Question

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

Answer 1

Answer:

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

The value of R(21/4)Ω

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

Power dissipated in R21W

Answer :

B

Solution :

(b) Fro normal brightness of each bulb see following circuit. Current through each bulb =0.5A

i=2A

=1.5V

=10.5V

V=iR⇒10.5=×R=R=214Ω

Explanation:

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