#reactance

AC complex-impedance maths as an API, computed locally and deterministically. The series endpoint computes the impedance of a series R-L-C circuit at a given frequency — the inductive reactance X_L = 2πf·L, the capacitive reactance X_C = 1/(2πf·C), the complex impedance Z = R + j(X_L − X_C), its magnitude |Z| = √(R²+X²) and phase angle φ = atan(X/R) — and classifies the circuit as inductive (current lags), capacitive (current leads) or resistive. The parallel endpoint computes a parallel R-L-C impedance through its admittance Y = 1/R + j(ωC − 1/ωL) and Z = 1/Y, with magnitude and phase. The ac-ohm endpoint applies Ohm's law for AC, I = V / |Z|, to give the RMS current and apparent power from an RMS voltage and an impedance specified either as resistance and reactance or as a magnitude, and the real power when the phase is known. Resistance and reactance are in ohms, inductance in henries, capacitance in farads, frequency in hertz and voltage RMS in volts; phase is in degrees. Everything is computed locally and deterministically, so it is instant and private. Ideal for electronics, audio, RF-filter, power-supply and motor-control app developers, AC-circuit and phasor tools, and electrical-engineering education. Pure local computation — no key, no third-party service, instant. Live, nothing stored. 3 endpoints. This is AC complex impedance; for the resonant frequency and reactance alone use a resonance API and for power-factor correction a power-factor API.

api.oanor.com/impedance-api

AC reactance and LC/RC tuning maths as an API, computed locally and deterministically. The reactance endpoint computes the capacitive reactance Xc = 1/(2πfC) and the inductive reactance Xl = 2πfL at a given frequency, and — when both a capacitor and an inductor are supplied — the net series reactance X = Xl − Xc, whether the circuit looks inductive, capacitive or resonant, and the impedance magnitude. The resonant endpoint computes the LC resonant frequency f₀ = 1/(2π√(LC)), or, given a target frequency and one component, solves the other component you need to tune to it. The cutoff endpoint computes the RC or RL filter cutoff frequency — fc = 1/(2πRC) for RC, fc = R/(2πL) for RL — and the time constant. Frequencies are in hertz; capacitance, inductance and resistance accept SI base units with handy µF/nF/pF and mH/µH inputs. Everything is computed locally and deterministically, so it is instant and private. Ideal for electronics, RF, audio-filter and embedded app developers, tuning and filter-design tools, and electronics education. Pure local computation — no key, no third-party service, instant. Live, nothing stored. 3 endpoints. This is AC reactance & LC/RC tuning; for LED series-resistor sizing use an LED-resistor API and for VSWR and impedance match use a VSWR API.

api.oanor.com/resonance-api

Electronics circuit maths as an API. The ohms-law endpoint takes any two of voltage, current, resistance and power and returns all four (V = IR, P = VI = I²R = V²/R). The combine endpoint computes the total of resistors, capacitors or inductors wired in series or parallel — resistors and inductors add in series and combine reciprocally in parallel, while capacitors do the opposite. The voltage-divider endpoint computes the output voltage of a two-resistor divider and the current through it. The reactance endpoint computes capacitive reactance (Xc = 1/2πfC), inductive reactance (XL = 2πfL), the LC resonant frequency, and the RC or RL time constant. Everything is computed locally with exact formulas in SI units, so it is instant and private. Ideal for electronics design and education, embedded and hardware engineering, hobby and bench projects, and physics teaching. Pure local computation — no key, no third-party service, instant. Live, nothing stored. 5 endpoints. This is circuit maths; for resistor colour codes use a resistor API and for general unit conversion use a unit API.

api.oanor.com/ohmslaw-api