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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
Name the type of energy (kinetic energy K or potential energy U) possessed in the given case:
An arrow shot out of a bow.
State the energy changes in the following case while in use:
an electric cell in a circuit
Name three non-renewable sources of energy.
MULTIPLE CHOICE TYPE:
The ultimate source of energy is:
(a) wood
(b) wind
(c) water
(d) sun
State the energy changes which take place when:
A body thrown vertically upwards from the ground.
State the energy changes which take place when:
An air gun is loaded and then fired.
Give one example when:
Sound energy changes to electric energy.
Give one example when:
Electric energy changes to potential energy.
Give one example when:
Chemical energy to electrical energy.
Energy from various sources is considered to have been derived from the sun. Do you agree? Justify your answer.
