The reciprocal of impedance is called

Options

A. susceptance
B. conductance
C. admittance
D. transconductance

Explanation

To solve the question, we need to identify the term that refers to the reciprocal of impedance in electrical circuits.

### Step-by-Step Solution:

1. **Understanding Impedance**:
- Impedance (denoted as \( Z \)) is a measure of how much a circuit resists the flow of alternating current (AC). It combines both resistance (R) and reactance (X), which can be inductive (XL) or capacitive (XC).

2. **Impedance Formula**:
- The impedance in an LCR circuit can be expressed as:
\[ Z = \sqrt{R^2 + (X_L - X_C)^2} \]
- Here, \( X_L \) is the inductive reactance and \( X_C \) is the capacitive reactance.

3. **Reciprocal of Impedance**:
- The reciprocal of impedance \( Z \) is given by:
\[ \frac{1}{Z} \]
- This reciprocal is known as **admittance**.

4. **Conclusion**:
- Therefore, the term that refers to the reciprocal of impedance is **admittance**.

### Final Answer:
The reciprocal of impedance is called **admittance**.