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I = U / R
Z tego wyliczam R:
R = U / I
Podstawiam kolejne dane z tabeli do wzoru:
1 . R1 = U1 / I1 = 1,5V / 140mA = 1,5V / 0,14A = 10,7 Ω
2. R2 = U2 / I2 = 3V / 300mA = 3V / 0,3A = 10,0 Ω
3. R3 = U3 / I3 = 4,5V / 460mA = 4,5V / 0,46A = 9,8 Ω
4. R4 = U4 / I4 = 6V / 600mA = 6V / 0,6A = 10,0 Ω
Odpowiedź C - żarówka ma 10 Ω