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The wheels of the turbine spin the generator in a hydro power plant.

Which conversion of energy of water turns the wheels of the turbine?

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Important Questions on Work, Energy and Power

EASY
Science>Physics>Work, Energy and Power>Energy
In a simple Pendulum the displacement is equal to amplitude. Then kinetic energy will be
MEDIUM
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Name a machine that converts electrical energy into mechanical energy.

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The temperature of the water at the bottom of a water fall is higher than that of the water at the top, because :
HARD
Science>Physics>Work, Energy and Power>Energy

A spring of spring constant K= 4x103N/m is compressed by 2 cm, then determine the potential energy stored in spring. 

EASY
Science>Physics>Work, Energy and Power>Energy
An electric motor converts:
MEDIUM
Science>Physics>Work, Energy and Power>Energy
Two bodies A and B have masses in the ratio 5:1 and their kinetic energies are in the ratio 125:9. Find the ratio of their velocities.                                                                                                                                
EASY
Science>Physics>Work, Energy and Power>Energy
Describe in your words the law of conservation of energy.
HARD
Science>Physics>Work, Energy and Power>Energy
A block of 9 kg is moving with a velocity of 4 m/s on a frictionless surface. The block comes to rest by compressing the spring. If the spring constant is 4x104 N/kg, then find the compression in the spring.
HARD
Science>Physics>Work, Energy and Power>Energy
Name the device that converts electrical energy into mechanical energy. Draw its diagram and label the parts.
EASY
Science>Physics>Work, Energy and Power>Energy
Which device is used to convert mechanical energy into electrical energy? Draw a neat diagram and label the parts of this device.
EASY
Science>Physics>Work, Energy and Power>Energy

State an example of renewable resource.

EASY
Science>Physics>Work, Energy and Power>Energy
State the energy changes in the case of a ceiling fan while in use.
EASY
Science>Physics>Work, Energy and Power>Energy
Write in your words the definition of potential energy.
EASY
Science>Physics>Work, Energy and Power>Energy
A marble P of mass m lies at rest on the edge of a perfectly horizontal surface of a table of height h, as shown in the figure. A second identical marble Q having same mass moving at a speed u strikes it perfectly elastically. The speed acquired by marble P after the collision is (In an elastic collision, momentum as well as kinetic energy are conserved)
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Science>Physics>Work, Energy and Power>Energy
In any physical or chemical process, the total energy:
EASY
Science>Physics>Work, Energy and Power>Energy
An electric device which converts electric energy into mechanical energy is called
EASY
Science>Physics>Work, Energy and Power>Energy
State the energy changes in the case of an electric iron while in use.
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Science>Physics>Work, Energy and Power>Energy
What do you understand by the term 'transformation of energy'? Explain with an example.
MEDIUM
Science>Physics>Work, Energy and Power>Energy
State and explain the law of conservation of energy. Explain with an example.
EASY
Science>Physics>Work, Energy and Power>Energy

Name a device or gadget which converts: Heat energy to mechanical energy.