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Home » A 3-pin mains plug is fitted to the cable for a 1kW electric kettle to be used on a 250V a.c supply. Which of the following statement is not correct? a) the fuse should be fitted in the live wire b) a 13A 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
A 3-pin mains plug is fitted to the cable for a 1kW electric kettle to be used on a 250V a.c supply. Which of the following statement is not correct? a) the fuse should be fitted in the live wire b) a 13A 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
CBSE | Class 10 | Lakhmir Singh | Magnetic Effects of Electric Current | Physics
A 3-pin mains plug is fitted to the cable for a 1kW electric kettle to be used on a 250V a.c supply. Which of the following statement is not correct? a) the fuse should be fitted in the live wire b) a 13A 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

Answer:

The correct option is b) a 13A fuse is the most appropriate value to use

Explanation:

Describing the relationship between the fuse rating and the fuse rating.

FR=1.25×PV
F R=1.25 \times \frac{P}{V}

Here, F R is the fuse rating P is the power, and V is the voltage. Substitute 1 K W for P and 250 V for V to find the fuse rating.

    \[\begin{aligned} &F R=1.25 \frac{1 K W \times \frac{1000 W}{1 K W}}{250 V} \\ &F R=5 A \end{aligned}\]

Therefore, the fuse rating is 5 A.
Thus, a 13 A fuse is the most appropriate value to use.

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