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E5 · Electrical Principles

Amateur Extra · correct answers only, in question-pool order.

E5A01

What can make the voltage across a reactance in a series RLC circuit exceed the applied voltage?

AnswerResonance.

At resonance, circulating current can be large and the individual voltages across L and C can greatly exceed the source voltage while canceling each other in the series sum.

EXTRAE5 · Electrical Principles

E5A03

What is the impedance magnitude of a series RLC circuit at resonance?

AnswerApproximately equal to the circuit resistance.

At series resonance, inductive and capacitive reactance cancel, leaving the resistive part of the impedance.

TECH // ELEMENT 2

GENERAL // ELEMENT 3

EXTRA // ELEMENT 4

E5 · Electrical Principles

What can make the voltage across a reactance in a series RLC circuit exceed the applied voltage?

What is the impedance magnitude of a series RLC circuit at resonance?

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