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I have an exam coming up that needs me to design a few circuits and then test them. How would I work out the design current of a sub board from the main board?

I’m currently working though the access training course. I’ve just finished the practical training and will be booking the practical exam soon. Does anyone have any knowledge about this course and what to expect? Also, how useful will these certificates be for me gering work? What other courses...

I wonder if I could ask general past paper questions that I’m stuck on?    I can’t figure out the formula that will work out the voltage drop I’m sure it’s something simple, some help would be greatly appreciated 😃