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Old 26th September 2009, 10:58 AM   #11
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Quote:
Originally Posted by AndrewT View Post
if you can remember that
I = V / R - Ohm's law
and that
P = I * V
then all the others follow exactly from those two equations.
No reason to be either lazy nor stupid.
But frequent repetition may well be required to commit this to permanent memory, for it to stick. Just like a PC:- RAM is volatile and HDD can be almost permanent, if we know where the index to the library/files is kept.
My memory is extremely volatile.

It took a long time to get this image burned into my EEPROM.....

Click the image to open in full size.

Last edited by theAnonymous1; 26th September 2009 at 11:03 AM.
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Old 26th September 2009, 12:17 PM   #12
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Quote:
The formula is:

P[RMS] = Ec^2/(8*Rl) where:

P is the RMS power in watts

Ec is the supply voltage. In your case, is either 10V or +/-5V=10V (same thing)

Rl=Load resistance in ohms.

In your case, the RMS power is 10^2/(8 * 10) = 1.25W
There exists no such thing as RMS watt
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Old 26th September 2009, 03:35 PM   #13
wwenze is offline wwenze  Singapore
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Quote:
Originally Posted by theAnonymous1 View Post
My memory is extremely volatile.

It took a long time to get this image burned into my EEPROM.....

Click the image to open in full size.
Strange, I had P = V * I etched into my brain since I was a child. Must be my father showing me the utility bill.
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Old 26th September 2009, 06:02 PM   #14
AndrewT is offline AndrewT  Scotland
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Quote:
Originally Posted by wwenze View Post
Strange, I had P = V * I etched into my brain since I was a child. Must be my father showing me the utility bill.
yes that's what it says.
P=I*E
I=P/E
E=P/I

where
P=power
I=rms current
E=rms voltage
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regards Andrew T.
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