Question
What is a solar cell?
✓
Answer
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.
Need a full question paper?
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
Explore more
Similar questions
What is the principle of method of mixture (or principle of calorimetry)? Name the law on which
this principle is based.
this principle is based.
Draw a sketch showing the displacement of a body executing damped vibrations against time.
(a) Why is the base of a cooking pan generally made thick?
(b) Why does stone lying in the sum get heated up much more than water lying for the same duration of time?
(b) Why does stone lying in the sum get heated up much more than water lying for the same duration of time?
(a) Why is switch placed in the live wire?
(b) Name and define the standard commercial unit of electric energy.
(c) How many joules of energy are in one standard commercial unit of energy?
(b) Name and define the standard commercial unit of electric energy.
(c) How many joules of energy are in one standard commercial unit of energy?
Name a metal that is used as an electron emitter. Give one reason for using this metal.
The diagram shows a point source P inside a water container. Three rays A, B, and C starting from P are shown up to the water surface. Show in the diagram the path of these rays after striking the water surface. The critical angle for the water-air pair is 48°.
(a) State Ohm's law.
(b) What are the limitations of Ohm's law?
(b) What are the limitations of Ohm's law?
A block and tackle system has 5 pulleys. If an effort 0f 1000 N is needed in the downward direction to raise a load of 4500 N, calculate:
(a) the mechanical advantage
(b) the velocity ratio, and
(c) the efficiency of the system
(a) the mechanical advantage
(b) the velocity ratio, and
(c) the efficiency of the system
A uniform metre scale balances horizontally on a knife edge placed at 55 cm mark, when a mass of 25 g is supported from one end. Draw the diagram of the arrangement. Calculate mass of the scale.
How does the refractive index of a medium depend on its temperature?