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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
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 man climbing a hill _____________.
What kind of energy is possessed by the following?
A stone kept on roof-top _______________
What kind of energy is possessed by the following?
Water stored in the reservoir of a dam __________.
Name the device or machine which convert :
Chemical energy into electrical energy.
Name the device or machine which convert :
Electrical energy into sound energy.
Name the device or machine which convert :
Chemical energy into kinetic energy (or mechanical energy).
Name the device or machine which convert :
light energy into heat energy.
What kind of energy transformation take place at a hydroelectric power station?
How much electrical energy in joules does a 100 watt lamp consume : in 1 minute?
Explain the transformation of energy in the following cases :
(i) A ball thrown upwards.
(ii) A stone dropped from the roof of a building.
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?
Name the energy transfers which occur when there is a picture on a television screen.
Name the energy transfers which occur when a torch is on.
A girl is carrying a school bag of 3 kg mass on her back and moves 200 m on a levelled road. The work done against the gravitational force will be (g = 10 m s–2)
An automobile engine propels a 1000 kg car (A) along a levelled road at a speed of 36 km h–1. Find the power if the opposing frictional force is 100 N. Now, suppose after travelling a distance of 200 m, this car collides with another stationary car (B) of the same mass and comes to rest. Let its engine also stop at the same time. Now the car (B) starts moving on the same level road without getting its engine started. Find the speed of the car (B) just after the collision.
