First slide

Electrical power

Question

A 5-A fuse wire can withstand a maximum power of 1 W in circuit. The resistance of the fuse wire is

Easy

A

$0.2 Ω$
B

$5 Ω$
C

$0.4 Ω$
D

$0.04 Ω$

Solution

Power, P = i² R
$\Rightarrow R = \frac{P}{i^{2}}$
Given, P = 1 W, i = 5 A
$∴ R = \frac{1}{{(5)}^{2}} = 0 .04 Ω$

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