A 5 A fuse wire can withstand a maximum power of 1 W in circ... | Physics | SolveeIt | Solveeit

Today, August 18

Question

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

A

0.2 $\Omega$

B

5 $\Omega$

C

0.4 $\Omega$

D

0.04 $\Omega$

Answer

0.04 $\Omega$

Explanation

Solution

Power $\hspace5mm P=i^2R$ $\Rightarrow \hspace5mm R= \frac {P}{i^2}$ Given, P = IW and i = 5A $\therefore \hspace5mm R=\frac {1}{(5)^2}=0.04 \Omega$