Electrical all units and important deffination

 ALL IMPORTANT ELECTRICAL UNIT'S :

unit of current = ampere 

unit of voltage = volt

unit resistance = ohm

unit of Conductance = mho

unit of Inductance = Henry

unit of reactance = ohm

unit of condenscer = farad

unit of impedance = ohm

unit of flux = weber

unit of frequency = cycles/second

unit of specific resistance = micro meter

unit of power = watt

unit of kilowatt hour = kilowatt hour

unit of voltage drop = volt

unit of Potential difference = volt

unit of speed = r.p.m

unit of back e.m.f = volt

unit of torque = Newton meter

unit of luminous intensity =candila

unit of luminous flux = lumen

unit of illumination = lux

unit of Electric charge= Coulomb

unit of Capacitance = farad

unit of energy = Jule 

unit of time = second

unit of wavelength = meter

Unit of force = Newton

Unit of pressure = pascal

Unit of mass = kilogram

Unit of area= square meter

Unit of volume= cube meter

Unit of acceleration = meter per second square

Important deffination :

1.Matter: A substance which occupies some space, weight and can be felt by one or more senses is called the matter. 

2.Weight: The weight of a body is the gravitational force with which the earth attracts the body towards its center.

3. Mass: Mass is defined, as the quantity of the matter contained in a body and it is constant in all places. 

4. Speed: The rate of change of motion or the rate of change of displacement of a body in any direction is called speed  .

5. Velocity: The velocity is defined as the rate of displacement of a body in a certain direction. 

6. Acceleration: The rate of change of velocity of a body is known as acceleration. 

 7. Force: Force is something which changes or tends to change the position of a body. 

8. Momentum : The momentum of an object is the product of its mass and velocity. Its unit is kg.m/sec.

Momentum Mass x Velocity.

9.  Electromotive force: It is the force which causes the current to flow in the Circuit.

10. Potential difference( voltage ): The potential difference is the pressure between any two points in a circuit. 

11. Current: The flow of electrons is called the current. 

13. resistance : the opposition of flow of current is called resistance .

14. Conductor :the substance electricity can pass easyly that's called Conductor

15.insulator : the substance can electricity do not pass that's called insulator .

16. mangetism  : the substance which art magnetic material that's called magnet .

17. Permanent magnet: magnet which retains the magnetic properties for longer period is called permanent magnet. 

18 .  Temporary magnet:  magnet which attains the magnetic properties for short period is called temporary magnet. 

20. Lenz's Law: The e.m.f. induced in a circuit  flow of current in that, and its direction is always opposite to the cause which is called Lenz's Law

21. Faraday's Laws of electromagnetic induction:

(i) First Law: When any conductor cuts the magnetic lines of force or magnetic lines of force cuts the conductor .

(ii) Second Law: The e.m.f. induced in the conductor is proportional to number of turns, speed and flux density. 

22. Fleming right hand rule : right hand rule state that middle finger ,thumb and four finger of right hand thumb is indicate motion,middle finger indicate line of force and four finger indicate current.

23. Fleming left hand rule :left  hand rule state that middle finger ,thumb and four finger of left hand thumb is indicate direction of force ,middle finger indicate direction of magnetic field and four finger indicate direction of current.

24. alternating current : the current or voltage whose always change his direction is called alternating current .

25.direct current : the current whose did not change his direction is known as direct current .

26.Phase Voltage: The voltage across single phase is called phase voltage.

27 . Line Voltage: The voltage across two phases  is called Line voltage. 

Phase Current: The current flowing in any one phase is called phase Current.

Line Current: The current flowing in the line is called Line current. 

28. semiconductor : the material which not good Conductor and or nor good insulator is called semiconductor .

29. generator : the machine who's convert mechanical energy in to electrical energy that's called generator

30.alternator: the machine who's convert mechanical energy in to ac electrical energy is called alternator

31.DC generator : the machine who's convert mechanical energy in to DC electrical energy 

 32. Lap Winding: The winding used to carry more current and less voltage is called lap winding. 

33. Wave Winding: The winding used to carry more voltage and less current is called wave winding. 

34. series generator : the generator having field winding connected in series with armatur is known as series generator .

35. shunt generator : in this Generator the field winding is connected across the armatur parallel to armature a shunt with high resistance is known as shunt generator.

36 . Stray Losses: The losses occuring due to friction while moving the machine and in the core is called stray losses 

37. DC motor : tht machine who's convert DC electrical energy in to mechanical energy is called DC motor .

38. ohm's law : in a closed DC Circuit current directly prapertional voltage and inversely prapertional to resistance and iatempreture remain constant .

39. transformer : transformer is a static device which transfer electrical energy without changing frequency 

40. ac motor : a machine who's convert ac electrical engineer in to mechanical energy that's called ac motor.