# Mains Electricity Focus questions for Pearson Edexcel IGCSE Physics

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1. Write down a few domestic appliances.
2. What does wire insulation prevent?
3. Explain what is meant by double insulation.
4. Draw the symbol for double insulation?
5. How does Earthing an appliance work?
6. What is a fuse and how does it work?
7. Draw the symbol for a fuse.
8. Explain how a circuit breaker works.
9. What happens to a resistor when a current flows through it? How can this be put to use?
10. Write down an equation to calculate electrical power using current and potential voltage. Remember that potential difference is just an alternative word for voltage.
11. State all units and rearrange in all ways for the equation in question 10. How can this equation be used to calculate fuse values?
12. Write down an equation that links energy transferred, current, voltage and time. Rearrange the equation in all ways and state the units and symbols for each one.
13. What is the difference between a.c. electricity and d.c. electricity? Which is supplied by a cell or battery and which is supplied by the mains electricity?