Deep Dive: E5D09
The correct answer is B: Energy is stored in magnetic or electric fields, but power is not dissipated. What happens to reactive power in ideal inductors and capacitors is that energy is stored in magnetic or electric fields, but power is not dissipated. Reactive power stores energy but doesn't dissipate it. For amateur radio operators, this is important for power theory. Understanding this helps when calculating power.
Why Other Answers Are Wrong
Option A: Incorrect. Dissipated as heat isn't correct - reactive power stores energy, doesn't dissipate. Heat dissipation is wrong. Option C: Incorrect. Canceled by Coulomb forces isn't correct - reactive power stores energy in fields. Coulomb forces isn't the mechanism. Option D: Incorrect. Dissipated in formation of fields isn't correct - reactive power stores energy, doesn't dissipate. Field formation dissipation is wrong.
Exam Tip
Reactive power in ideal L/C = energy stored in fields, power not dissipated. Think 'R'eactive 'P'ower = 'R'eturns 'P'eriodically (stores, doesn't dissipate). Reactive power stores energy but doesn't dissipate it. Not heat dissipation, not Coulomb forces, not field formation dissipation - just energy storage, no dissipation.
Memory Aid
Reactive power in ideal L/C = energy stored in fields, power not dissipated. Think 'R'eactive 'P'ower = 'S'tores, 'N'ot 'D'issipated. Reactive power stores energy but doesn't dissipate it. Important for power theory.
Real-World Example
Reactive power in ideal inductors and capacitors: Energy is stored in magnetic or electric fields, but power is not dissipated. The energy oscillates between the fields but is not lost as heat. This is what happens - energy storage, no dissipation.
Source & Coverage
Question Pool: 2024-2028 Question Pool
Subelement: E5D
Reference: 2024-2028 Question Pool · E5 - Electrical Principles
Key Concepts
Verified Content
Question from the official FCC Extra Class pool. Explanation reviewed by licensed amateur radio operators and mapped to the E5D topic.