DC basics
What is the formula for electrical power?
P = I × E
What is peak voltage from RMS?
Vₚ = Vᵣₘₛ × √2
What is inductive reactance?
Xₗ = 2πfL
What is transformer voltage ratio?
V₂/V₁ = N₂/N₁
What is RC time constant?
τ = RC
What is Ohm’s Law?
V = I × R
What is RMS voltage from peak?
Vᵣₘₛ = Vₚ / √2
What is capacitive reactance?
Xc = 1/(2πfC)
What is transformer current ratio?
I₁/I₂ = N₂/N₁
What is RL time constant?
τ = L/R
What is current when given voltage and resistance?
I = V / R
What is real AC power?
P = Vᵣₘₛ × Iᵣₘₛ × cosφ
What is impedance in an RLC circuit?
Z = √(R² + (Xₗ−Xc)²)
What is efficiency percentage?
%η = (Pₒᵤₜ / Pᵢₙ) × 100
What is RC low-pass cutoff frequency?
f₍₋₃dB₎ = 1/(2πRC)
What is total resistance for resistors in series?
Rₜ = R₁ + R₂ + …
What is apparent power?
S = Vᵣₘₛ × Iᵣₘₛ
What is resonant frequency?
fᵣ = 1/(2π√(LC))
What is power gain in dB?
dB = 10 log₁₀(P₂/P₁)
What is VSWR?
VSWR = (1+Γ)/(1−Γ)
What is total resistance for resistors in parallel?
1/Rₜ = 1/R₁ + 1/R₂
What is reactive power?
Q = Vᵣₘₛ × Iᵣₘₛ × sinφ
What is quality factor Q?
Q = Xₗ / R
What is voltage gain in dB?
dBV = 20 log₁₀(V₂/V₁)
What is reflection coefficient?
Γ = (Zₗ−Z₀)/(Zₗ+Z₀)
What is total capacitance for capacitors in parallel?
Cₜ = C₁ + C₂
What is power factor?
PF = P / S
What is total capacitance for capacitors in series?
1/Cₜ = 1/C₁ + 1/C₂
What is wavelength?
λ = c / f
What is maximum power transfer?
Rₗ = Rₜₕ