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प्रश्न
Name the energy transfers which occur when a torch is on.
Name the energy conversion that takes place when a torch is on.
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उत्तर
A torch converts the electrical energy of the battery into light and heat energy.
संबंधित प्रश्न
Does the transfer of energy take place when you push a huge rock with all your might and fail to move it? Where is the energy you spend going?
A metal ball of mass 2 kg is allowed to fall freely from rest from a height of 5 m above the ground. Taking g = 10 m s−2, calculate:
- the potential energy possessed by the ball when it is initially at rest.
- the kinetic energy of the ball just before it hits the ground?
State whether the object possess kinetic energy, potential energy, or both :
A stretched spring lying on the ground ____________.
What are the various forms of energy?
Water stored in a dam possesses ______.
A stone is thrown upwards as shown in the diagram. When it reaches P, which of the following has the greatest value of the stone?
Name the device which converts electrical energy into mechanical energy.
Name the device or machine which convert :
Chemical energy into electrical energy.
Name the device or machine which convert :
Light energy into electrical energy.
Name the device or machine which convert :
Chemical energy into kinetic energy (or mechanical energy).
Name the device or machine which convert :
Chemical energy into heat energy.
Fill in the blanks with suitable words:
When a ball is thrown upwards, ___________ energy is transformed into ___________ energy.
What kind of energy transformations take place at a coal-based thermal power station?
Five electric fans of 120 watts each are used for 4 hours. Calculate the electrical energy consumed in kilowatt-hours.
What is the meaning of the symbol kWh? What quantity does it represent?
An object is falling freely from a height x. After it has fallen a height `pi/2` , it will possess :
How much energy does a 100 W electric bulb transfer in 1 minute?
In the case of negative work, the angle between the force and displacement is
A girl with having a mass of 35 kg sits on a trolley of mass 5 kg. The trolley is given an initial velocity of 4 m s–1 by applying a force. The trolley comes to rest after traversing a distance of 16 m. (a) How much work is done on the trolley? (b) How much work is done by the girl?
A body of mass 10 kg at rest is acted upon simultaneously by two forces 4 N and 3 N at right angles to each other. The kinetic energy of the body at the end of 10 s is
