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ICSE Class 10 Physics Question 18 of 19

Household Circuits — Question 18

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Question 18

Which of the cables, one rated 5 A and the other rated 15 A will be of thicker wire? Give a reason for your answer.
[Hint :To carry heavy current, the resistance of wire should be low, so its area of cross section should be large].

Answer

The thicker wire is the one which is rated 15 A.
In order to carry heavy current, the resistance of wire should be low, so it's area of cross section should be large. Therefore, as large current is passing through the second wire hence, it will be thicker.