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प्रश्न
Name the device or machine which convert :
light energy into heat energy.
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उत्तर
A solar water heater converts light energy into heat energy.
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संबंधित प्रश्न
In what way does the temperature of water at the bottom of a waterfall differ from the temperature at the top? Explain the reason.
A ball of mass 0.20 kg is thrown vertically upwards with an initial velocity of 20 m s-1. Calculate the maximum potential energy it gains as it goes up.
A metal ball of mass 2 kg is allowed to fall freely from rest from a height of 5 m above the ground. Taking g = 10 m s−2, calculate:
- the potential energy possessed by the ball when it is initially at rest.
- the kinetic energy of the ball just before it hits the ground?
What are the various forms of energy?
Name the device or machine which convert :
Chemical energy into heat energy.
Five electric fans of 120 watts each are used for 4 hours. Calculate the electrical energy consumed in kilowatt-hours.
A bulb lights up when connected to a battery. State the energy change which takes place :
What do you understand by the term 'transformation of energy"? Explain with an example.
Name the energy transfers which occur when a torch is on.
A ball falls to the ground as shown below :
Which law you have made use of in answering this question?
