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Electronic formulas

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:

 Effective value [Also known as Root-Mean Square (RMS) value] = 0.707 x peak value Half Cycle Average value = 0.637 x peak value Peak value = 1.414 x effective value Effective value = 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)