Domestic uses and safety — WJEC GCSE Physics
In summary: Domestic uses and safety is a key topic in WJEC GCSE Physics. Key exam tip: Always remember that the live wire carries the alternating potential from the supply
Exam Tips for Domestic uses and safety
- Always remember that the live wire carries the alternating potential from the supply
- Be prepared to explain why the earth wire is a safety feature
- Ensure you can distinguish between the roles of the three wires in a standard UK plug
Common Mistakes
- Confusing the potential difference of the live wire with the neutral wire
- Failing to identify that the live wire remains dangerous when a switch is open
- Incorrectly calculating the required fuse rating by failing to consider the power and voltage of the appliance
Marking Points
- UK domestic supply is a.c. at 50 Hz and 230 V
- Difference between direct and alternating voltage
- Functions of live, neutral, and earth wires
- Danger of live wire even when switch is open
- Dangers of connection between live wire and earth
- Function of a fuse
- Calculation of appropriate fuse rating for an appliance
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