Generated by claude-sonnet-4-6 · 2026-06-15 06:47 · grounding rag
Model Answer
(a) These gadgets should be connected in parallel with the mains. Three reasons:
- Each appliance gets the same voltage (220 V) as required for proper functioning.
- If one appliance is switched off, others continue to work independently.
- The total resistance decreases in parallel, allowing each device to draw the required current without affecting others.
(b) An electric fuse is a safety device made of a thin wire of low melting point alloy (e.g., tin-lead) that melts and breaks the circuit when excess current flows, preventing damage to appliances.
It is always connected in series with the live wire of the circuit.
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Explanation
- For part (a), the three reasons — same voltage, independent operation, and individual switching — are standard CBSE expected points. Any three valid reasons score full marks.
- For part (b), examiners look for: definition mentioning low melting point, its protective function, and that it is connected in series. Missing "series" is a common mistake and will cost marks.
- The question is 3 marks total, so keep answers brief and to the point.