Determine capacitance of capacitor, Electrical Engineering

Determine Capacitance of capacitor:

A 20 Ω resistor is connected in series with a coil, a capacitor and an ammeter across a 25 V variable frequency supply. While the frequency is 400 Hz, the current is at its maximum value of 0.5 A and potential difference across the capacitor is 150 V. Determine:

1. Capacitance of capacitor, and

2. Resistance and inductance of coil.

1899_Determine Capacitance of capacitor.png

Figure

Solution

 (a) Let capacitance = C farad

Resonant frequency, f0 = 400 Hz

Capacitive reactance, X C =1 / ωC =   1 / (2π × 400 × C) = (1/800π × C) Ω

Voltage across capacity = Im XC = 150 V

                                         Im = 0.5 A

∴          0.5 / 800π C = 150

    C =   0.5 / (800 ×π × 150)

= 1.3263 × 10- 6 F

or         C = 1.3263 μF

 (b)       Let, RL and L be the resistance and inductance of coil respectively

Current, I m      =          V/ (R + RL)

                    0.5 = 25 / 20 + RL (?Applied voltage V = 25 V)

                        RL = 30 Ω

Posted Date: 2/5/2013 1:53:20 AM | Location : United States







Related Discussions:- Determine capacitance of capacitor, Assignment Help, Ask Question on Determine capacitance of capacitor, Get Answer, Expert's Help, Determine capacitance of capacitor Discussions

Write discussion on Determine capacitance of capacitor
Your posts are moderated
Related Questions
Analysis of diode circuits

An induction motor takes 350 kW at 0.8 power factor lagging while driving a load. When an overexcited synchronous motor taking 150 kW is connected in parallel with the induction mo

Define Smoothing the Output? The output of a DAC is stepped, such as the analog waveforms which were sampled and held. This stepped, or staircase effect is a distortion, and it

Alow-noise transducer is connected to an instrumentation system by a cable that generates thermal noise at room temperature. The information-bearing signal has a bandwidth of 6 kHz

Q. A charge q(t) = 50 + 1.0t C flows into an electric component. Find the current flow.

Q. A certain 10-hp, 230-V motor has a rotational loss of 600 W, a stator copper loss of 350 W, a rotor copper loss of 350 W, and a stray load loss of 50 W. It is not known whether

Q. Explain working of Digital Process Control? Figure shows a block diagram for microcomputer-based control of a physical process, such as a chemical plant. A slight variation

the p.u. reactance of a 25 MVA, 13.2 kV alternator 0.5 p.u. On a base of 50 MVA and 13.8 KV the p.u. value shall be

what is the difference between statically and dynamically induced emf?

Risers: Riser Design : A riser or a feeder head is a passage of sand made in the cope to permit the molten metal to rise above the highest point in the casting after the mou