Using only the no-load and load voltage ...

[Archangel]

... is it possible to determine the mA draw of a circuit? I thought i ran across a formula for it once, but when i went back to verify i couldn't find it.

 

[Lynx_Arc]

It is possible to determine the current draw of a circuit if the specs of all components and power source are known.
Ohms Law works if it is a simple circuit involving voltage, and a known resistance. E=IR or where E=volts I=amps or current and R=resistance. You can transpose the formula to make I=E/R to find current.

 

[andrewwynn]

I think you are talking about determining the internal resistance of a battery or power supply.. you have to know more than just the voltage difference of a circuit to know pretty much anything.. other than the voltage /ubbthreads/images/graemlins/wink.gif

-awr

 

[chimo]

If you knew the internal resistance of the battery, you could make a swag at the current, but there are much easier (and more accurate) ways of measuring the current.

Paul