Common Electronics Formulas

1. Ohm's Law

V = I * R

Where V is voltage, I is current, and R is resistance

2. Power

P = V * I

Where P is power, V is voltage, and I is current

3. Capacitive Reactance

Xc = 1 / (2 * p * f * C)

Where Xc is capacitive reactance, f is frequency, and C is capacitance

4. Resonant Frequency

f = 1 / (2 * p * v(L * C))

Where f is resonant frequency, L is inductance, and C is capacitance

5. Inductive Reactance

XL = 2 * p * f * L

Where XL is inductive reactance, f is frequency, and L is inductance

6. Impedance in RC Circuit

Z = v(R� + Xc�)

Where Z is impedance, R is resistance, and Xc is capacitive reactance

7. Decibel Gain

Gain (dB) = 20 * log10(Vout / Vin)

Where Vout is output voltage and Vin is input voltage

8. RC Time Constant

t = R * C

Where t is the time constant, R is resistance, and C is capacitance

9. Transformer Turns Ratio

Vp / Vs = Np / Ns

Where Vp is primary voltage, Vs is secondary voltage, Np is number of primary turns, and Ns is number of secondary turns

10. Voltage Divider

Vout = (R2 / (R1 + R2)) * Vin

Where Vout is output voltage, Vin is input voltage, R1 and R2 are resistors in series