There isn't any one formula that covers all that you need to know for your amateur extra license.
The most basic formula is Ohm's Law.
In order to understand each question - you need to take and do some research - why this is a question and why the answer is what it is.
The questions are on the test to teach you something.
There is only one math question - and if you get all the other questions right - then you can miss the one math question. 50 - 1 - 98%




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