Four identical electrical lamps are labelled | vedclass

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Question

For normal brightness of each bulb see following circuit. Current through each bulb $=$ $0.5\, A$

So main current $i = 2\,A$

Also, voltage acros

Vedclass · Accepted Answer

The value of $R$ for normal brightness of each lamp is $(21/4)$ $\Omega$

Vedclass · Answer

For normal brightness of each bulb see following circuit. Current through each bulb $=$ $0.5\, A$

So main current $i = 2\,A$

Also, voltage across the combination $ = 1.5\,V$

So voltage across the resistance $ = 10.5\,V$

Hence for resistance $V = i\,R$ $ \Rightarrow $  $10.5 = 2 	imes R$ $ \Rightarrow $ $R = \frac{{21}}{4}\,\Omega $

Four identical electrical lamps are labelled $1.5\,V$, $0.5\,A$ which describes the condition necessary for them to operate at normal brightness. A $12\,V$ battery of negligible internal resistance is connected to lamps as shown, then

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