# Amateur Extra Lesson 7.1, AC Waveforms and Measurements, 11th Edition

Here’s your video introduction to Section 7.1, “AC Waveforms and Measurements,” from the 11th Version of the ARRL Extra Class License Manual for Ham Radio.

You can find a complete list of the Amateur Extra videos by clicking here, or click here to go to the YouTube Amateur Extra playlist. Please post your questions either below or on the YouTube page for this video. Good luck in your studies!

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### 2 Responses to Amateur Extra Lesson 7.1, AC Waveforms and Measurements, 11th Edition

1. Dave says:

E = I x R
P = E x I
substituting, P= I x I x R = I^2 x R, so I squared R.

2. injunear says:

Time 14:52

Am I misunderstanding the power equation, or should it be P = I squared over R? Or perhaps I am confusing it with P = I squared R?

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