P1=U1*I1 = 10W
U1 = 24V
I1 = P1/U1 = 5/12 A
R = U1 / I1 = 24 / 5/12 = 24 * 12/5 = 288/5 = 57.6 om
b)
U2 = 12V
R = 57.6 om = U2/I2 --> I2 = U2/R
P2 = U2*I2 = U2 * U2/R = (U2)^2/R = 12^2/57.6 = 144/57.6 = 2.5W
ΔP = P2 -P1 = 2.5-10 = -7.5W
Moc zmaleje o 7.5 W
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P1=U1*I1 = 10W
U1 = 24V
I1 = P1/U1 = 5/12 A
R = U1 / I1 = 24 / 5/12 = 24 * 12/5 = 288/5 = 57.6 om
b)
U2 = 12V
R = 57.6 om = U2/I2 --> I2 = U2/R
P2 = U2*I2 = U2 * U2/R = (U2)^2/R = 12^2/57.6 = 144/57.6 = 2.5W
ΔP = P2 -P1 = 2.5-10 = -7.5W
Moc zmaleje o 7.5 W