MyQuestionIcon

1

You visited us 1 times! Enjoying our articles? Unlock Full Access!

Heating Effect of Current

An electric b...

Question

An electric bulb is marked 220 W and 250 V. if the supply voltage drops to 180 V. calculate the light and heat energy produced in 10 minutes

Open in App

Solution

P = V^2/R
If V = 250 V we have

220 W = 250^2/R
R = 250^2/220 Ω = 284.09Ω. This is the resistance of the bulb.

When V = 180 V, power consumed = V^2/R = 180^2/284.09= 114.04 W.

So energy is ( V^2/R)t = 114.0410*60 = 68424 J

Suggest Corrections

thumbs-up

0

Similar questions

Q. An electric bulb is marked 100 W, 230 V. If the supply voltage drops to 115 V, what is the heat and light energy produced by the bulb in 20 min?

Q. An electric bulb has a rating of 100 W, 200 V. If the supply voltage drops to 100 V, The total heat and light energy produced by the bulb in 20 minutes is

Q. An electric bulb is marked

100

230

V. If the supply voltage drops to

115

V, what will be the total heat and light energy, total liberated by the bulb in

20

Q. An electric heater of resistance

100 Ω

is connected to a main supply for 20 minutes. If 2A current flows through the filament of the heater, calculate the heat energy produced in the heater.

Q. An electric bulb is rated

^{'} 100 W, 250 V^{'}

. How much current will the bulb draw if connected to a

250 V

View More

Join BYJU'S Learning Program

similar_icon

Related Videos

lock

Heating Effect of Current_Tackle

PHYSICS

Watch in App

explore_more_icon

Explore more

Heating Effect of Current

Standard X Physics

Join BYJU'S Learning Program

CrossIcon