1. ELECTRICAL TECHNOLOGY 17331 COMPUTER ENGINEERING 2017-2018
BY : PROF.KIRAN INAMDAR
PILLAI HOC POLYTECHNIC, RASAYANI

2. Current :- TYPES OF CURRENT :-
CURRENT is defined as the movement of electrons or flow of electrons inside a conducting material / medium. It is denoted by ( I ) and measure in (A) ampere.
TYPES OF CURRENT :-
A) ALTERNATING CURRENT ( A.C CURRENT)
B) DIRECT CURRENT ( D.C CURRENT)

3. Alternating Current :-
Alternating quantities are those quantities in which direction as well as magnitude both changes periodically.
Alternating Current (AC) is a type of electrical current, in which the direction of the flow of electrons switches back and forth at regular intervals or cycles.
 Current flowing in power lines and normal household electricity that comes from a wall outlet is alternating current.

4. Direct current (DC) is the unidirectional flow of electric charge.
Direct quanties are those quantities in which both magnitude and direction both remains constant.
Direct current (DC) is the unidirectional flow of electric charge.
 Direct current is produced by sources such as batteries, thermocouples, solar cells, and commutate-type electric machines of the dynamo type.

5. DIFFERENTIATE BETWEEN
A.C CURRENT
D.C CURRENT
It is a signal which changes its Magnitude as well as Direction periodically
Use of Transformer is Possible.
Frequency is like 50 Hz.
Generation ,transmission and distribution is EASY.
Application: AC motors, House-hold etc.
It is a signal in which Magnitude and Direction both remains constant.
Use of Transformer is Not Possible.
Frequency is consider ZERO.
Generation is difficult as needs additional arrangement such as rectifier circuit.
Application: DC machines, Industries etc.

6. Electromagnetic Induction
Electromagnetic Induction is the phenomenon of Voltage Induction in a conductor placed in the Magnetic Field.
It was invented by English Scientist Michael Faraday in 1831.
He invented
Faraday’s Laws of Electromagnetic Induction :-
A) Faraday’s First Law.
B) Faraday’s Second Law.

7. Faraday’s first Law :-
Whenever a conductor cuts the magnetic flux an emf is induced in it
When ever the Magnetic Flux linking with the circuit changes and E.M.F. is always induced in it. OR
When ever the Conductor cuts across the Magnetic lines of Flux an E.M.F. is always induced in it

8. Right hand rule (Fleming's right hand rule)
Fleming's right hand rule (for generators) shows the direction of induced current when a conductor moves in a magnetic field.
The right hand is held with the thumb, first finger and second finger mutually perpendicular to each other (at right angles), as shown in the diagram .
The Thumb represents the direction of Motion of the conductor.
The First finger represents the direction of the Field. (north to south)
The Second finger represents the direction of the Induced or Generated Current

9. Lenz’s law Simple statement : Actual Statement :
The direction of induce E.M.F is such that its oppose the cause which is responsible for inducing the e.m.f.
Actual Statement :
The direction of induced E.M.F produced due to the process of Electromagnetic Induction is always such that, it will set up a current to oppose the basic cause responsible for inducing the E.M.F.

10. Definition :
Wave Form – The Wave-Form is define as Graphical Representation of various quantity ( Voltage, Current, Power etc.) with respect to Time .
Cycle – Cycle is define as each repetition of variable quantity Re- accruing at equal Interval.
Frequency – Frequency is define as number of Cycles per second.
Time Period - Time period is define as time taken in to complete one cycle in a Second.

11. Reference :- WIKIPEDIA. YOUTUBE. LABORATORY- ELECTRICAL ENGINEERING.
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