A 3-pin mains plug is fitted to the cable for a 1 kW electric kettle to be used on a 250 V a.c. supply. Which of the following statements is not correct?
(a) The fuse should be fitted in the live wire
(b) A 13 A fuse is the most appropriate value to use
(c) The neutral wire is coloured black
(d) The green wire should be connected to the earth pin.

Academic Physics NCERT Class 10

(b) A 13 A fuse is the most appropriate value to use.

Explanation

Given:

Power, P = 1 kW = 1000 W

Potential difference, V = 250 V

We know that,

$Current(I)=\frac{Power(P)}{PotentialDifference(V)}$

$I=\frac{1000}{250}$

$I=4A (ampere)$

We should use a fuse with a current capacity slightly greater than the maximum current drawn by the device. Thus, the current drawn here is 4A, then the fuse of 13A may not be considered the most suitable as it is not a slightly high value but very high.

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Updated on: 10-Oct-2022

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