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Question

Question 28 (iii)
B1, B2 and B3 are three identical bulbs connected as shown in Figure. When all the three bulbs glow, a current of 3A is recorded by the ammeter A.
(iii) How much power is dissipated in the circuit when all the three bulbs glow together?

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Solution

(iii) When all the three bulbs are connected,
Power dissipated, P=VI

The value of V= 4.5 V since all the bulbs are connected in parallel.
Therefore, P=VI=4.5×3 =13.5 W

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