Ask a Doubt
Request a call back

Join NOW to get access to exclusive study material for best results

CBSE Class 10 Answered

Q. An electric Lamp is rated 220 V and 50 W. Find the power consumed when it is operated on 120 V.
Asked by Trisha Gupta | 10 Jun, 2021, 06:46: PM
answered-by-expert Expert Answer
Let us find out the resistance R of the bulb that has power rating 50W when it is operating in 220 V .
 
Power P = V2 / R  
 
where V is voltage and R is resitance 
 
Hence resistance R = V2 / P = ( 220 × 220 ) / 50 = 968 Ω
 
When this bulb is connected to 120 V , then  consumed power P is given as
 
P = ( 120 × 120 ) / 968 =  14.876 W
 

Answered by Thiyagarajan K | 10 Jun, 2021, 07:24: PM

Application Videos

Concept Videos

Multiple Choice Questions Practice Test Subjective Questions Webinar Subjective Questions Pre Board Assessment
Answered Unanswered My Questions My Answers
CBSE 10 - Physics
Very Short Answer Type Questions Name two mirrors used in this fair shop. Name the mirror in which the size of image is small.
Asked by susrisangita792 | 01 Jun, 2023, 06:25: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 10 - Physics
can a convex mirror ever form a real image? If yes, under what condition?  
Asked by supriyarakshit.npph | 31 May, 2023, 08:49: AM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 10 - Physics
what is refraction  
Asked by deepbhagat1090 | 13 May, 2023, 09:40: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 10 - Physics
the angle between an incident ray and the reflecting surface is 55°. what will be the total angle between the incident and reflected ray?
Asked by ruchipandey20071978 | 11 May, 2023, 06:53: AM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 10 - Physics
What are the values of the angle of incidence, and the angle of reflection for normal incidence on the plane mirror surface?
Asked by anuskakuhu | 21 Mar, 2023, 11:50: AM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 10 - Physics
Please answer ... The hydroelectric capacity of Koyna dam is ______ a) 2400 MW  b) 1960 MW  c) 1900 MW  d) 1961 MW 
Asked by Shiwani.Sawant | 20 Mar, 2023, 02:53: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 10 - Physics
Write the name of a small satellite made by a group of students from COEP (college of engineering, Pune) sent to space through ISRO in 2016.
Asked by Arun | 18 Mar, 2023, 09:13: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 10 - Physics
The power of convex lens of focal length 20 cm is
question image
Asked by varma.renu9481 | 17 Mar, 2023, 06:28: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 10 - Physics
a concave mirror has a radius of curvature of 0.4m. find the position and size of the image of an object placed 0.2m high and is placed 0.8m in front of a concave mirror.
Asked by priyanshdhiman2008 | 17 Mar, 2023, 09:17: AM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 10 - Physics
A student has focussed the image of an object of height 3 cm on a white screen using a concave mirror of focal length 12 cm. If the distance of the object from the mirror is 18 cm, find the values of the following: Distance of the image from the mirror;  Height of the image. Please answer these questions.
Asked by jayeshsah1995 | 04 Mar, 2023, 06:33: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
My Class Videos Tests ₹ Plans Ask a Doubt