GK SCIENTIST

General Knowledge One Stop Source
Menu
  • Home
  • Social Science
    • History
    • Political Science
    • Geography
  • Science
    • Physics
    • Chemistry
    • Biology
  • Chemistry Notes
  • Mathematics
  • Computer
  • Tutorial MySQL
  • Tutorial Python
  • Java Tutorial
  • English Grammar
  • English Essay
  • Indian Anthropology
  • Philosophy
  • Solved Paper
  • UPSC
  • Current Content
    • Current Affairs
    • RSTV News
    • Yojana and Kurukshetra Gist
  • Donate
  • Contact Us

If you are interested in advertising to our audience, submit the advertising enquiry form.

Advertising Enquiry
Physics

DC Generator or DC Dynamo

Gk Scientist September 21, 2022 No Comments
Tweet WhatsApp Telegram

Table of Contents

  • What is DC Generator?
  • Principle of DC Generator:
  • Construction of DC Generator:
  • Theory and Working of DC Generator:

What is DC Generator?

It is a device, which produces direct current energy from mechanical energy.

Principle of DC Generator:

DC Generator is based on the phenomenon of electromagnetic induction i.e. when the magnetic flux is linked with coil changes, an induced EMF is produced in the coil. The direction of induced EMF produced is given by Fleming’s Right-Hand Rule.

dc dynamo - DC Generator or DC Dynamo

Construction of DC Generator:

A DC Generator consists of the following parts-

(1) Armature- ABCD is rectangular armature coil. It consists of a large number of turns of insulated copper wire bounded over a soft iron core.

(2) Field Magnets- N and S are the pole pieces of a strong electromagnet. The armature coil is rotated between the pole pieces N and S.

(3) Split Rings- S1 and S2 are called split rings. The ends of the armature coil are connected with them.

(4) Brushes- B1 and B2 are two brushes. They are fixed and kept in light contact with S1 and S2. The purpose of the brushes is to pass on current from the armature coil to the external load resistance.

Theory and Working of DC Generator:

When the armature coil is rotated in the magnetic field, magnetic flux linked with the coil changes, and hence induced EMF is produced in the coil.

To start with, suppose the plane of the coil is perpendicular to the plane of the paper, with side AB at the front and side CD at the back. Now as the coil is rotated anticlockwise, AB moves inwards and CD moves outwards. Due to this, rotation of the coil, magnetic flux linked with the coil changes, and hence induced current are produced in the coil. According to Fleming’s Right-Hand Rule, the direction of current inside AB is from A to B and the direction of current inside CD is from C to D. Also, the direction of current through external resistance R is from Y to X.

After half the rotation, the side AB is at the back and the side CD is at the front. Now, as the coil is rotated further in an anticlockwise direction, CD moves inwards and AB moves outwards. Due to this rotation of the coil, magnetic flux linked with the coil changes, and hence induced current is produced in the coil. According to Fleming’s Right-Hand Rule, the direction of induced current inside CD is from D to C and the direction of current inside AB is from B to A. Also, the direction of current through external resistance R is from Y to X, and so on.

Hence the induced current in external resistance R does not change direction after half rotation of the coil. Hence induced current produced is a direct current.

Let N = Number of turns of the coil
A = Area of each turn of coil
Strength of magnetic field - DC Generator or DC Dynamo
angle which normal to the coil makes with magnetic field - DC Generator or DC Dynamo

We know magnetic flux linked with coil is given by
magnetic flux linked with coil - DC Generator or DC Dynamo
⇒ Φ = NBA cos θ
⇒ Φ = NBA cos ωt [where θ = ωt]

According to Faraday’s 2nd law of Electromagnetic Induction,
e = – dΦ/dt
⇒ e = – d (NBA cos ωt)/dt
⇒ e = -NBA [d (cos ωt)/dt]
⇒ e = -NBA [-ω sin ωt]
⇒ e = NBA ω sin ωt

But NBAω = e0 = Maximum value of induced EMF
⇒ e = e0 sin ωt

Also, the variation of induced EMF with time is shown in fig.
variation of induced EMF with time - DC Generator or DC Dynamo

Also, we know
I = e/R
⇒ I = e0 sin ωt/R
Put e0/R = I0 = Maximum value of current
⇒ I = I0 sin ωt
This is the required expression for the current produced by DC Generator.

