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प्रश्न
What is a solar cell?
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उत्तर
A solar cell is an electrical device that converts light energy directly into electricity with the help of photovoltaic effect. Solar cells are usually made from semiconductors like silicon and gallium with some impurity added to it. When sunlight is made incident on a solar cell, a potential difference is produced between its surface, due to which a current flows in the circuit connected between the opposite faces of the semiconductor.
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संबंधित प्रश्न
Write true or false of the following statement.
There is always some loss of energy in conversion from one form of energy to another form, so the total energy is not conserved.
Give one relevant example for the following transformations of energy:
Chemical energy to heat energy.
A boy of mass m climbs up a staircase of vertical height h.
(a) What is the work done by the boy against the force of gravity?
(b) What would have been the work done if he uses a lift in climbing the same vertical height?
What is meant by the renewable and non-renewable sources of energy? Distinguish between them giving two examples of weach.
Give one disadvantage of using a solar cell.
What do you understand by the potential energy of the body?
State the energy changes which take place when:
A battery lighting up a bulb.
A body of mass 0.2 kg falls from a height of 10 m to a height of 6 m above the ground. Find the loss in potential energy taking place in the body. [g = 10ms−2]
Calculate the kinetic energy of a body of mass 0.1 kg. and momentum 40kg m/s.
