U = Spänning (volt)
U=R*I , U=P/I , U=√(R*P)
I = Ström (ampere)
I=U/R , I=P/U , I=√(P/R)
R = Resistans (ohm)
R=U/I , R=P/I2 , R=√(U2/P)
P = Effekt (watt)
P=U*I , P=U2/R , P=R*I2
Ohms lag
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