Before we begin our exploration of electronics, we need to talk about units of measurement. A unit of measurement is basically a standard against which we are measuring something. For instance, when measuring the length of something, the units of measurement we usually use are feet and meters. You can also measure length in inches, yards, centimeters, kilometers, miles, and so on. Additionally, there are some obscure units of length like furlongs, cubits, leagues, and paces.
Every type of quantity has its own types of units. For instance, we measure time in seconds, minutes, hours, days, ...
