Instead of saying 3,200,000,000 Hertz, you can say 3.2 GigaHertz, or 3.2 GHz for shorthand written notation. These above prefixes dramatically help describe quanities of units in large amounts. While these prefixes cover a rang of 10 -3 to 10 3, many electronic values can have a much larger range. However, as you'll soon see, when learning about electronics and computer science, the range of prefixes well exceeds the standard six. You may have even learned a fun mnemonic to go along with these such as Kangaroos Have Dirty Underwear During Cold Months. These are what we'll consider the standard six prefixes taught in most High School science courses. When first learning about metric prefixes, chances are you were taught these six prefixes first: Prefix (Symbol) Now that we know the units, let's look at how they can be augmented with prefixes to make them even more usable! In dealing with electronics, there are a handful of units we'll be encountering more often than others. Using the units above means everyone is speaking the same language. While we can still use units like feet or miles for distance (instead of meters), liters to describe volume (instead of m 3), and Fahrenheit or Celsius to describe temperature (instead of °K), the units above are a standardized way for every scientist to share their measurements. This standardized system has come to be called the \ International System of Units \, abbreviated SI. In order to better communicate measurements, we needed a standardized system of units, which every scientist and measurer could use to share their findings. For example, length can be measured by the foot, meter, fathom, chain, parsec, league, and so on. ![]() There are now dozens of units to describe physical quantities. ![]() ![]() We've been measuring stuff for millennia, and our units used for those measures have been evolving since then.
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