CameraIcon

SearchIcon

MyQuestionIcon

1

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

Power Delivered and Heat Dissipated in a Circuit

A light bulb ...

Question

A light bulb is rated at 125 W for a 250 V a.c., supply.
Calculate the resistance of the bulb.

Open in App

Solution

Power of the bulb, P = 125 W
Voltage, V = 250 V
The resistance of the bulb is given by
$R = \frac{V^{2}}{P} = \frac{(250)^{2}}{125}$
$= 500 Ω$

Suggest Corrections

thumbs-up

6

Similar questions

Q. A light bulb is rated at

100 W

220 V

a.c supply. Calculate the resistance of the bulb.

Q. (a) For a given a.c.,

i = i_{m} s i n ω t

, show that the average power dissipated in a resistor R over a complete cycle is

\frac{1}{2} i_{m}^{2} R

(b) A light bulb is rated at 100 W for a 220 V a.c. supply
Calculate the resistance of the bulb

Q. A light bulb is rated at

100 W

220 V

supply. Find the resistance of the bulb:

Q. A light bulb is rated

100 W

220 V

50 H z

. Calculate
(i) The resistance of the bulb;
(ii) The rms current through the bulb.

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

Power Delivered and Heat Dissipated in a Circuit

PHYSICS

Watch in App

explore_more_icon

Explore more

Power Delivered and Heat Dissipated in a Circuit

Standard XII Physics

Join BYJU'S Learning Program

CrossIcon