Explain the construction and working of Electric Generator(AC). Draw a neat diagram and label it
Answers
Answer:
The construction and working of Electric Generator(AC).
Explanation:
An AC generator is an electric generator that converts mechanical energy into electrical energy in form of alternative emf . AC generator works on the principle of ”Electromagnetic Induction”.
Parts of an AC Generator
An Ac generator consists of two poles i.e is the north pole and south pole of a magnet so that we can have a uniform magnetic field. There is also a coil which is rectangular in shape that is the armature. .
The slip rings are made of metal and are insulated from each other. The brushes are carbon brushes and one end of each brush connects to the ring and other connects to the circuit. The rectangular coils rotate about an axis which is perpendicular to the magnetic field.
Emf induced in an AC generator
If the coil of N turn and area A is rotated at v revolutions per second in a uniform magnetic field B, then the motional emf produced is e = NBA(2πv)sin(2πv)t, where we assume that at time t = 0 s, the coil is perpendicular to the field. The direction of the induced emf is given by Fleming’s right-hand rule or the Lenz’s law.
Fleming’s right-hand rule states that, stretch the forefinger, the middle finger and the thumb of the right hand such that they are manually perpendicular to each other. If the forefinger indicates the direction of the magnetic field, rhumb indicates the direction of the motion of the conductor. The middle finger indicates the direction of the induced current in the conductor.
Learn about Motion in Combined Electric and Magnetic Field.
3-Phase AC generator
In a symmetric three-phase power supply system, three conductors each carry an alternating current of the same frequency and voltage amplitude relative to a common reference but with a phase difference of one third the period. The common reference usually connects to ground and often to a current-carrying conductor that is neutral.