Spectrometer
Refraction Through Prism
Applications of Ultrasonic Waves
Lawrence Cyclotron or Magnetic Resonance Accelerator
Nuclear Fusion and Stellar Energy
Read About Electric generator– Wikipedia
Prev Article
Next Article

Related Articles

Mutual Induction
What is Mutual Induction? It is defined as the phenomenon …
Gk Scientist May 29, 2022 Physics

Mutual Induction

Thermopile and Thermo-Electric Refrigerator
Thermopile: A thermopile is a sensitive instrument used for the …
Gk Scientist June 8, 2021 Physics

Thermopile and Thermo-Electric Refrigerator

Buoyancy And Archimedes Principle
Buoyancy And Archimedes Principle: Buoyancy: You must have noticed that …
Gk Scientist December 23, 2020 Physics

Buoyancy And Archimedes Principle

Cornu’s Method for Determination of Young’s Modulus Using Interference Phenomenon
Cornu’s Method for Determination of Young’s Modulus: In 1869 Cornu …
Gk Scientist July 30, 2022 Physics

Cornu’s Method for Determination of Young’s Modulus Using Interference Phenomenon

Distinguish Between Fresnel and Fraunhofer Diffraction
Distinguish Between Fresnel and Fraunhofer Diffraction: Diffraction of Light: When …
Gk Scientist July 26, 2022 Physics

Distinguish Between Fresnel and Fraunhofer Diffraction

Dispersive Power of Grating
Dispersive Power of Grating: The angular spacing between any two …
Gk Scientist July 27, 2022 Physics

Dispersive Power of Grating

Difference Between Interference and Diffraction of Light
Interference and Diffraction of Light: Interference- Interference of light is …
Gk Scientist September 28, 2021 Physics

Difference Between Interference and Diffraction of Light

Basic Theory of Interference or Condition for Constructive and Destructive Interference
Basic Theory of Interference: The waves emitted from two coherent …
Gk Scientist September 24, 2022 Physics

Basic Theory of Interference or Condition for Constructive and Destructive Interference

Leave a Reply Cancel Reply

Search




  • Popular
  • Recent




GK SCIENTIST

General Knowledge One Stop Source

Information

  • About Us
  • Terms and Condition, Disclaimer
  • Contact Us

Android Apps

  • IAS App For English Medium Students
  • IAS Basics App For English Medium Students
  • IAS Hindi App For Hindi Medium Students
DMCA.com Protection Status

Popular Tags

Biology (33) Biology Questions (88) Chemistry (57) Computer (211) Current Affairs (4) Current Content (0) Economy (6) English Essay (172) English Grammar (75) English Literature (10) Geography (83) History (259) Indian Anthropology (11) Indian Polity (14) JKAS Mains Question Papers (17) Mathematics (68) Moral Science (7) NCERT & Other Boards Books (25) Philosophy (114) Physics (89) Political Science (132) RS TV News (33) Science (553) Social Anthropology (7) Social Science (17) Solved Paper (47) UPSC (7) UPSC Mains Question Papers (26)

Downloads

  • NCERT Books
  • Old NCERT Books
  • NIOS Books For IAS, SSC, and State PSC Exam
  • Tamil Nadu Board Books: Important For UPSC, SSC, and State PSC Exam
  • Modern Indian and World History Notes For IAS Exam
  • UPSC Topper 2013 Gaurav Agrawal Notes For IAS Preparation
  • UPSC IAS Prelims General Studies – Previous Year Papers
  • UPSC Mains Question Papers

Copyright © 2023 GK SCIENTIST
Theme by MyThemeShop.com& Hosted On Cloudways

Ad Blocker Detected

Our website is made possible by displaying online advertisements to our visitors. Please consider supporting us by disabling your ad blocker.

Refresh
 

Loading Comments...