021
De transformator is verliesvrij.
Als de schakelaar in stand 1 staat, is de stroom door de ampêremeter 9 ampêre.
Zetten we de schakelaar in stand 2, dan is de stroom door de ampèremeter:
a 1,5 A
b 3 A
c 4.5 A
d 9 A
P = P Up * Ip = Us * Is
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n = Is/Ip
n= 1/3 =0.33
stand 1
Is = n * Ip = 0.33 x 9 = 3 A
stand 2
Is = 1.5 A
Ip = Is /n = 1.5 / 0.33 = 4.5 A
n = np/ns n = Up/Us n = Is/Ip n2 = Zp/Zs n2 = Cs/Cp
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