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Some pairs of devices and associated energy changes are given below: i) Electric generator - Mechanical to electrical ii) Electric motor - Electrical to mechanical iii) Diesel engine - Light to electrical iv) Solar cell - Chemical to mechanical Which of the above pair / s is/are correctly matched?

Some pairs of devices and associated energy changes are given below: i) Electric generator - Mechanical to electrical ii) Electric motor - Electrical to mechanical iii) Diesel engine - Light to electrical iv) Solar cell - Chemical to mechanical Which of the above pair / s is/are correctly matched? Correct Answer i and ii

The correct answer is statement 1 and 2.

  • Electric generator - Mechanical to electrical
  • Electric motor - Electrical to mechanical

​Important Points

  • Electric Motor ➔ Fleming’s left-hand rule
  • Electric Generator ➔ Electromagnetic Induction ➔ Fleming’s right-hand rule

​Key Points

  • Electric Generator
    • ​Generators do not create electricity.
    • They use mechanical energy supplied to it to force the movement of electric charges present in the wire of its windings through an external electric circuit.
    • This flow of electrons constitutes the output electric current supplied by the generator. 
    • The modern-day generators work on the principle of electromagnetic induction discovered by Michael Faraday.
    • Thus an electric motor is a device that converts electrical energy into mechanical energy. 
  • Electric motors
    • A simple motor has a DC power source.
    • An electric motor is a rotating device that converts electrical energy to mechanical energy.
    • An electric motor consists of a rectangular coil of insulated metallic wire.
    • The coil is placed between the two poles of a magnetic field.
    • On supplying a magnetic field it rotates and produces mechanical energy.

Additional Information

  • The Diesel engine
    • The Diesel engine is an internal combustion engine.
    • In these engines, the fuel is injected into a combustion chamber.
    • On ignition by the high temperature of the air in the chamber, the air gets compressed.
    • Thus these engines only compress the air and not the fuel.
    • When injected into the combustion chamber, the Diesel fuel undergoes spontaneous ignition, which provides the force to accelerate the vehicles.
  • Solar cells or photovoltaic cells
    • Solar cells or photovoltaic cells are made based on the principle of the photovoltaic effect.
    • They convert sunlight into direct current (DC) electricity.

Related Questions

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1. Electric generator ⟺ Mechanical to electrical
2. Electric motor ⟺ Electrical to mechanical
3. Diesel engine ⟺ Light to electrical
4. Solar cell ⟺ Chemical to mechanical
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Read the following passage carefully and choose the most appropriate answer to the question out of the four alternatives.
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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. The eye is similar to the television camera because both
Read the following passage carefully and choose the most appropriate answer to the question out of the four alternatives.
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
Read the following passage carefully and choose the most appropriate answer to the question out of the four alternatives.
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. Lachrymal glands or tear glands are situated