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dane:
R = 0,12 Ω
I = 0,25 A
szukane:
U = ?
I = U/R I*R
U = I * R
U = 0,25A * 0,12Ω
U = 0,03 V = 30 mV
2.
R = 30 000 Ω = 30 kΩ
I = 20 mA = 0,02 A
U = 2 mV = 0,000002 kV