Posted by Edwin on Tuesday, March 16, 2010 at 12:33pm.
Delivered power is a maximum when the internal and external resistances are equal, as I recall. Therefore
Rexternal(optimum) = 10 ohms.
Current with that external resistance
= V/Rtotal = 24/20 = 1.2 Amps
Maximum power produced in external resistor =
I^2*Rexternal = (1.2)^2 * 10 = 14.40 W
Check: If I use Rexternal = 11 ohms instead, Rtotal = 21 ohms and I = (24/21) = 1.143 A
I^2 * Rext = 14.37 W
If you use Rexternal = 9 ohms, your will still get a power less than 14.4 W
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