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Class 12 Exam  >  Class 12 Questions  >  AC generator producesa)alternating current fr... Start Learning for Free
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AC generator produces
  • a)
    alternating current from mechanical energy
  • b)
    alternating current from electrical energy
  • c)
    alternating current from kinetic energy
  • d)
    alternating current from chemical energy
Correct answer is option 'A'. Can you explain this answer?
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AC generator producesa)alternating current from mechanical energyb)alt...
Generator is a device that converts mechanical energy to electrical energy for use in an external circuit.
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AC generator producesa)alternating current from mechanical energyb)alt...
AC generator produces alternating current from mechanical energy.

An AC generator, also known as an alternator, is a device that converts mechanical energy into electrical energy in the form of alternating current (AC). It works based on the principle of electromagnetic induction.

Principle of electromagnetic induction:
Electromagnetic induction is the process of generating an electric current in a conductor by changing the magnetic field around it. This principle was discovered by Michael Faraday in the early 19th century.

Working of an AC generator:
An AC generator consists of the following components:
1. Rotor: The rotor is an electromagnet that rotates within a stationary magnetic field.
2. Stator: The stator is a stationary set of conductors that produce a magnetic field.

The working of an AC generator can be explained in the following steps:

1. Mechanical energy input: Mechanical energy is supplied to the generator, usually in the form of a rotating shaft or turbine.
2. Rotation of the rotor: When the mechanical energy is supplied, the rotor starts rotating at a constant speed.
3. Induced electromotive force (EMF): As the rotor rotates, the magnetic field produced by the rotor cuts across the conductors in the stator. This changing magnetic field induces an electromotive force (EMF) or voltage across the stator windings.
4. Alternating current generation: The induced EMF causes an alternating current to flow in the stator windings. The magnitude and direction of the current change periodically as the rotor continues to rotate.
5. Output terminals: The alternating current generated in the stator windings is then transferred to the external circuit through the output terminals of the generator.
6. Load utilization: The alternating current can be used to power various electrical devices and appliances.

Advantages of AC generators:
- AC generators are more efficient and reliable compared to DC generators.
- AC generators can transmit electrical energy over long distances without significant losses.
- AC generators can be easily synchronized to work in parallel, allowing for the generation of large amounts of power.

In conclusion, an AC generator produces alternating current from mechanical energy by utilizing the principle of electromagnetic induction. It converts the mechanical energy input into electrical energy output, which can then be used to power various devices and systems.
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Read the following text and answer the following questions on the basis of the same:Spark coil The principle of electromagnetic induction was discovered by Michael Faraday in 1831. Induction coils were used widely in electrical experiments and for medical therapy during the last half of the 19th century, eventually leading to the development of radio in the 1890's. The spark coil designed on the principle of electromagnetic induction was the heart of the earliest radio transmitters. Marconi used a spark coil designed by Heinrich Rhumkorff in his early experiments. An induction coil or "spark coil" is a type of electrical transformer used to produce high-voltage pulses from a low-voltage (DC) supply. To create the flux changes necessary to induce voltage in the secondary coil, the direct current in the primary coil is repeatedly interrupted by a vibrating mechanical contact called interrupter.The spark scoil consists of two coils of insulated wire wound around a common iron core. One coil, called the primary coil, is made from relatively few (tens or hundreds) turns of coarse wire. The other coil, the secondary coil typically consists of up to a million turns of fine wire (up to 40 gaug e). An electric current is passed through the primary, creating a magnetic field. Because of the common core, most of the primary's flux couples with the secondary. When the primary current is suddenly interrupted, the magnetic field rapidly collapses. This causes a high voltage pulse to be developed across the secondary terminals due to electromagnetic induction. Because of the large number of turns in the secondary coil, the secondary voltage pulse is typically many thousands of volts. This voltage is sufficient to create an electric spark, to jump across an air gap separating the secondary's output terminals. For this reason, this induction coils are also called spark coils. To operate the coil continually, the DC supply current must be repeatedly connected and disconnected. To do that, a magnetically activated vibrating arm called an interrupter is used which rapidly connects and breaks the current flowing into the primary coil. The interrupter is mounted on the end of the coil next to the iron core. When the power is turned on, the produced magnetic field attracts the armature. When the armature has moved far enough, contacts in the primary circuit breaks and disconnects the primary current. Disconnecting the current causes the magnetic field to collapse and create the spark. A short time later the contacts reconnect, and the process repeats. An arc which may form at the interrupter contacts is undesirable. To prevent this, a capacitor of 0.5 to 15 μF is connected across the primary coil.Spark coil is a type of

Read the following text and answer the following questions on the basis of the same:Spark coilThe principle of electromagnetic induction was discovered by Michael Faraday in 1831. Induction coils were used widely in electrical experiments and for medical therapy during the last half of the 19th century, eventually leading to the development of radio in the 1890's. The spark coil designed on the principle of electromagnetic induction was the heart of the earliest radio transmitters. Marconi used a spark coil designed by Heinrich Rhumkorff in his early experiments. An induction coil or "spark coil" is a type of electrical transformer used to produce high-voltage pulses from a low-voltage (DC) supply. To create the flux changes necessary to induce voltage in the secondary coil, the direct current in the primary coil is repeatedly interrupted by a vibrating mechanical contact called interrupter.The spark scoil consists of two coils of insulated wire wound around a common iron core. One coil, called the primary coil, is made from relatively few (tens or hundreds) turns of coarse wire. The other coil, the secondary coil typically consists of up to a million turns of fine wire (up to 40 gaug e). An electric current is passed through the primary, creating a magnetic field. Because of the common core, most of the primary's flux couples with the secondary. When the primary current is suddenly interrupted, the magnetic field rapidly collapses. This causes a high voltage pulse to be developed across the secondary terminals due to electromagnetic induction. Because of the large number of turns in the secondary coil, the secondary voltage pulse is typically many thousands of volts. This voltage is sufficient to create an electric spark, to jump across an air gap separating the secondary's output terminals. For this reason, this induction coils are also called spark coils. To operate the coil continually, the DC supply current must be repeatedly connected and disconnected. To do that, a magnetically activated vibrating arm called an interrupter is used which rapidly connects and breaks the current flowing into the primary coil. The interrupter is mounted on the end of the coil next to the iron core. When the power is turned on, the produced magnetic field attracts the armature. When the armature has moved far enough, contacts in the primary circuit breaks and disconnects the primary current. Disconnecting the current causes the magnetic field to collapse and create the spark. A short time later the contacts reconnect, and the process repeats. An arc which may form at the interrupter contacts is undesirable. To prevent this, a capacitor of 0.5 to 15 μF is connected across the primary coil.The heart of the radio transmitters of Marconi was a

AC generator producesa)alternating current from mechanical energyb)alternating current from electrical energyc)alternating current from kinetic energyd)alternating current from chemical energyCorrect answer is option 'A'. Can you explain this answer?
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