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प्रश्न
Name the device or machine which convert :
Mechanical energy into electrical energy.
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उत्तर
An electric generator converts mechanical energy into electrical energy.
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संबंधित प्रश्न
A body falls freely under gravity from rest. Name the kind of energy it will possess while falling.
Show that the sum of kinetic energy and potential energy (i.e., total mechanical energy) is always conserved in the case of a freely falling body under gravity (with air resistance neglected) from a height h by finding it when
- The body is at the top.
- the body has fallen a distance x.
- the body has reached the ground.
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?
What type of energy is possessed : by the piece of stone which is thrown away on releasing the stretched rubber strings of catapult?
What are the various forms of energy?
Name the device or machine which convert :
Electrical energy into light energy.
How much electric energy in kWh is consumed by an electrical appliance of 1000 watts when it is switched on for 60 minutes?
Name the energy transfers which occur when a torch is on.
A microphone converts :
In the case of negative work, the angle between the force and displacement is
