Posted by MarkB_MI on May 25, 2011 at 19:29:57 from (166.203.148.20):
In Reply to: OT: Ham radio licence. posted by doug in illinois on May 25, 2011 at 18:33:17:
Electrical engineering has always used metric units. Only a few english units are used (mainly horsepower and Btu), and none of those are used in electronics. Volt, amp, watt, ohm, farad, and henry are all metric units and have no english equivalent.
I don't think you're so concerned with the metric units (which you already use) as you are of scientific notation, or more specifically "engineering notation", where exponents are always multiples of three.
All you need to know was covered in high school algebra, which you probably took but just don't remember. If you have problems with scientific notation, pick up a high school algebra textbook, it will have all you need to know.
Consider this: Calculators that can handle scientific notation are relatively new devices, the first ones came out in the early 70's. Before that, engineers used slide rules, and slide rules can't handle exponents at all. Only the mantissas of the operands are used with a slide rule; exponents must be calculated on paper or in the engineer's head.
Knowing how to do scientific notation will help you take the test, but I'd still recommend you plunk down for a "scientific" calculater. Scientific calculators can normally handle numbers between 10-99 and 10+99. A good scientific calculator will run around 30 bucks.
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