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प्रश्न
What is a solar cell?
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
What is geothermal energy?
What is nuclear energy?
Name three non-renewable sources of energy.
State two disadvantages of using nuclear energy for producing electricity.
Write the type of energy possessed in the following case:
A moving cricket ball.
State the energy changes which take place when:
A body released from rest from the top of a building.
State the energy changes which take place when:
A body thrown vertically upwards from the ground.
State the energy changes which take place when:
Electricity obtained from nuclear energy.
Give one example when:
Kinetic energy to potential energy.
Draw a diagram to show the energy changes in an oscillating simple pendulum. Indicate in your diagram how the total mechanical energy in it remains constant during the oscillation.
