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JIPMER 2013
Exam
JIPMER
Year
2013
Subject
Physics
Chapter
Current Electricity

JIPMER 2013 · Physics · Current Electricity

A 5 amp fuse wire can withstand a maximum power of 1 W in circuit....

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

Options

  1. A0.2Ω0.2 \Omega
  2. B5Ω5 \Omega
  3. C0.4Ω0.4 \Omega
  4. D0.04Ω0.04 \Omega

Correct answer

D. 0.04Ω0.04 \Omega

Step-by-step solution

Power P=i2RP=i^2 R ⇒R=Pi2\Rightarrow \quad R=\frac{P}{i^2} given, P=1 WP=1 \mathrm{~W}, and i=5 Ai=5 \mathrm{~A} ∴R=1(5)2=0.04Ω\therefore \quad R=\frac{1}{(5)^2}=0.04 \Omega
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