Answer Posted / pradhyumn
Ideal Power factor is 1.
It is ratio of real power(measured in watts) flowing to the
load to apparent power(measured in VA). It ranges between 0
to 1.
P.F. is a measure of the degree to which a given load
matches to that of a pure resistance.
P.F.=1 if load is purely resistive.
P.F.=0 if load is inductive or capacitive or both.
For RL-circuit P.F. is between 0&1.(lagging)
For RC-circuit P.F. is between 0&1.(leading).
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1- XC and the RC time constant are both measures of the reaction of C to a change in ____? 2-The power factor is a numerical ratio with a value between 0 and 1 equal to the ______________ of the phase angle. 3-When V and I are out of phase because of reactance, the product of V times I is called ______________ power 4-For _____________ inductors, the branch currents can be added algebraically. 5- The ______________ power in watts can be calculated as I^2R 6-Calculate XL with L = 30mH and f = 1kHz ( I have Xl=2piFL 2*3.141592653*1kHz*30mH =188 ohms Please check) 7-A parallel RL circuit has the values, R = 5kohms, XL = 5kohms. A voltage source of Vt = 10Vrms is connected in parallel to R and L. Determine the total current, It delivered by the voltage source Vt. 8-A series RC circuit has R = 1Mohm and C = 1microF. How long would it take for the capacitor to fully discharge if it is initially fully charged? 9-A circuit has real power = 300W and an apparent power of 500VA. Determine the power factor and phase angle. 10-The time constant for an LR series circuit is T = 0.1s and R = 10ohms. Calculate the inductance L.
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