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ELECTRONIC FORMULAS |
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Ohm's Law Formulas for D-C Circuits.
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Ohm's Law Formulas for A-C Circuits.
In these formulas
 is the angle of lead
or lag between current and voltage
and cos
= P/EI = power factor.
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Resistors in Series
Rtotal = R1 + R2
+ R3 + . . . . |
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Two Resistors in Parallel
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Resistors in Parallel, General Formula
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Sinusoidal Voltages and Currents
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Effective value
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=
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0.707 x peak value
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[Also known as Root-Mean Square (RMS) value]
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Half Cycle Average value
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=
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0.637 x peak value
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Peak value
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=
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1.414 x effective value
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Effective value
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=
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1.11 x average value |
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Resonant Frequency Formulas:
*Where in the second formula f is in kHz and L and C are in
micro units.
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Conductance
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Reactance Formulas
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Impedance Formulas
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Q or Figure of Merit
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Power Factor
pf = cos
, where
is the angle of lead or lag
Note: Active power is the "resistive" power
and equals the equivalent heating
effect on water.
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Three-phase AC Configurations (120 deg phase difference between each
voltage)
If the connection to a three phase AC configuration is miswired, switching
any two of the phases will put it back in the proper sequence. Electric power
for ships commonly uses the delta configuration, while commercial electronic and
aircraft applications commonly use the wye configuration.
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Voltage/Current Phase Rule of Thumb: Remember "ELI the ICE man"
ELI: Voltage (E) comes before (leads) current (I) in an inductor (L)
ICE: Current (I) comes before (leads) Voltage (E) in a capacitor (C)
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Color Code for Resistors
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Color Code for House Wiring
| Color Code |
Purpose |
Color Code for Chassis Wiring: |
| Black or red
| HOT
| Red
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| White
| NEUTRAL (Return)
| White
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| Green or bare
| GROUND
| Black |
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ADDITIONAL INFORMATION
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here for Product PDF files |
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