Advertisements
Advertisements
प्रश्न
If an electric bulb of 100 watt is lighted for 2 hours, how much electric energy would be consumed?
उत्तर
Given power= 100 watt, time = 2hrs
Energy consumed = power x time
= 100 x 2 x 60 x 60
= 7.2 x 105 J
APPEARS IN
संबंधित प्रश्न
Why is a jack screw provided with a long arm?
State the S.I. unit of work and define it.
State two advantage of producing hydroelectricity.
State the law of conservation of energy.
Explain by an example that a body may possess energy even when it is not in motion.
A force of 50 N acts on a body and moves it a distance of 4 m on horizontal surface. Calculate the work done if the direction of force is at an angle of 60° to the horizontal surface.
Give two examples of work done.
Distinguish between work and power.
Give an example
Light energy changes to electrical energy.
How much energy is gained by a box of mass 20 kg when a man, runs carrying the box with a speed of 3 m/s-1 to catch the bus?
Name the material commonly used for the manufacturing of solar cells.
A girl of mass 40 kg runs a height of 80 stairs, each 25 cm high with a load of 20 kg on her head in 25 sec. If g is 10 m/s2, find:
(i) Gravitational force acting on the girl.
(ii) Work done by her.
(iii) Useful work done by her.
(iv) Her power in watt.
A bucketful of water is to be drawn from a well ______ will be done when a ______ is applied to do this because there will be a ______ of water.
(displacement, work, force)
