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Why an earth wire is used

The same question, asked 3 times: 2024*, 2025*, 2026. Every wording below, oldest first.

Try each one first, then open its answer.

  1. Question 1

    2024

    32
    “Earth wire is a safety measure in domestic electric circuits.” Justify this statement explaining its role in case of accidental leakage of electric appliances.

  2. Question 2

    2025

    33
    (a) “The third wire of earth connection is very important in domestic electric appliances.” Justify this statement. (b) List two precautions to be taken to avoid the overloading of domestic electric circuits.

  3. Question 3

    2026

    39 (b)
    (i) Draw a schematic diagram of a domestic electric circuit which includes the following devices : (I) A fuse (II) A power meter (III) One light point (IV) A power plug (ii) Why is it necessary to connect an earth wire to the electrical appliances having metallic covers ?