12. A two-element series circuit has voltage V = 240 + j0 V and current I = 48 - j36 A. Find the current in amperes which results when the resistance is reduced to 50% of its former value.
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answer number 12.write your solution pls.
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- (b) An engineer is required to analyse a sinusoidal waveform for the voltage and current using oscilloscope. The voltage waveform produced Root Mean Square (RMS) value at 75 V with positive-going zero crossing at 30°. While the RMS value of current is 66.71 A with negative-going zero crossing at 0.349 rad. Assume the frequeney of both waveforms is 50 Hz. (i) Sketch the voltage and current waveform in the same axis by showing the important point. (ii) Determine instantaneous voltage when t = 8ms . (iii) Determine phase relationship between voltage and current waveform.Consider the characteristics of alternating current (ac). Find the false statement below. A. Alternating Current is any current that periodically changes direction. B. The graph of an ac source shows the relationship between magnitude and time. C. The frequency of an ac signal refers to the noise on the signal. D. The period of an ac signal is the reciprocal of the frequency. O A. O B O DThe ripple factor for pure dc is Answer:
- Please explain in detail. A. In a series circuit, if the AC voltage is measured across the AC voltage source, will there be any variations in the phase of the AC voltage across each resistor from the measured AC voltage across the source? B. In an AC voltage source, why does voltage vary with time? Please explain in detail. C. In a series circuit, are the frequencies of the AC voltages across each resistor the same? Why is this so? ...(b) An engineer is required to analyse a sinusoidal waveform for the voltage and current using oscilloscope. The voltage waveform produced Root Mean Square (RMS) value at 75 V with positive-going zero crossing at 30°. While the RMS value of current is 66.71 A with negative-going zero crossing at 0.349 rad. Assume the frequency of both waveforms is 50 Hz. (i) Sketch the voltage and current waveform in the same axis by showing the important point. (ii) Determine instantaneous voltage when t = 8ms - (iii) Determine phase relationship between voltage and current waveform. (c) From the measurement process, the circuit generated two different outputs, V,(t) and V,(t) with the same peak voltage. The V,(t) lagging V,(t) by 100°. If V,(t) =150sin(1000t – 40°)V , determine the RMS value and phase angle of.The rms current in a 33.0-0 resistor connected to an AC source is 2.80 A. (a) What is the rms voltage across this resistor? V (b) What is the peak voltage of the AC source? V (c) What is the average power dissipated by the resistor? W (d) What is the maximum current across this resistor? A
- Draw the waveform of voltage and current under the following conditions: A current which lags the voltage by 60°. A current which leads the voltage by 60°. A current which is in phase with the voltageAn alternating current varying sinusoidally with a frequency of 50 Hz has anrms value of 20 A.a) Determine the instantaneous value at 0.0025 seconds.b) Determine the instantaneous value, 0.0125 seconds after passingthrough a positive maximum value.c) At what time, measured from a positive maximum value, will theinstantaneous current be 14.14 A?Q18. An AC waveform is shown in figure B3. 4 10 20 30 40 50 70 100 Time (ms) 110 -2 -3 -4 -5 Figure B3 i) For the above waveform, determine a. Peak-to-peak voltage b. Time period c. Frequency ii) For the above waveform, determine a. Peak Factor b. Form Factor
- Find the RMS value of a 50% chopped ac waveAn ac voltage represents by a sinusoidal waveform as shown in Figure 6 below. a) Define: i. The period ii. The frequency b) Referring to Figure 6, given that the peak voltage Vp = 24 V. Determine: i. The period, T ii. The frequency, f. ii. The angular velocity, w. iv. The voltage, VRMS V. Write the mathematical expression for the sine wave in Figure 6 to represent the ac voltage.b) Determine the voltage ?(?) and current ?(?) sinusoidal forms. Sketch one cycle of the waveforms in the same x-axis. Clearly indicating the peak value and the period of each waveform and the phase difference (in milliseconds) between the two waveforms. c) Determine the values of resistance R and inductance L. d) Determine the phasors ?L, ?r and ?c. e) Sketch the phasor diagram showing ?s, ?r, ?r, ?c and ?.