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A coil is placed in series with a resistance of 30 ohms. When the combination is connected to a 220 V, 60 Hz source, the current is 4.2 A and the power drawn by the circuit is 670 W. Determine the circuit power factor and draw the impedence phasor and power diagrams.Also calculate the coil impedance, coil inductance and voltage acroos the coil.
What is the sample period Ts?
Efficiency of MOSFET circuit provide in datasheets of any product is measured at transient state of my output node or staedy state?
A sinusoidal current is zero at t = -0.625 s and increasing at a rate of 8000pi A/s. The maximum amplitude of the current is 5 A. a. What is the frequency of i in radians per second b. What is the expression for i
Is there any advantage of star connection over delta w.r.t. induction motors? Also, is there any advantage or disadvantage of star connection over delta w.r.t. distribution and transmission of power? Please explain the reasons for all the advantag..
In a simple model of the hydrogen atom an electron has a circular orbit of radius 5.0 x 10-11 m around a stationary proton.(a) the magnitude of the electrical force exerted by the proton on the electron, (b) the speed of the electron in its motion ar..
Assuming a 24 dB link margin is needed to account for fading and loss due to heavy rainfall on the longest link, while 12 dB link margin is sufficient for the shorter link, what transmitter powers are needed at each of the four transmitters
Consider a three-phase distribution feeder with line reactance of10 ohm supplying a three-phase Y-connected load of 200 kVA at power factor of 0.85 lagging.
The following functions describe the oscillations in electric circuits and the vibrations of machines and structures. Plot these functions on the same plot. Because they are similar decide how best to plot and label them to avoid confusion.
An insurance company has made you the following retirement offer. If you pay them $100,000 now, you will receive payments of $8000 a year for 10 years. After this they will pay you $9000 a year in perpetuity (for ever).
A synchronous motor is rated as 250 hp, 4.8 kV connected 60 Hz 12 poles with Xs=0.6 pu and Rs=0.01 pu. The motor rotational losses are 1.5 kW and the excitation power is 6 kW. The motor is supplied by rated voltage at the stator.
When the starter motor, which draws 90A, is running the terminal voltage drops to 11V. What is the internal resistance of the battery What percentage of the chemical power is delivered to the starter motor
B.) Write an equation for v(t) for t > 0 C.) Write an equation for the power absorbed by resistor for t >= 0 D.) Find how much energy the resistor disspates for t >= 0 E.) How much energy is stored in capacitor at t=0
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