Question
What is susceptance?
Answer Options
- A) The magnetic impedance of a circuit
- B) The ratio of magnetic field to electric field
- C) The imaginary part of admittance
- D) A measure of the efficiency of a transformer
Correct Answer: C
Explanation
Susceptance (B) is a fundamental electrical quantity used in the analysis of AC circuits. It is part of the concept of admittance (Y), which is the reciprocal of impedance (Z). Admittance is expressed in a complex number form similar to impedance, making it easier to analyze parallel circuits.
Admittance (Y) is defined as Y = G + jB, where G is the real part (conductance, the reciprocal of resistance). Therefore, susceptance is the imaginary part of admittance, representing the ease with which current flows due to the reactive components (inductors and capacitors) in the circuit. It is measured in units of Siemens (S).
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