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Match the following Device Conversion of Energy (a) Windmill (i) Chemical Energy to electrical energy (b) Bulb (ii) Kinetic Energy to Electrical Energy (c) Electrical Cell (iii) Sound Energy to Electrical energy (d) Microphone (iv) Electrical Energy to Light Energy

Match the following Device Conversion of Energy (a) Windmill (i) Chemical Energy to electrical energy (b) Bulb (ii) Kinetic Energy to Electrical Energy (c) Electrical Cell (iii) Sound Energy to Electrical energy (d) Microphone (iv) Electrical Energy to Light Energy Correct Answer (a) - (ii), (b) - (iv), (c) - (i), (d) - (iii)

The correct answer is option 2.

Key Points

Concept:

Energy

  • The capacity of doing work is called energy. 
  • SI unit of energy is the joule. 
  • Various forms of energy are heat energy, light energy, nuclear energy, electrical energy, mechanical energy, etc. 
  • Energy can be converted from one form to another. 
  • This happens through various processes or using certain appliances. 
  • For example, when a bulb glows by electricity, electrical energy is converted into light energy. 

Explanation:

Windmill

  • A windmill has large blades just as a fan. 
  • It wind rotates the blades attached to the turbine. 
  • The turbine rotates and electrical energy is produced. 
  • Energy to the motion is kinetic energy. 
  • So, the windmill converts the kinetic energy of blades into electrical energy. 

Electric cell

  • Chemical reactions take place in the cell. 
  • This makes a potential difference between the two terminals. 
  • When connected with the conductor, current flows. 
  • In this way, chemical energy is converted into electrical energy. 

Electric bulb

  • An electric bulb converts the electrical energy into light and heat energy. 
  • A filament present in the bulb burns and light energy is produced out of it. 

Microphone

  • A microphone receives the sound signal and converts it into electrical signals. 
  • In the microphone, there is a diaphragm. 
  • It vibrates and the diaphragm makes the coil attached to it vibrate. 
  • A permanent magnet near the coil induces a current in the coil by the process of electromagnetic induction. 
  • So, sound energy is converted into electrical energy.


Conclusion:

Device

Conversion of Energy

(a) Windmill
(ii) Kinetic Energy to Electrical Energy

(b) Bulb

(iv) Electrical Energy to Light Energy

(c) Electrical Cell

(i) Chemical Energy to electrical energy

(d) Microphone

(iii)   Sound Energy to Electrical energy 


The correct sequence is hence a) - (ii), (b) - (iv), (c) - (i), (d) - (iii)

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The human eye is a complex part of the body that is used for seeing. Eyes enable people to perform daily tasks and to learn about the world that surrounds them. Sight, or vision, is a rapidly occurring process that involves continuous interaction between the eye, the nervous system, and the brain. When someone looks at an object, what he really sees is the light reflected from the object. This reflected light passes through the lens and falls on the retina of the eye. Here the light induces nerve impulses that travel through the optic nerve to the brain and then over other nerves to muscles and glands.
The eye is similar to a television camera. Both the eye and the television camera convert light energy to electrical energy. The eye converts light to nerve impulses that are interpreted by the brain as the sense perception called sight. A television camera converts light to electronic signals that are broadcast and transformed into light images in a television receiver. It is wonderful that human eyes blink an average of once every six seconds. This washes the eye with the salty secretion from the tear or lachrymal glands. Each tear gland is about the size and shape of an almond. These glands are situated behind the upper eyelid at the outer corner of the eye. After passing over the eye, the liquid from the gland is drained into the nose through the tear duct at the inner corner of the eye. The average rate of blinking of an eye is
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The eye is similar to a television camera. Both the eye and the television camera convert light energy to electrical energy. The eye converts light to nerve impulses that are interpreted by the brain as the sense perception called sight. A television camera converts light to electronic signals that are broadcast and transformed into light images in a television receiver. It is wonderful that human eyes blink an average of once every six seconds. This washes the eye with the salty secretion from the tear or lachrymal glands. Each tear gland is about the size and shape of an almond. These glands are situated behind the upper eyelid at the outer corner of the eye. After passing over the eye, the liquid from the gland is drained into the nose through the tear duct at the inner corner of the eye. Lachrymal glands or tear glands are situated