Good question
Thanks for your question. I don't know how to determine the difference. I just go by what the label on the microwaves say. They don't tell me what is electrical power and what is cooking power.
The 1500W label says "input 120V, 60 Hz single phase 1500W" then under that it says "output 950 W 2450 MHz".
The 900W says "120 Vac 60Hz 1350W 900W frequency 2450MHz.
I don't know how to decipher all of that into what is cooking power and what is electrical power of each of them. Can you?
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