--schakelaar open--
P2 = P1 = 25 Watt want R1=R2
Pt = 2 x 25 = 50 Watt
P = U x I >>>
I = P / U = 50 : 100 = 0.5 A
U = I x R >>>
Rt = U / I = 100 : 0.5 = 200 Ohm
R1 = 100 Ohm en R2 = 100 Ohm
Ur = Ir x R 0.5 x 100= 50 V
---schakelaar gesloten---
R1 vervalt , wordt kortgesloten
I = U / R 100 : 100 = 1 A
P = U x I 100 x 1 = 100 Watt
Ur2 = IR2 x R2 = 1 x 100 =100 V
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