In our homes, we receive the supply of electric power through a main supply also called mains, either supported through overhead electric poles or by underground cables. In our country the potential difference between the two wires (live wire and neutral wire) of this supply is 220 V.
Read the passage carefully and answer the questions that follow.
Generated by claude-sonnet-4-6 · 2026-06-15 06:43 · grounding stimulus
I notice that sub-question (c) appears to be incomplete — its actual question text is missing. I will answer (a) and (b) fully, and note the issue for (c).
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Model Answer
(a) The live wire has a red insulation cover and the neutral wire has a black insulation cover. (The earth wire has a green insulation cover.)
(b)
$$I = \frac{P}{V} = \frac{1000 \text{ W}}{220 \text{ V}} \approx 4.5 \text{ A}$$
The current rating of the circuit should be at least 5 A.
(c) (The question text for sub-question (c) is missing/incomplete in the paper provided. Please supply the full question for a complete answer.)
Source: Chapter 12 – Electricity, Section: Domestic Electric Circuits
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Explanation
- (a) Examiners expect the standard wire colour codes: Live = Red, Neutral = Black, Earth = Green. Mentioning all three is safe even if only two are asked about.
- (b) Use P = VI → I = P/V. Always show the formula and substitution for full marks. Round up to the nearest standard fuse/circuit rating (5 A here).
- (c) Since the sub-question text is cut off, no answer can be given. Check your original paper and match the topic (likely about earthing, fuse, or short circuit) to standard textbook points.