*Question G5A07:
What is the term for the inverse of impedance?*  

*Correct Answer is  D: Admittance*  

### AI Response: (may contain errors)  

The term for the inverse of impedance is **Admittance**. Let's break down why this is the correct answer and why the other options are not.

### Correct Answer: Admittance
- **Admittance** ($Y$) is defined as the inverse of impedance ($Z$). It is expressed mathematically as:
  
  $$
  Y = \frac{1}{Z}
  $$

- Admittance is measured in siemens (S) and represents how easily a circuit allows current to flow when a voltage is applied.

### Why the Other Choices are Incorrect:
1. **Conductance (A)**:
   - Conductance ($G$) is the real part of admittance and specifically refers to the inverse of resistance ($R$):
   
   $$
   G = \frac{1}{R}
   $$
   - While conductance is related to admittance, it does not account for the reactive component of impedance.

2. **Susceptance (B)**:
   - Susceptance ($B$) is the imaginary part of admittance and is the inverse of reactance ($X$):
   
   $$
   B = \frac{1}{X}
   $$
   - Like conductance, it is not the overall inverse of impedance but rather a component of it.

3. **Reluctance (C)**:
   - Reluctance is a term used in magnetic circuits and is the inverse of magnetic permeability. It is not related to electrical impedance.

### Summary
- **Admittance** is the correct term for the inverse of impedance, encompassing both conductance and susceptance.
- Remember the relationships:
  - $Y = G + jB$ (where $j$ is the imaginary unit)
  - $Z = R + jX$

Understanding these concepts will help you grasp the relationships between different electrical parameters, which is crucial for the Extra Class exam.