Question
What is admittance?
Answer Options
- A) The inverse of impedance
- B) The term for the gain of a field effect transistor
- C) The inverse of reactance
- D) The term for the on-impedance of a field effect transistor
Correct Answer: A
Explanation
In AC circuit analysis, impedance (Z) is a measure of the total opposition to the flow of current. It is a complex quantity consisting of resistance and reactance. While impedance is most natural for analyzing series circuits, its reciprocal is often more convenient for parallel circuit analysis.
Admittance (Y) is formally defined as the inverse of impedance (Y = 1/Z). Admittance measures the ease with which current flows in a circuit and is also a complex quantity, consisting of conductance (G) and susceptance (B). The unit of admittance is the Siemens (S), or mho (ohm spelled backwards).
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