@kvk perfect; thanks that’s what I was after… I always read before asking - in this case I clearly started further down the path than I was ready for and am backtracking as far as needed (to be honest I have a thread in my notes on what is voltage? as I always pictured it as a pushing force, rather than a difference in energy which was a clear misconception… and hence I am asking myself what else have i missed!)
it needs not be said, I am not sure what happened over the last 15 years since I left college! but if you don’t use it, you forget it? or as a 21 year old I just accepted everything i was told and focussed on telling the teacher what they wanted to hear and passing the exam!