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E5B06

ELECTRICAL PRINCIPLES · Time constants and phase relationships: RL and RC time constants; phase angle in reactive circuits and components; admittance and susceptance

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What is susceptance?

  1. AThe magnetic impedance of a circuit
  2. BThe ratio of magnetic field to electric field
  3. CThe imaginary part of admittance
  4. DA measure of the efficiency of a transformer
Why Admittance Y is the reciprocal of impedance, Y = 1/Z, and like impedance it has two parts: Y = G + jB, where G is conductance (the real part) and B is susceptance (the imaginary part). Susceptance is the reciprocal-style measure of reactance in a parallel circuit, expressed in siemens, and it is positive for capacitance and negative for inductance in this convention. Using admittance makes parallel circuits easy because conductances and susceptances simply add.
Watch out The choice about magnetic impedance is a made-up term, and the ratio of electric to magnetic field is the wave impedance of a medium, not susceptance.
Impedance = R + jX; flip it over and you get Admittance = G + jB. B is the imaginary half, susceptance.
HamSandwich explanation, first draft. The question and answers are the NCVEC text.
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The rest of E5B

  1. E5B01 What is the term for the time required for the capacitor in an RC circuit to be charged to 63.2% of the appli…
  2. E5B02 What letter is commonly used to represent susceptance?
  3. E5B03 How is impedance in polar form converted to an equivalent admittance?
  4. E5B04 What is the time constant of a circuit having two 220-microfarad capacitors and two 1-megohm resistors, all i…
  5. E5B05 What is the effect on the magnitude of pure reactance when it is converted to susceptance?
  6. E5B06 What is susceptance?
  7. E5B07 What is the phase angle between the voltage across and the current through a series RLC circuit if XC is 500 …
  8. E5B08 What is the phase angle between the voltage across and the current through a series RLC circuit if XC is 300 …
  9. E5B09 What is the relationship between the AC current through a capacitor and the voltage across a capacitor?
  10. E5B10 What is the relationship between the AC current through an inductor and the voltage across an inductor?
  11. E5B11 What is the phase angle between the voltage across and the current through a series RLC circuit if XC is 25 o…
  12. E5B12 What is admittance?
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