Copyright: 1996 - 2024
BSEE - KB3UON
RF Cafe began life in 1996 as "RF Tools" in an AOL screen name web space totaling
2 MB. Its primary purpose was to provide me with ready access to commonly needed
formulas and reference material while performing my work as an RF system and circuit
design engineer. The World Wide Web (Internet) was largely an unknown entity at
the time and bandwidth was a scarce commodity. Dial-up modems blazed along at 14.4 kbps
while typing up your telephone line, and a nice lady's voice announced "You've Got
Mail" when a new message arrived...
All trademarks, copyrights, patents, and other rights of ownership to images
and text used on the RF Cafe website are hereby acknowledged.
My Hobby Website:
Riddle Me This, Riddler
Kirt's Cogitations™ #201
Riddle Me This, Riddler
Riddle me this, Riddler: When is a search engine not a
search engine? Ans: When it is a calculator. Batman might have asked just
that question after learning of the amazing calculator and units conversion facility
that is built into the Google search engine. As an avid Google user, I have
noticed occasionally that I would do a search for some numerical or units related
topic and the result would include a simple, unexpected calculation with an answer
at the top. Since it happened again recently, I did a little investigation and discovered
that indeed there is a very extensive calculator built into Google.
your favorite browser, go to Google and type in "10 ohms * 5 milliamps" and watch
the result: "(10 ohms) * 5 milliamperes = 0.05 volts" Neat, non? Now, type in "10
ohms * 5 milliamps in millivolts " for a result of "(10 ohms) * 5 milliamperes =
50 millivolts ." Neat again. Now for an inane example of how it will present in
any (valid) format. Do, "10 ohms * 5 milliamps in milliohms picoamperes " to yield
"(10 ohms) * 5 milliamperes = 5.0 × 1013 milliohms picoamperes ."
Of course, the calculator is not limited to electrical calculations. With built-in
units like stones, cubits, grains, sidereal years, baker's dozen, and scores, there
is a good chance the Google calculator will calculate and/or convert just about
anything you need. Anyone who has taken a college physics course has been challenged
to do the old "furlong per fortnight" conversion when solving a speed/velocity problem.
Your $100 HP or Casio calculator might not have the units built in, but let us give
Google a try. Do "c in furlongs per fortnight," and voila, Google gives you, "the
speed of light = 1.8026175 × 1012 furlongs per fortnight."
I mention the built-in physical constants? Yup, as in the last example, Google knows
that "c" is for the speed of light. It knows that: "the speed of light = 299 792
458 m / s," when typing in just the letter "c." Want Boltzmann's constant?
Type in "k" to get "Boltzmann constant = 1.3806503 × 10-23 m2
kg s-2 K-1." Need the elementary charge of an electron? Type
"electron charge" to get "elementary charge = 1.60217646 × 10-19 coulombs."
"eV" returns, "1 electron volt = 1.60217646 × 10-19 joules." Want that
answer in watt*seconds? No problem, just type "eV in watt seconds" to get "1 electron
volt = 1.60217646 × 10-19 watt seconds." Of course, the units are equivalent
(1 joule = 1 watt*sec) so the number is the same, but you get the picture. A couple
more to amaze you: "epsilon_0" returns "electric constant = 8.85418782 × 10-12
m-3 kg-1 s4 A2." Type "G" for "gravitational constant = 6.67300 × 10-11
m3 kg-1 s-2." You gotta love it.
there's more. Google calculator can convert between numerical bases, too. Easy example:
"0b100000 in octal" yields "0b100000 = 0o40." 0b100000 in hex " yields "0b100000
= 0x20." How about this for you: "CLXII in decimal" converts from Roman numerals
to decimal, "CLXII = 162." If you would like that answer in binary, then here it
is, "CLXII = 0b10100010." By the way, it also does the mundane calculations like
trigonometry functions, factorials, roots and powers, logarithms, modulo, etc. Even
complex math is no sweat "(1i + 1) * (2i + 3)" gets you "((1 * i) + 1) * ((2 * i)
+ 3) = 1 + 5 i."
So, the next time you need a quick, easy utility to perform
a calculation and/or units conversion, just fire up Google . As with so many other
realms, the engineers there have managed to seize an opportunity and improve upon
it. The Google calculator out-features the majority of the online and stand-alone
versions out there. How much better is it? Maybe "1 googol = 1.0 × 10100"