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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
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Prefered Values.
| 1R0 |
10R |
100R |
1K0 |
10K |
100K |
1M0 |
10M |
| 1R2 |
12R |
120R |
1K2 |
12K |
120K |
1M2 |
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| 1R5 |
15R |
150R |
1K5 |
15K |
150K |
1M5 |
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| 1R8 |
18R |
180R |
1K8 |
18K |
180K |
1M8 |
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| 2R2 |
22R |
220R |
2K2 |
22K |
220K |
2M2 |
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| 2R7 |
27R |
270R |
2K7 |
27K |
270K |
2M7 |
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| 3R3 |
33R |
330R |
3K3 |
33K |
330K |
3M3 |
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| 3R9 |
39R |
390R |
3K9 |
39K |
390K |
3M9 |
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| 4R7 |
47R |
470R |
4K7 |
47K |
470K |
4M7 |
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| 5R6 |
56R |
560R |
5K6 |
56K |
56OK |
5M6 |
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| 6R8 |
68R |
680R |
6K8 |
68K |
680K |
6M8 |
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| 8R2 |
82R |
820R |
8K2 |
82K |
82OK |
8M2 |
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Capacitors
| Symbol |
 C |
| Units |
Farad, F |
Capacitors
in series
Ctotal = 1 / ( (1 / C1 ) + ( 1 /
C2 ) + ( 1 / C3 ) ) |
Capacitors
in parallel
Ctotal = C1 + C2 + C3
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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 |
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| Full Wave Rectifier |
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| Full Wave, 3 Phase |
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Transistor
| Symbol |
 |
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FET ( MOSFET )
| Symbol |
Common models
| Model |
Amps
Max |
Volts
Max |
| IRF840A |
8 |
500 |
| RFP40N10 |
40 |
100 |
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