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Ohm's Law Formulas for D-C Circuits:
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.
Resistors in Series: Rtotal = R1
+ R2 + R3 + . . . .
Two Resistors in Parallel:
Resistors in Parallel, General Formula:
Sinusoidal Voltages and Currents:
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Effective value [Also known as Root-Mean
Square (RMS) value] |
=
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0.707 x peak value
|
| |
Half Cycle Average value
|
=
|
0.637 x peak value
|
| |
Peak value
|
=
|
1.414 x effective value
|
| |
Effective value
|
=
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1.11 x average value |
Resonant Frequency Formulas:
*Where in the second formula f is in kHz and L and C are in
microunits.
Conductance:
Reactance Formulas:
Impedance Formulas:
Q or Figure of Merit:
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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