ABSTRACT
At the end of this chapter, you should be able to:
• state the seven SI units • understand derived units • recognise common engineering units • understand common prefixes used in engineering • express decimal numbers in standard form • use engineering notation and prefix form with engineering units
Of considerable importance in engineering is a knowledge of units of engineeringquantities, the prefixes used with units, and engineering notation. We need to know, for example, that
80kV = 80× 103V, which means 80000 volts and 25mA = 25× 10−3A, which means 0.025 amperes
and 50nF = 50× 10−9 F, which means 0.000000050 farads
This is explained in this chapter.
