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421022
UNIT 202
Description
Mind Map on UNIT 202, created by Lrowlands on 06/12/2013.
Mind Map by
Lrowlands
, updated more than 1 year ago
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Lrowlands
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Resource summary
UNIT 202
Ac Theory
Star Connection
Delta Connection
Dc Theory
Current
The Unit is Amperes (A)
EMF
Unit of EMF is Volts (V)
Resistance
Measured in OHM'S
The Formula Symbol R
Resistors in a series circuit
R1
R2
R3
RT= R1 + R2 + R3
Motors
3 Parts on a 3phrase
Stator
Electromagnets
Rotor
single phase motors
3 Phrase motors
3 types of Motors
Split Phase
Capacitor start/capacitor - run motor
Capacitor
DC Motors Components
Field - Stays still
Commutator (Attached to the armature)
Armature -moving part
Flips Polarity on a DC Motors, acts as a switch
Carbon Brush
Provide current to the moving part
Conducts Elecricity
Self Lubricating
Soft
Series
Parallel
Compound
DC Motor Components
Poles
Field Windings
Armature
Commutator
Carbon Brushes
Synchronous Speed (ns)
Speed of the magnetic field in the stator
Ns ( rps ) = F/P
Ns ( rpm ) = 60 X F / P
Nr = Rotor speed
Slip = Difference between Ns and Nr
Per Unit Slip = Ns - Nr / Ns
% Slip = Ns - Nr / Ns x 100
Transformers
Special Transformers
Self inductance
Equation for self Inductance : L X ( L2 - L1 ) / T
L = Value of Inductance in Henrys
T = Time in seconds
L1 and L2 = Values of Current
Mutual Inductance
Prefixs
Kilo -> k -> 1x10^3
mega -> M -> 1x10^6
GIGA -> G -> 1x10^9
Terra -> T -> 1x10^12
milli -> m -> 1x10-3
Micro -> yu -> 1x10-6
nano -> n -> 1x10-9
pico -> p -> 1x10-12
Positive
Negative
Floresent lighting
Ultra-Violet, Unless Phosphorus turns into visible light
Electrodes are parts at the end of the lights
Gas on the inside
The Ballast ( Chalk )
Limits The Lamps Operating Current
Provide the required voltage to start the lamp
Two Types
Electromagnetic
Electronic
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