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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

 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

Transistor

 Symbol

FET ( MOSFET )

Symbol

Common models

 Model Amps Max Volts Max IRF840A 8 500 RFP40N10 40 100