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           Some Simple Facts         

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Some simple facts that you can carry in your head
 
 
Wavelength
 
The speed of sound is roughly one foot per millisecond.
 
So at 1kHz, a single wave is about one foot long.  At 500Hz, it is two foot long.  At 250Hz it is 4 ft.  At 125Hz, it is 8 ft long - and so on.
 
 
Middle A
 
Middle A is 440Hz.
 
 
BPM
 
You can calculate beats per minute with stop watch and count off four bars, starting and finishing on the 'one.' Call the time taken by those four bars T then the calculation is

16 / T  x  60  =  bpm

So if we tap off 16 in eight seconds, then 16 / 8 = 2 and 2 x 60 =  120.

If we tap off 16 beats in 10 seconds, then  the calculation is

16 / 10  x  60  =  96bpm.


 
Ohms Law
 
Voltage is Current times Resistance  (V = I x R)
 
 
The Power Law
 
Power is Voltage times Current  (P = V x I)
 
so  Wattage is Voltage multiplied by Ampage.

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