Home
Class 12
PHYSICS
Two 100W bulbs one having the tungsten f...

Two 100W bulbs one having the tungsten filament and the other carbon filament are joined in series with a power supply. How will their brightness change as time passes on .

Text Solution

Verified by Experts

Initially both will glow equally bright because both have some resistance . But as time passes on , because of heat dissipation , temperature of filaments increases. The resistance of tungsten filament increases whereas that of carbon filament increases.At any instant , the current flowing through both bulbs will be same. Hence from the formula `P = l^(2) xx R ` , the power consumed by tungsten filament will be larger and hence their bulb will glow brighter.
Promotional Banner

Topper's Solved these Questions

  • CURRENT ELECTRICITY

    AAKASH INSTITUTE|Exercise Try Yourself|32 Videos

  • CURRENT ELECTRICITY

    AAKASH INSTITUTE|Exercise ASSIGNMENT(SECTION-A(OBJECTIVE TYPE QUESTIONS))|59 Videos

  • COMMUNICATION SYSTEMS

    AAKASH INSTITUTE|Exercise ASSIGNMENT SECTION D (Assertion-Reason)|10 Videos

  • DUAL NATURE OF RADIATION AND MATTER

    AAKASH INSTITUTE|Exercise ASSIGNMENT (SECTION-D)|10 Videos

Similar Questions

Explore conceptually related problems

Assertion : Two bulbs of same wattage, one having a carbon filament and the other having a metallic filament are connected in series. Metallic bulbs will glow more brightly than carbon filament bulb. Reason : Carbon is a semiconductor.

Two bulbs of same wattage, one having a carbon filament and the other having a metallic filament, are connected in series to the mains. Which one will glow more ?

Two bulbs of 100 W and 200 W working at 220 volt are joined in series with 220 volt supply. Total power consumed will be approximately.

Two bulbs one of 200 volts, 60 watts & the other of 200 volts, 100 watts are connected in series to a 200 volts supply. The power consumed will be

Two electric bulbs have tungsten filament of same length. If one of them gives 60 W and the other 100 W , then

200W and 100W bulbs, both meant for operation at 220V are connected in series to a 200V supply. The power consumed by them will be approximately :

n identical bulbs are connected in series and illuminated by a power supply . One of the bulbs gets fused. The fused bulb is removed , and the remaining bulbs are again illuminated by the same power supply. Find the fractional change in the illuminated of (a) all the bulbs and (b) one bulb.

Two bulbs one of 200 volts , 60 watts & the other of 200 volts , 100 watts are connected in series to a 200 volt supply . The power consumed will be Assume the light bulbs are rated for single connection to 120 V. With the mistaken connection , the power dissipated by each bulb is

Two bulbs having rating of 60 W, 220 V and 100 W, 220 V are joined (i) in series, (ii) in parallel. Which of the two will glow brighter in each case?

Two bulbs of rated power 60W and 100W same specified voltage 220 V are connected in series to a 440 V DC source