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CBSE Class 10 Answered

An electric heater draws a current of 10A from a 220V supply. What is the cost of using the heater for 5 hrs everyday for 30 days if the cost of 1unit is RS 5.20  
Asked by nishamiyan652 | 28 Jan, 2020, 11:30: AM
answered-by-expert Expert Answer
Electrical power drawn by heater = 220 V × 10 A = 2200 W = 2.2 kW
 
Energy consumed per month = 2.2 kW × 5 (hrs / day )× 30 ( days /month) =   330 kW-hr / month
 
cost of electrical energy = 330 × Rs. 5.20 = Rs. 1716
Answered by Thiyagarajan K | 28 Jan, 2020, 01:24: PM

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CBSE 10 - Physics
An object is kept at a distance of 15 cm from a (a) Convex mirror (b) Plane mirror The focal length of the convex mirror and the concave lens are 10 cm each. Draw the appropriate ray diagrams, showing the formation of image, in each of the three cases.
Asked by susrisangita792 | 02 Jun, 2023, 08:00: AM
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CBSE 10 - Physics
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Asked by susrisangita792 | 01 Jun, 2023, 06:25: PM
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CBSE 10 - Physics
can a convex mirror ever form a real image? If yes, under what condition?  
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CBSE 10 - Physics
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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?
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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?
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CBSE 10 - Physics
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CBSE 10 - Physics
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CBSE 10 - Physics
The power of convex lens of focal length 20 cm is
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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
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