This document discusses the International System of Units (SI) and its use of base units, derived units, multiples, and submultiples to describe electrical measurements. It explains that the six base SI units are the units of length, mass, time, temperature, electric current, and luminous intensity. Derived units are formed by combining the base units and include units like voltage, resistance, and capacitance. The document also covers converting between standard and scientific notation to represent numbers in a more convenient form.