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प्रश्न
Name the energy transfers which occur when someone speaks into a microphone.
Name the energy conversion that takes place when someone speaks into a microphone.
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उत्तर
A microphone converts sound energy to electrical energy.
संबंधित प्रश्न
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.
Fill in the blank with suitable word :
The sum of the potential and kinetic energies of a body is called __________ energy.
A boy weighing 40 kg makes a high jump of 1.5 m.
What is his kinetic energy at the highest point?
Give two examples where a body possesses both, kinetic energy as well as potential energy.
What are the various forms of energy?
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 :
Heat energy into kinetic energy (or mechanical energy).
Fill in the blank with suitable word:
The electricity meter installed in our homes measure electrical energy in the units of ___________.
Fill in the blanks with suitable words:
When a ball is thrown upwards, ___________ energy is transformed into ___________ energy.
The hanging bob of a simple pendulum is displaced to one extreme position B and then released. It swings towards centre position A and then to the other extreme position C. In which position does the bob have :
(i) maximum potential energy?
(ii) maximum kinetic energy?
What is the meaning of the symbol kWh? What quantity does it represent?
How much electric energy in kWh is consumed by an electrical appliance of 1000 watts when it is switched on for 60 minutes?
A ball falls to the ground as shown below :
What is the kinetic energy of ball when it hits the ground?
When an object falls freely towards the earth, then its total energy :
Which of the following energy change involves frictional force?
A microphone converts :
In the case of negative work, the angle between the force and displacement is
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)
