Link to our latest notes and resources: https://drive.google.com/drive/u/2/folders/15Ld6KabsL9x9X-t4GefBgSzXFDckJFa6 4.2.2 Electrical current 1 2 3 Define electric current as the charge passing a point per unit time; recall and use the equation electric current = charge time I = Q t Describe electrical conduction in metals in terms of the movement of free electrons Know that current is measured in amps (amperes) and that the amp is given by coulomb per second (C / s) 4 Know the difference between direct current (d.c.) and alternating current (a.c.) 5 State that conventional current is from positive to negative and that the flow of free electrons is from negative to positive 6 Describe the use of ammeters (analogue and digital) with different ranges 4.2.3 Electromotive force and potential difference 1 22 e.m.f. = Define e.m.f. (electromotive force) as the electrical work done by a source in moving a unit charge around a complete circuit; recall and use the equation work done (by a sou

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