Four identical electrical lamps are labelled 1.5V, 0.5A whi…

Physics Heating and Chemical Effect of Current Mix MCQ (Single Correct)

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

The value of R for normal brightness of each lamp is (3/4) Ω Ω

The value of R for normal brightness of each lamp is (21/4) Ω Ω

Total power dissipated in circuit when all lamps are normally bright is 24W

Power dissipated in R is 21W when all lamps are normally bright

Text Solution

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The correct answer is:

For normal brightness of each bulb see following circuit. Current through each bulb = 0.5 A

So main current

Also, voltage across the combination

So voltage across the resistance

Hence for resistance ⇒ ⇒ ⇒ ⇒

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