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प्रश्न
Name the energy transfers which occur when there is a picture on a television screen.
Name the energy conversion that takes place when there is a picture on a television screen.
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उत्तर
A television screen converts electrical energy into light energy and heat 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.
State whether the object possess kinetic energy, potential energy, or both :
A man climbing a hill _____________.
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 bird running on the ground ____________.
State whether the object possess kinetic energy, potential energy, or both :
A stretched spring lying on 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?
Two bodies having equal masses are moving with uniform speeds of v and 2v respectively. Find the ratio of their kinetic energies.
A ball of mass 0.5 kg slows down from a speed of 5 m/s so that of 3 m/s. Calculate the change in kinetic energy of the ball. State your answer giving proper units.
Water stored in a dam possesses ______.
Name the device or machine which convert :
Chemical energy into heat energy.
Fill in the blank with suitable word:
The electricity meter installed in our homes measure electrical energy in the units of ___________.
Describe the energy changes which take place in a radio.
A bulb lights up when connected to a battery. State the energy change which takes place :
What is the meaning of the symbol kWh? What quantity does it represent?
Name the energy transfers which occur when an electric ball rings.
Name the energy transfers which occur when a torch is on.
A ball falls to the ground as shown below :
What is the potential energy of ball at B?
Which of the following energy change involves frictional force?
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.
