Science (086) — AI-generated practice question

Overloading occurs when too many appliances are connected to a single circuit or there is an accidental rise in supply voltage, causing excessive current flow.

Short-circuiting occurs when the live wire and neutral wire come into direct contact (due to damaged insulation or a fault), causing current to increase abruptly.

Yes, the same fuse can blow in both situations. In both cases, the current in the circuit rises beyond the fuse's rated value. The excessive Joule heating melts the fuse wire, breaking the circuit and protecting the appliances.

Source: Chapter 12, Section 12.4 — Domestic Electric Circuits

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• Examiners expect two distinct definitions (1 mark each) and a justified yes/no for the fuse question (1 mark).
• Key link: both overloading and short-circuiting raise current above safe limits → fuse melts due to Joule heating. Mentioning Joule heating strengthens the justification.
• Don't confuse the two: overloading is gradual/excessive load; short-circuit is a direct wire-to-wire fault causing sudden surge.