R=U/I
R=3В÷0.25A=12 Ом
R=1В÷0.25A=4 Ом
R=4В÷0.25A=16 Ом
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R=U/I
R=3В÷0.25A=12 Ом
R=1В÷0.25A=4 Ом
R=4В÷0.25A=16 Ом