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Impedance Calculator

ac impedance calculator. Get instant, accurate results. Enter values for instant results with step-by-step formulas.

Reviewed by Manoj Kumar, Mathematics Educator

Reviewed by Manoj Kumar, Mathematics Educator

Formula

Z = โˆš(Rยฒ + (X_L - X_C)ยฒ) | ฯ† = arctan((X_L-X_C)/R)

Total opposition to AC current flow. Combines resistance and reactance.

Worked Examples

Example 1: RLC circuit

Problem:R=100ฮฉ, XL=150ฮฉ, XC=50ฮฉ

Solution:Z=โˆš(10000+10000)=141.4ฮฉ, ฯ†=45ยฐ

Result:141.4 ฮฉ at 45ยฐ

Frequently Asked Questions

What is impedance and how does it differ from resistance?

Resistance opposes DC current and is purely real. Impedance opposes AC current and includes resistance plus reactance (from capacitors and inductors). Impedance is a complex number: Z = R + jX, measured in ohms. Capacitive reactance decreases with frequency while inductive reactance increases with frequency.

Reviewed by Manoj Kumar, Mathematics Educator ยท Editorial policy