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Power factor (PF) is calculated and PF=cos(phi) where phi is the phase angle of the current running through a load. To find the phase angle of the current, one must know the voltage drop across the load and the total impedance (capacitance + resistance) of the load and then use Ohm's Law to find the current. The total impedance of a capacitor is 1/(j*w*C) where j = sqrt(-1), w = 2*pi*f (f = frequency), and C is the capacitance.

To find the correct value of capacitance for a PF of 0.9 lag, you need to know the total impedance of the load which includes the value of the resistance and the configuration of the load (parallel, series, or some combination).

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Q: How you can calculate capacitor bank value to correct pf to 0.9 lag?
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