Q

Confused! kindly explain, A 2 W carbon resistor is color-coded with green, black, red and brown respectively. The maximum current which can be passed through this resistor is :

A 2 W carbon resistor is color-coded with green, black, red and brown respectively. The maximum current which can be passed through this resistor is :

• Option 1)

20 mA

• Option 2)

100 mA

• Option 3)

0.4 mA

• Option 4)

63 mA

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To remember the sequence of colour code -

B B ROY Great Britain Very Good Wife

- wherein

$power =2W$

colour code $\rightarrow$ green black red brown

$P=I^{2}R\\\\: for \: I_{max }\: \: \: R \: should\: be\: minimum\: from\: \: colour \\\\R_{min}=50\times 10^{2}\Omega$

$I_{max}=\sqrt{\frac{P}{R}}=\sqrt{\frac{2}{50\times 10^{2}}}$

$=2\times 10^{-2}A$

$I_{max}=20MA$

Option 1)

20 mA

Option 2)

100 mA

Option 3)

0.4 mA

Option 4)

63 mA

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