A $8$ W carbon resistor is color coded with $Y e l l o w B l a c k B r o w n G o l d$ in the same order from left to right, then maximum current which can be passed through resistor is

0.14 A

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0.28 A

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0.56 A

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0.32 A

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Solution

The correct option is A $0.14 A$
Using given information regarding resistor,
( $Y e l l o w B l a c k B r o w n G o l d$ ) $= (40 \times 10^{1} \pm 5 %$ ) $Ω$

$P = R i^{2} S o, i^{2} = \frac{P}{R} = \frac{8}{400} (a p p r o x)$
$i = \frac{2 \sqrt{2}}{20} = \frac{2 \times 1.4}{20} = 0.14 A$

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