The Basic lessons · Basic electronics and theory · B-005-012

Resonance: Tuning Circuits to Select Frequencies

Learn how inductors and capacitors work together to create a circuit that strongly responds to one specific frequency while ignoring others. Understand why this effect is essential for selecting radio signals and how circuit arrangement changes the result.

This lesson is part of SignalPrep Pro. The subsection's 11 exam questions are free to practise: practise B-005-012.

What this subsection asks

• Resonance is the condition that exists when:
• At resonance, what impedance does a parallel tuned circuit exhibit?
• While the resonant frequency of a tuned circuit is a single frequency, the effect of resonance is significant over a certain range of frequencies. What is this range called?
• What two components are required to form a tuned circuit?
• When a parallel coil-capacitor combination is supplied with AC of different frequencies, there will be one frequency where the impedance will be highest. This is the:
• In a parallel-resonant circuit at resonance, the circuit has:
• In a series resonant circuit at resonance, the circuit has:
• A coil and an air-spaced capacitor are arranged to form a resonant circuit. The resonant frequency will remain the same if we:
• Resonant circuits in a receiver are used to:
• Resonance is the condition that exists when:
• What happens to current when a series RLC circuit is tuned to the frequency of the source?