## Mains Electricity

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- Write down a few domestic appliances.
- What does wire insulation prevent?
- Explain what is meant by double insulation.
- Draw the symbol for double insulation?
- How does Earthing an appliance work?
- What is a fuse and how does it work?
- Draw the symbol for a fuse.
- Explain how a circuit breaker works.
- What happens to a resistor when a current flows through it? How can this be put to use?
- Write down an equation to calculate electrical power using current and potential voltage. Remember that potential difference is just an alternative word for voltage.
- State all units and rearrange in all ways for the equation in question 10. How can this equation be used to calculate fuse values?
- 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.
- 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?