Q110 / 160 · JIPMER 2007 · Physics

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
    $0.4 \Omega$
  • Correct answer
    D
    $0.04 \Omega$

Solution

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

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

Relevant Questions