Quality factor shows us:
Correct answer: C. Both energy stored and dissipated per cycle
- A. Energy stored per cycle
- B. Energy dissipated per cycle
- C. Both energy stored and dissipated per cycle
- D. Power loss
Explanation
The quality factor (Q-factor) of an oscillating system is defined as the ratio of the energy stored to the energy dissipated per cycle. It indicates how underdamped an oscillator is and quantifies the sharpness of its resonance peak. A higher quality factor means the system retains energy for more cycles before it is dissipated as heat. Option A focuses solely on energy storage, while Option B focuses solely on energy dissipation. Option D refers to power loss, which is associated with energy dissipation but does not comprehensively define the quality factor. Therefore, Option C is correct as it covers both aspects.
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About Alternating Current
Alternating current varies periodically, so phase relationships become essential when current passes through a resistor, capacitor or inductor. The chapter distinguishes resistance from capacitive and inductive reactance, explains phase lead and lag, and connects changing electric and magnetic fields with the production and properties of electromagnetic waves.
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