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

Ask question #Minimum 100 words accespted#i want solution manual of electronic instrumentation and measurements

Dummy coils : These coils are used with wave winding and resorted to when the requirement of the winding are not met by the standard armature punching available in armature win

What''s the formula for the VB2'' in a UJT?

This question investigates the effect of extending the data set with zero-padding & of the appropriate time in the workflow to apply a window function. To get finer resolution in t

Q. For the networks shown in Figure, determine the transfer function G(s) = V o (s)/V i (s).

We can illustrate the direction and strength of a magnetic field by means of drawing 'flux lines'. These have arrows to show the direction of the magnetic field at any point and th


Q. Explain about Folded network? Folded network: When all the outlets/inlets are connected to the subscriber lines, logical connection appears as displayed in figure. In this

Q.   Derive the expression for generated emf in a dc generator. Ans. Expression for Generated emf in a DC Generator                We shall now derive an expre