AC circuit equations

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Inductive reactance


XL = 2πfL  
 


Where,
    XL = Inductive reactance in ohms
    f = Frequency in hertz
    L = Inductance in henrys



Capacitive reactance


XC = 1
2πfC


Where,
    XC = Capacitive reactance in ohms
    f = Frequency in hertz
    L = Inductance in henrys



Impedance in relation to R and X


ZL = R + jXL  
 
ZC = R - jXC  
 





Ohm’s Law for AC


E = IZ  
 
I = E
Z
Z = E
I


Where,
    E = Voltage in volts
    I = Current in amperes (amps)
    Z = Impedance in ohms