive and negative charge, 4.2.1b Charging by friction and detecting charge, 4.2.1c Electrical conductors and insulators, 4.2.1d Electric fields and electric field patterns, 4.2.2a Electric current, charge and measuring current, 4.2.2b Conduction in metals and the direction of current, 4.2.2c Direct current and alternating current, 4.2.3a Electromotive force, 4.2.3b Potential difference and voltmeters, 4.2.4a Resistance, 4.2.4b Resistance of a metallic wire, 4.2.4c Current–voltage graphs, and 4.2.5 Electrical energy and electrical power. Each one has a worked solution and a mark scheme showing where the marks go.