Home
Class 10
PHYSICS
Three incandescent bulbs of 100 W each a...

Three incandescent bulbs of 100 W each are connected in series in an electrical circuit. In another circuit another set of three bulbs of the same wattage are connected in parallel to the same source.
(a) Will the bulb 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.

Text Solution

Verified by Experts

(a) No.
Reasons:Let R be the resistance of each bulb, then total resistance in series = 3R
In series, current in each bulb is same.
So current drawn by each bulb connected in series is one-third as compared to the current in each bulb in parallel arrangement, so the bulbs connected in parallel combination glow more brightly.
(b) In series arrangement, if one bulb is fused, then current in the bulbs connected in series will become zero, so bulbs will stop glowing. In parallel arrangement, if one bulb is fused, the other two bulbs will continue to glow with same brightness.
Promotional Banner

Topper's Solved these Questions

  • ELECTRICITY

    VK GLOBAL PUBLICATION|Exercise LONG ANSWER QUESTIONS|4 Videos

  • ELECTRICITY

    VK GLOBAL PUBLICATION|Exercise NUMERICALS |2 Videos

  • ELECTRICITY

    VK GLOBAL PUBLICATION|Exercise SHORT ANSWER QUESTION-I|8 Videos

  • LIGHT-REFLECTION AND REFRACTION

    VK GLOBAL PUBLICATION|Exercise PROFICIENCY EXERCISE (Long Answer Questions)|5 Videos

Similar Questions

Explore conceptually related problems

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 incandescent 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 circuits get fused. Will the rest of the bulbs continue to glow in each circuit ? Give reason. (a) In a household electric circuits, different appliances are connected in parallel to one another. Give two reasons for the same. (b) An electrican puts a fuse of rating 5 A in that part of domestic electrical circuit in which electrical heater of rating 1.5 kW, 220 V is operating. What iis likely to happen in this case and why ? What change, if any, needs to be made ?

Three electric bulbs of rating 60 W each are joined in series and then connected to electric mains. The power consumed by these three bulbs will be

Two electric bulbs A and B are rated as 60 W and 100 W . They are connected in parallel to the same source. Then,

Three bulbs of 40, 60 and 100 watt are connected in series with the source of 200 volt. Then which of the bulb will be glowing the most –

Two electric bulbs A and B are rated 60 and 100 W , respectively. If they are connected in parallel to the same source , then

In which case, bulb glows in the circuit.

In an electrical circuit three incandescent bulbs A,B and C of rating 40 W, 60 W and 100 W respectively are connected in parallel to an electric source. Which of the following is likely to happen regarding their brightness ?