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Components  

Resistors

Symbol R
Units Ohms ( )
Resistors in series

Rtotal = R1 + R2 + R3
Resistors in parallel

Rtotal = 1 / ( (1 / R1 ) + ( 1 / R2 ) + ( 1 / R3 ) )

Resistor Colour Codes

Prefered Values.

1R0 10R 100R 1K0 10K 100K 1M0 10M
1R2 12R 120R 1K2 12K 120K 1M2
1R5 15R 150R 1K5 15K 150K 1M5
1R8 18R 180R 1K8 18K 180K 1M8
2R2 22R 220R 2K2 22K 220K 2M2
2R7 27R 270R 2K7 27K 270K 2M7
3R3 33R 330R 3K3 33K 330K 3M3
3R9 39R 390R 3K9 39K 390K 3M9
4R7 47R 470R 4K7 47K 470K 4M7
5R6 56R 560R 5K6 56K 56OK 5M6
6R8 68R 680R 6K8 68K 680K 6M8
8R2 82R 820R 8K2 82K 82OK 8M2

 



Capacitors

Symbol C
Units Farad, F
Capacitors in series

Ctotal = 1 / ( (1 / C1 ) + ( 1 / C2 ) + ( 1 / C3 ) )
Capacitors in parallel

Ctotal = C1 + C2 + C3


Inductors

Symbol L
Units Henry, H
Inductors in series

Ltotal = L1 + L2 + L3
Inductors in parallel

Ltotal = 1 / ( (1 / L1 ) + ( 1 / L2 ) + ( 1 / L3 ) )
Note: for inductors in series or parallel, the above formular works so long as the inductors are spaced far enough apart to not affect each other. Remember inductors generate magnet fields, and these can affect other inductors if close enough.

Diodes / Rectifier

Symbol D
Half Wave Rectifier
     
Full Wave Rectifier
     
Full Wave, 3 Phase    

Transistor

Symbol

FET ( MOSFET )

Symbol

Common models

Model Amps Max Volts Max
IRF840A 8 500
RFP40N10 40 100


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