Current Electricity - Result Question 72

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

[2005]

(a) $0.04 ohm$

(b) $0.2 ohm$

(c) $5 ohm$

(d) $0.4 ohm$

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Answer:

Correct Answer: 77. (a)

Solution:

  1. (a) $R=\frac{P}{I^{2}}=\frac{1}{25}=0.04 \Omega$