Domestic Uses & Safety — GCSE Physics Revision
Revise Domestic Uses & Safety for GCSE Physics. Step-by-step explanation, worked examples, common mistakes and exam-style practice aligned to AQA, Edexcel, OCR, WJEC, Eduqas, CCEA, Cambridge International (CIE), SQA, IB, AP.
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Go to Energy Transfers in CircuitsWhat is Domestic Uses & Safety?
Domestic electricity in the UK is an AC (alternating current) supply at approximately 230V and a frequency of 50Hz. Electrical safety in the home is crucial and is ensured through features like fuses, circuit breakers, and earth wires. These devices are designed to prevent electric shocks and fires by interrupting the circuit if a fault occurs.
Board notes: Essential knowledge for all GCSE Physics boards (AQA, Edexcel, OCR). Specific details about plug wiring and safety features are common exam questions.
Step-by-step explanationWorked example
An appliance has a power rating of 1.15kW and is connected to the 230V mains. What is the current and which fuse should be used (3A, 5A, or 13A)? Solution: Current I = P/V = 1150W / 230V = 5A. You should use the next fuse rating up, which is a 13A fuse, to allow for surges on startup but still protect the appliance.
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Common mistakes
- 1Confusing direct current (DC) and alternating current (AC). DC flows in one direction only (e.g., from a battery), while AC repeatedly changes direction (e.g., mains electricity).
- 2Not understanding the function of the earth wire. The earth wire is a safety feature that provides a path for current to flow to the ground if a fault causes the metal casing of an appliance to become live.
- 3Mixing up the roles of fuses and circuit breakers. Both interrupt the circuit in case of a current surge, but fuses are single-use and melt, while circuit breakers are switches that can be reset.
Domestic Uses & Safety exam questions
Exam-style questions for Domestic Uses & Safety with mark-scheme style solutions and timing practice. Aligned to AQA, Edexcel, OCR, WJEC, Eduqas, CCEA, Cambridge International (CIE), SQA, IB, AP specifications.
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Step-by-step method
Step-by-step explanation
4 steps · Worked method for Domestic Uses & Safety
Core concept
Domestic electricity in the UK is an AC (alternating current) supply at approximately 230V and a frequency of 50Hz. Electrical safety in the home is crucial and is ensured through features like fuses,…
Frequently asked questions
What are the three wires in a plug?
A standard UK plug has a live wire (brown), a neutral wire (blue), and an earth wire (green and yellow stripes).
Why can you get an electric shock?
You can get an electric shock if you touch a live wire, as your body provides a path for the current to flow to the earth. The severity depends on the voltage and the path the current takes through your body.