14 letter b 00ACTIVE, REACTIVE, AND APPARENT POWER159b line current I is shown as entering bya. The reactive power absorbed by the reactorb. The apparent power absorbed by the reactorc. The peak power input to the reactord. The peak power output of the reactore. The duration of each positive power pulseterminal a.Otherwise, the device is a reactive source.Based on these rules, and observing the phasor rela-tionships in Fig. 23, we deduce that device A is an ac-tive source because I, is 180° out of phase with E.Also, device A is a reactive load because I lags11 Using the rules given in Sections 16 and17, determine which of the devices in Fig.24a through 24f acts as an active (or reac-tive) power source.90° behind Eab.12 A single-phase motor draws a current of 12 Aat a power factor of 60 percent. Calculate thein-phase and quadrature components of cur-rent I, and I, with respect to the line voltage.Questions and ProblemsPractical levelWhat is the unit of active power? reactive1.power? apparent power?A single-phase motor draws a current of16 A from a 240 V, 60 Hz line. A wattmeterconnected into the line gives a reading of2765 W. Calculate the power factor of themotor and the reactive power it absorbs.ER13A capacitor of 500 kvar is placed in parallel2.with an inductor of 400 kvar. Calculate theapparent power of the group.Name a static device that can generate reac-3.tive power.If a capacitor having a reactance of 30 N isconnected in parallel with the motor ofProblem 13, calculatea. The active power reading of the wattmeterb. The total reactive power absorbed by thecapacitor and motorc. The apparent power of the ac lined. The line current14Name a static device that absorbs reactive4.power.What is the approximate power factor, inpercent, of a capacitor? of a coil? of an in-candescent lamp?The current in a single-phase motor lags 50°9.behind the voltage. What is the power factore. The power factor of the motor/capacitorcombinationof the motor?Using only power triangle concepts(Section 14) and without drawing any pha-1 sor diagrams, find the impedance of the cir-cuits in Fig. 25.An induction motor absorbs an apparent15Intermediate levelA large motor absorbs 600 kW at a power fac-tor of 90 percent. Calculate the apparent powerand reactive power absorbed by the machine.power of 400 kVA at a power factor of80 percent. Calculatea. The active power absorbed by the motorb. The reactive power absorbed by the motorc. What purpose does the reactive power serveA 200 µF capacitor is connected to a 240 V,60 Hz source. Calculate the reactive power itgenerates.A 10 N resistor is connected across a 120 V,60 Hz source. Calculatea. The active absorbed by the resistorb. The apparent power absorbed by the resistorc. The peak power absorbed by the resistord. The duration of each positive power pulse17 A circuit composed of a 12 2 resistor in se-ries with an inductive reactance of 5 Q car-powerniries an ac current of 10 A. Calculatea. The active power absorbed by the resistorb. The reactive power absorbed by the inductorc. The apparent power of the circuitd. The power factor of the circuit10 A 10 Q reactance is connected to a 120 V,60 Hz line. Calculate

Question

Accepted Answer

It is given that:
V=240 VI=16 Af=60 HzP=2765 WXc=30 Ω