Q125 / 160 · JIPMER 2013 · Physics

A 5 amp 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
    $0.4 \Omega$
  • Correct answer
    D
    $0.04 \Omega$

Solution

Power $P=i^2 R$ $\Rightarrow \quad R=\frac{P}{i^2}$ given, $P=1 \mathrm{~W}$, and $i=5 \mathrm{~A}$ $\therefore \quad R=\frac{1}{(5)^2}=0.04 \Omega$

Hence, the correct answer is option: 'D'.

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