Solar Cell
Solar Cell
Solar Cells:
A device which converts solar energy directly into electricity is called a solar cell or a photovoltaic (PV) cell. Some substances like silicon are semiconductors. Their ability to conduct electricity is much less than that of conductors. However, when certain substances are added to semiconductors, they are able to conduct electricity much better. Solar cells are made from such altered semiconductors.
When sunlight falls on a solar cell, a potential difference of about 0.5-1 V develops across it. The power of a solar cell depends on its surface area. The greater the surface area of the solar cell, the greater is the solar energy collected by it, and hence, the greater is the power generated. Small solar cells are, therefore suitable for use in only those electronic devices that require very little power. Such devices include-calculators and watches. A typical solar cell delivers much less power than a common dry cell.
Advantages of Solar Cells:
The advantages of solar cell are
(a) Solar cells are suitable for use in remote areas where electrical power lines have not reached.
(b) Solar cells require little maintenance and last for a long time.
Limitations of generating electricity from solar cells :
(a) Solar panels are expensive. Although silicon is the second-most abundant element on earth, the cost of purifying silicon for making semiconductors used in solar cells is very high. This increases the cost of solar cells.
(b) The solar cells in a solar panel are connected using silver, to keep the resistance as low as possible. This also increases the cost.
A solar panel is made by combining a large number of | |||
| Right Option : B | |||
| View Explanation | |||
Which of the following are correct ? (a) A typical solar cell delivers much less power than a common dry cell. (b) Solar cells are environment friendly, as they do not cause any pollution. (c) Solar cells provide direct current while most household appliances work on AC. Special devices are needed to convert the DC to AC. | |||
| Right Option : D | |||
| View Explanation |
The solar cell panels ________ | |||
| Right Option : D | |||
| View Explanation | |||
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