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Here are some general formulae for working out values in an A.C. circuit:
Resistors are exactly the same as in D.C. circuits
I = V / R P = I2R
I = V / XC
XC is the capacitive reactance = 1 / (2pfC)
f is the frequency, C is the capacitance
(Remember Voltage lags Current by 90o)
I = V / XL
XL is the inductive reactance = 2pfL
f is the frequency, L is the inductance
(Remember Voltage leads Current by 90o)