Important parts of an ac dynamo, Physics

1)The armature ABCD consists of a copper wire wound on cylindrical soft-iron core.The armature can be rotated horizontal axis perpendicular to magnetic field.

2)NS is permanent horseshoe magnet with concave surfaces at poles and provides stationary magnetic field.

3) The two leads of armature coil are connected to two slip-rings S1 and S2. These slip rings are fixed on a shaft which is contact with a soft-iron core. When shaft is rotated with the help of a mechanical energy source, the armature and slip rings rotate in the same axis.

4) B1, B2 are carbon brushes. They are always in contact with slip-rings S1 and S2. These brushes B1 and B2 are connected to external circuit along resistance or load R.

Working: When the armature rotates the magnetic flux linked with it charges and electric current is induced in the coil which flows through the load resistance R. Consider the armature to be in the vertical position and let it rotate in anticlockwise direction. The wires AB move downward and CD move upward and according to Flemings right hand rule the induced current flows from B to A and from D to C. Therefore during the first half rotation of the armature, the current flows in the coil in the direction BADC. During the second half rotation the current flows in the direction CDAB. The magnitude of the induced EMF and the current also change. In this way, alternating current is produced.

1853_Important parts of an AC dynamo.png

Posted Date: 8/28/2012 9:21:04 AM | Location : United States







Related Discussions:- Important parts of an ac dynamo, Assignment Help, Ask Question on Important parts of an ac dynamo, Get Answer, Expert's Help, Important parts of an ac dynamo Discussions

Write discussion on Important parts of an ac dynamo
Your posts are moderated
Related Questions
(a) Equation (3) may be viewed as a formalism of synaptic plasticity - the synapse is able to change in strength in response to either use or disuse of it. We can observe the s

A closed magnetic circuit of cast steel have a 6cm long path of cross-sectional area 1 cm 2 and a 2 cm path of cross-sectional area 0.5cm 2 . A coil of 200 turns is wound arou

Define the term intrinsic stand-off ration in UJT.   Ans:  Intrinsic Stand-off Ratio: Equivalent circuit of a UJT is demonstrated in fig. (a). Emitter diode forms the junctio

Simultaneity principle The principle that all of the frames of reference will have invariant simultaneity; i.e., two events perceived as simultaneous (that is, having the simi

Explain Kelvin-Planck statement and Clausius statement Kelvin-Planck statement: "No process is possible whose sole result is the absorption of heat from a reservoir and the t

Carbon: Atomic number 6 Symbol C Atomic weight 12.011 Discovery Carbon exists fre


moment of inertia theory and easy diagrams

Explain the acoustic cavitation. Acoustic Cavitation: Usually, cavitation is the phenomenon where largely and small empty cavities are generated into fluids that expand to l

A person is determining the description of the image formed by a converging lens by implies of a ray tracing diagram. The person has gotten so far as drawing one principal ray. Wha