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Jan 6, 2021 at 16:11 comment added JRE You can calculate power from impedance and voltage - if you know the impedance accurately. Impedance is often not as simple as you might think - a coil can have large variations just over the audio range. There are AC power meters out there that cover the audio range. Expect them to be expensive. You might be able to rent them.
Jan 6, 2021 at 16:03 comment added chmike Thank you for the advise. I’ll then use an oscilloscope to measure the voltage. How do I determine the power from it ? Am I required to measure the current ? Can’t it be deduced from V and the impedance of the coil ?
Jan 6, 2021 at 15:54 history answered JRE CC BY-SA 4.0