A 1,000-W electric motor is connected to a sourceof 120 Vms, 60 Hz, and the result is a lagging pf of 0.8.To correct the pf to 0.95 lagging, a capacitor is placedin parallel with the motor. Calculate the current drawnfrom the source with and without the capacitorconnected. Determine the value of the capacitorrequired to make the correction.

A 1,000-W electric motor is connected to a sourceof 120 Vms, 60 Hz, and the result is a lagging pf of 0.8.To correct the pf to 0.95 lagging, a capacitor is placedin parallel with the motor. Calculate the current drawnfrom the source with and without the capacitorconnected. Determine the value of the capacitorrequired to make the correction.

Delmar's Standard Textbook Of Electricity

7th Edition

ISBN:9781337900348

Author:Stephen L. Herman

Publisher:Stephen L. Herman

Chapter24: Resistive-inductive-capacitive Parallel Circuits

Section: Chapter Questions

Problem 1RQ: An AC circuit contains a 24 resistor, a 15.9-mH inductor, and a 13.3F capacitor connected in...

See similar textbooks

Similar questions

An AC circuit contains a 24 resistor, a 15.9-mH inductor, and a 13.3F capacitor connected in parallel. The circuit is connected to a 240-V, 400-Hz power supply. Find the following values. XL=XC=IR=AIL=AIC=AP=WVARsL=VARsC=IT=AVA=PF=%=
An industrial load consisting of a bank of induction motors consumes 50 kW at a power factor of 0.8 lagging from a 220-V,60-Hz, single-phase source. By placing a bank of capacitors in parallel with the load, the resultant power factor is to be raised to 0.95 lagging. Find the net capacitance of the capacitor bank in F that is required.
Three capacitors having capacitance values of 20F,40F, and 50F are connected in parallel to a 60 - Hz power line. An ammeter indicates a circuit current of 8.6 amperes. How much current is flowing through the 40F capacitor?
An AC circuit contains a 24-Ω resistor, a 15.9-mH inductor, and a 13.3-µF capacitor connected in parallel. The circuit is connected to a 240-V, 400-Hz power supply. Find the following values. P = I2 / R = VARsL = √VA squared - P squared = VARsC = VARsL(present) - VARsL(needed) =
A 240 Vrms source drives a load equivalent to a 10 Ω resistor in parallel with a 50 mH inductor. The frequency of the source is 60 Hz. Design the value of the appropriate capacitance to produce a power factor of 1.
Q.4Determine the current flowing in the capacitor(-j25ohm) and its direction as shown in Figure below. Assume the voltage source to have negligible impedance.
A small capacitor of 100 pF is charged by a steady current of 1 µA for 1 ms. At that time, the charging circuit is disconnected. a) What is the voltage across the capacitor when the charging finishes? b) A 10 MΩ resistor is connected across the capacitor to discharge it. Sketch a graph of the voltage V across the resistor as a function of time, with appropriate numbers and units marked on the axes.
The capacitor has been added to the load in the circuit shown in figure below to maximize the power absorbed by the 4000-V resistor. What value of capacitance should be used to accomplish that objective?
A 5-ohm resistor is connected in series with a 25 micro-farad capacitor. A source voltage of158 volts, 50 Hz supplies the combination. Determine the following:a. Circulating currentb. Voltage across the resistorc. Voltage across the capacitord. Real power supplied by the source
a) Find the mathematical expression for the voltage VR (t).b) Calculate the reactive power on the capacitor.
a) Find the mathematical expression for the voltage VR (t). b) Calculate the reactive power on the capacitor
The shunt winding of a machine has a resistance of 80 ohms and an inductance of 4 H is suddenly switched on to a 220-V supply. Find the time taken for the current to rise to half its steady state value.