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प्रश्न
Name the device or machine which convert :
Light energy into electrical energy.
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उत्तर
A solar cell converts light energy into electrical energy.
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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.
Fill in the blank with suitable word :
The sum of the potential and kinetic energies of a body is called __________ energy.
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.
Fill in the blanks with suitable words :
The principle of ___________ of energy says energy can be transformed from one form to another, but it cannot be ___________ or ___________.
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 second?
Describe the energy changes which take place in a radio.
What do you understand by the term 'transformation of energy"? Explain with an example.
Name the energy transfers which occur when an electric ball rings.
Which one of the following is not the unit of energy?
