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
A single-phase source delivers 100 kW to a load operating at 0.8 lagging power factor. In order to improve the system's efficiency, power factor improvement (correction) is achieve

Q. Advantages and Disadvantages of rc coupled amplifier? Advantages 1. Aids excellent frequency response.The gain is constant over the audio frequency range 2. It has l

what is the graph of inverting comparator,if input voltage less than reference voltage

what is the working of thermal transducers?

The aim of this project is to design, construct and build a motorised base driven by two small dc motors. The motor drives are two H-bridges. The switching devices in these bridges

Q. Write a note on clampers ? Clamper is a circuit that "clamps" a signal to a different dc level. The different types of clampers are positive negative and biased clampers.

find E*(s) for E(s)=1-e/s(s+1)

what is the time of short circuit ?

1. Name the three parts of a programmable logic controller (PLC) and explain why the PLC is preferred by designers over electromechanical relays. 2. Medium-voltage circuit break

Complete the timing diagram of Figure of an SR latch.