21-11-2018, 05:45 PM
Andy, I just crunched the numbers in your simulation from first principles and got small differences from your numbers
203.8
258.2
280.3
286.8
288.5
288.9
Your currents are about 2 or 3mA larger.
Very odd.
Trevor, I can't make your numbers add up. Again from first principles.
X = 1/(2*PI*4e-6*50) = 796R
R(cold) = 90
Z (cold) = SQRT( 792^2 + 90^2) = 801 ohms
I = 235/801 = 293mA
That's the cold current.
The hot resistance of the chain should be 165/.3 = 550R. This gives a current of 243mA.
203.8
258.2
280.3
286.8
288.5
288.9
Your currents are about 2 or 3mA larger.
Very odd.
Trevor, I can't make your numbers add up. Again from first principles.
X = 1/(2*PI*4e-6*50) = 796R
R(cold) = 90
Z (cold) = SQRT( 792^2 + 90^2) = 801 ohms
I = 235/801 = 293mA
That's the cold current.
The hot resistance of the chain should be 165/.3 = 550R. This gives a current of 243mA.
www.borinsky.co.uk Jeffrey Borinsky www.becg.tv
