When I was first getting into reading and using electrical formulas, the hardest thing that I had to remember is what the symbols "E", "I" and "P" stood for.
Why not just call them Voltage and Current and Wattage? V, C and W.
I finally grasped the thinking when I read somewhere that the letter "I" was used for amperage because, way back...at first.... when looking for a way to describe current, the word "Intensity" was used.
After hearing that, I didn't have to sit and ponder just what "I" stood for.:roll:
Seriously, I had a mental block and could not remember what the symbols stood for.
Now that I knew I and R (Resistance is easy), all I had to do was remember that "E" stood for Electromotive Force...... Energy........ Voltage.
After that, simple deduction left "P" for wattage.
Waaaay back, my father (Navy Radioman in WWII...Destroyer in the Pacific and later a Mechanical Engineer in civilian life) taught me OHM's law for DC circuits.
He used the words Volt, Amp, Resistance and Watt so that I could learn.
I understood how it worked, but I didn't memorize the symbols.
The important thing (in my mind) is learning how electricity works, and understanding how Voltage (E) and Resistance (R) determine how much Current flows (I) and the amount of power delivered...Wattage (P).
1 Volt will push 1 Amp of current across 1 OHM of resistance and deliver 1 Watt of power.
By using interpolation, any of the (single) values can be determined by knowing any of the other two.
I know...we all know that, and I'm leaving a lot out ....but I'm trying to help the OP make it through the test.
If it's anything like the (two) CE tests that I've taken and passed, this is all you will need....as far as this part goes anyway.
If you will learn how it works (I'm not saying that you don't already), and memorize the symbols, you shouldn't have a problem.
When you first sit down to take the test, write down the symbols and what they represent.
Also, write down all of Ohm's Law that you can remember.
If you can get down one part of the formula, the rest should be easy.
I probably made a error or two in my descriptions, but what I know, I learned by experience, self study and of course...my dad.
I didn't go to school to be a electrician, so my technical terminology may be lacking.
My advice on taking the test.
First....Relax, you know this stuff, just answer the question.
The questions are written to confuse you, and most of the time they will have a lot of un-necessary information.
Look for the true question in all of the words, and answer it.
Second....Answer all of the questions that you know the answers to, and mark the others to return to later.
Third.....Answer the questions that you're pretty sure of, but just need to check the book.
Fourth....Answer the questions that you are not sure of, but have a good idea of what the queston is asking, and can come to a answer.
Then compare it to the available answers, and pick the one closest to your answer.
Fifth....If you can't do a problem....Guess.
Wrong answers don't count against your score, and you might get lucky.
Hope this helps
steve