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i have an assigment involving modelling conductors, semiconductors and insulators, how they work etc. i dont really get how they work in the first place though my textbook isnt very clear. could someone explain to me in human language how they work and what they do? the movement of...

just a question to some of you more experienced members. im doing okay in 5 of my units. but my other 7 im not doing so well in and ive screwed up two rounds of assessments now, probably 40% of the assessment mark overall. when i say screw up i mean <50% for them. is it now impossible for me...