🔍 Key Concepts
• Harmonics in AC (alternating current) and RF (radio frequency) systems
• Relationship between a fundamental frequency and its higher-frequency components
• Difference between frequency, impedance, power factor, and heating value
💭 Think About
• When you have a signal at some base (fundamental) frequency, what do engineers mean when they talk about its harmonics?
• Which choice clearly talks about frequency itself, not about power, impedance, or heating?
• In basic electrical theory, how are 2nd, 3rd, 4th ... harmonics typically described compared to the original signal?
✅ Before You Answer
• Identify which option directly refers to frequency rather than power or impedance-related ideas
• Eliminate any choices that deal mainly with power factor or impedance, since those are separate concepts from harmonics
• Confirm that the remaining choice correctly describes harmonics as being related to the fundamental (original) frequency in a simple integer way