1. What is Impedance and Admittance?

Impedance (Z) is the measure of opposition that a circuit presents to the flow of alternating current. Admittance (Y) is the reciprocal of impedance and represents how easily alternating current flows through a circuit.

2. How Does the Calculator Work?

The calculator uses the fundamental formulas:

Where:

• \( Z \) — Complex impedance (ohms)
• \( Y \) — Complex admittance (siemens)
• \( R \) — Resistance (ohms)
• \( X \) — Reactance (ohms)
• \( j \) — Imaginary unit

Explanation: The calculator computes the magnitude of impedance from resistance and reactance, then calculates admittance as the reciprocal of impedance magnitude.

3. Importance of Impedance and Admittance

Details: Understanding impedance and admittance is crucial for analyzing AC circuits, designing filters, transmission lines, and understanding the behavior of electrical components at different frequencies.

4. Using the Calculator

Tips: Enter resistance in ohms (must be ≥0) and reactance in ohms (can be positive for inductive or negative for capacitive). The calculator will compute both impedance magnitude and admittance.

5. Frequently Asked Questions (FAQ)

Q1: What is the difference between impedance and resistance?
A: Resistance opposes DC current, while impedance opposes AC current and includes both resistive and reactive components.

Q2: When is admittance used instead of impedance?
A: Admittance is often more convenient for parallel circuit analysis, while impedance is better for series circuits.

Q3: What does negative reactance indicate?
A: Negative reactance indicates capacitive behavior, while positive reactance indicates inductive behavior.

Q4: Can impedance be zero?
A: In theory, impedance approaches zero at resonance in ideal LC circuits, but in practice, there is always some resistance.

Q5: What are the units for admittance?
A: Admittance is measured in siemens (S), which is the reciprocal of ohms.