Electric current is the rate at which charge flows through a surface. Electric current is often just called current. The SI unit of current is the ampère [A]. The essential topics definitions of resistance, conductance, drift velocity, cell EMF, resistivity, conductance, Confines of Ohm’s Law, Electric Circuits and Kirchhoff’s Rules and internal resistance. The graphing of resistivity for metals, semiconductors and alloys must be practised thoroughly. The conversion of complex circuits into simple series and parallel circuits must be well versed.