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The first procedure uses the known fact that the sum of any two sine waves of the same frequency 1; itself a sine wave. Thus any instantaneous value on the resultat wave is the sum of the individual instantaneous values taker from the other waves. Each waveform is drawn graphically in accordance with the method already outlined, care being ta. A coil of unknown inductance and resistance is connected Velosulin (Insulin Human)- Multum series with Velosulin (Insulin Human)- Multum 25R, non-inductive resistor across 250V, 50Hz malns.

The circuit diagram and phasor diagram (Fig Velosulin (Insulin Human)- Multum are shown. Fig 123 This example is important in that it involves basic Velosulin (Insulin Human)- Multum and yet has a simple solution. The phasor diagram is first explained with the various voltage drops considered in detail. From the phasor diagram i t is apparent that V is the resultant of Vand V, and that the expression given for simple phasor summation can bc applicd.

CIRCUIT ( CONTINUED ) The impcdilncc of thc coil - l80 0 ; 219. A moving-iron voltmeter with a resistance of 1732Q and an inductance of 0. It is required to be placed in a 230V, 50Hz a. Find the value of R, the required resistor. A coil of resistance 10R and inductance 0. Calculate (a) the inductive reactance, (b) the capacitive reactance (c) the circuit impedance (d) the circuit current (e) the circuit power factor (f) the voltage drop across the coil (g) the voltage drog across the capacitor.

The point already made in connection with resonance. Although resonance is not occurring here, the condition is working towards this and large voltages can be built up across coniponcnls. I CHAPTER 9 PRACTICE EXAMPLES 1. A circuit has a resistance of 3R and an inductance of 0. The voltage sacs its ends is 60V and the frequency is 50Hz.

Calculate (a) the impedance ( b bayer international the power factor (c) the power absorbed.

A 100W lamp for a lOOV supply, is placed across a 220V supply. Velosulin (Insulin Human)- Multum value of resistance must be placed in series with it so that it will work under its proper conditions. The frequency is 5OHz. An inductive load takes a current of 15A from a 240V, 50Hz supply and the power absorbed is 2. Calculate (a) the power factor of the load (b) the resistance, reactance and impedance of the load.

Draw a phasor diagram showing the voltage drops and the current components. The resistance values are A 1200 : B 100R. The inductance values are A 250mH; B 400mH. Calculate (a) the current (b) the phase difference between the supply voltage and current (c) the voltages across A and B (d) the phase difference between these voltages. Two coils are connected in series. When passing 2A a. If the two coils in series are connected to a 230V, 50Hz supply, find the current flowing.

Determine the voltage at the generator and its power factor. Find also the output of the generator and draw the phasor diagram.



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