🔍 Key Concepts
• Harmonic currents and how they add to form an actual line current waveform
• Difference between fundamental frequency and its harmonic components (3rd, 5th, 7th, etc.)
• How to read the labels on figure B to see which individual waveforms are being combined
💭 Think About
• Look closely at figure B: Which individual sine waves are explicitly drawn and labeled underneath the actual line current waveform?
• When several harmonic currents are present, is the fundamental frequency usually included in the description of the line current, or are only the harmonics listed?
• Are any even-numbered harmonics (2nd, 4th, 6th) actually shown or labeled in the figure, or are they all odd-numbered?
✅ Before You Answer
• Identify each separately drawn waveform in figure B and list its frequency order: fundamental, 3rd, 5th, 7th, etc.
• Confirm whether even harmonics (2nd, 4th, 6th) appear anywhere in the figure or in the labels
• Make sure your choice includes all and only the frequency components that are visibly contributing to the ‘Actual line current’ curve in the illustration