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Electric Current: Flow of Electrons in Circuit

Three bulbs A...

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Question 3

Three bulbs A, B, C are connected in a circuit as shown in Figure. When the switch is ‘ON’

(a) bulb C will glow first

(b) bulb B and C will glow simultaneously and bulb A will glow after some time

(c) all the bulbs A,B and C will glow at the same time

(d) the bulbs will glow in the order A, B and C

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Solution

As soon as the circuit is complete, All the bulbs will glow simultaneously because there is no time lag in the flow of current.

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Question 5

In the circuit shown below, when the switch is moved to ‘ON’ position,

(a) the bulb A will glow first.

(b) the bulb B will glow first.

(c) the bulb C will glow first.

(d) all bulbs will glow together.

Two bulbs are marked as ‘A’ having rating 60W, 220V & ‘B’ having rating 100W, 220V. They are connected in parallel to a 220 V source. Which of the two will glow brighter?

Two bulbs A & B rated [200V, 50W] and [200V; 100W] are connected in series. Which will glow brighter?

Q. Question 28 (iii)

B_{1}, B_{2}

B_{3}

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?

Q. Question 28 (i)

B_{1}, B_{2}, a n d B_{3}

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.
(i) What happens to the glow of the other two bulbs when the bulb

B_{1}

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Electric Current: Flow of Electrons in Circuit

Standard VII Physics

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