Home
Class 10
PHYSICS
If the wattage of each bulb is 1.5 W, ho...


If the wattage of each bulb is 1.5 W, how much reading will the ammeter A show when all the three bulbs glow simuteously.

A

1.0A

B

2A

C

1.5W

D

None of the above

Text Solution

Verified by Experts

The correct Answer is:
A

When the bulbs are in parallel, wattage will be added (4.5 W) and the ammeter reading would be,
`I=P//V=4.5/4.5=1A`
Promotional Banner

Similar Questions

Explore conceptually related problems

If the wattage of each bulb is 1.5 w , what will be the reading in the ammeter A when all the three bulbs glow simultaneously.

B_1,B_2 and B_3 are three identical bulbs connected as shown in (fig. 3.46). When all the three bulbs glow, a current of 3 A is recorded by the ammeter A . (i) What happens to the glow of the other two bulbs when the bulb B_1 gets fused ? (ii) What happens to the readings of A_1,A_2,A_3 and A when the bulb B_2 gets fused ? (iii) How much power is dissipated in the circuit when all the three bulbs glow together ? .

There 60 W , 120 V light bulbs are connected across a 120 V powe source. If resistance of each bulb does not change with current then find out total powe deliver to the three bulbs.

Three incandecent bulbs of 100 W each are connected in series in an electric circuit. In another circuit another set of three bulbs of the same wattage are connected in parallel to the same source. (a) Will the bulbs in the two circuits glow with the same brightness ? Justify your answer. (b) Now let one bulb in both the circuits get fused. Will the rest of the bulbs continue to glow in each circuit ? Give reason.

Three similar light bulbs are connected to a constant to a constant voltage dc supply as shown in Fig . 7.32 . Each bulb operates at normal brightness and the ammeter ( of negligible resistance) registers a steady current. The filament of one of the bulbs breaks. What happens to the ammeter reading and to the brightness of the remaining bulbs?

(a) How much current will an electric bulb draw from a 220 V source, if the resistance of the bulb filament is 1200 Omega ? (b) How much current will an electric heater draw from a 220 V source, if the resistance of the heater coil is 100 Omega ?

A torch bulb rated 4.5 W, 1.5 V is connected as shown in Fig. 7.35. The emf of the cell needed to make the bulb glow at full intensity is