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

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

AIPMTAIPMT 2005Current Electricity

Solution:

$P=i^2 R$
$1 = 25 \times R$
$R=\frac{1}{25}=0.04\, \Omega$