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प्रश्न
Name the energy transfers which occur when an electric ball rings.
Name the energy conversion that takes place when an electric bell rings.
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उत्तर
An electric bell converts electrical energy to sound energy.
संबंधित प्रश्न
A ball is placed on a compressed spring. What form of energy does the spring possess? On releasing the spring, the ball flies away. Give a reason.
A ball of mass 0.20 kg is thrown vertically upwards with an initial velocity of 20 m s-1. Calculate the maximum potential energy it gains as it goes up.
A stone of mass 500 g is thrown vertically upwards with a velocity of 15 m/s. Calculate:
- the potential energy at the greatest height,
- the kinetic energy on reaching the ground, and
- the total energy at its half-way point.
State whether the object possess kinetic energy, potential energy, or both :
A flying aeroplane _______________.
State whether the object possess kinetic energy, potential energy, or both :
A stretched spring lying on the ground ____________.
What kind of energy is possessed by the following?
Water stored in the reservoir of a dam __________.
Fill in the blank with suitable word :
The ability of a body to do work is called __________. The ability of a body to do work because of its motion is called __________.
A boy weighing 40 kg makes a high jump of 1.5 m.
What is his kinetic energy at the highest point?
Define the term 'energy' of a body. What is the SI unit of energy.
Name the device or machine which convert :
Mechanical energy into electrical energy.
Name the device or machine which convert :
Electrical energy into heat energy.
Name the device or machine which convert :
Heat energy into kinetic energy (or mechanical energy).
Name the device or machine which convert :
Chemical energy into kinetic energy (or mechanical energy).
Write the energy transformations which take place in an electric bulb (or electric lamp).
A bulb lights up when connected to a battery. State the energy change which takes place :
Name the energy transfers which occur when there is a picture on a television screen.
Which one of the following is not the unit of energy?
A body of mass 10 kg falls from a height of 20 m to 8 m. Calculate:
- the loss in potential energy of the body, and
- the total energy possessed by the body at any instant? (Take g = 10 m s-2)
