Engineering Board Exam Reviewer · Alternating Current and Voltage · medium
Which expression describes the voltage waveform shown?
- v=24 (125t) V
- v=24 (785t) V
- v=24 (785t) V
- v=48 (785t) V
Answer
C. v=24 (785t) V
Solution
The peak is 24 V and the period is T=8 ms, so =2π/T=2π/0.008=785 rad/s. The wave starts at zero and rises, so it is a sine: v=24 (785t) V.
More Alternating Current and Voltage questions
- What is the average value of a sine wave over one complete cycle?
- A sinusoidal voltage has a peak value of 311 V. What is its rms value?
- A voltmeter reads 120 V on an ac line. What is the peak value of the voltage?
- Find the angular frequency of a 50 Hz source.
- What is the period of a 60 Hz ac voltage?
- What is the rms value of the sinusoidal voltage shown in the plot?
- The sinusoidal voltage shown is plotted against time in milliseconds. Find its frequency.
- Two currents i1=10 t A and i2=10 ( t+120°) A flow into a junction and add. What is the peak value of the total current?
- How long does it take a 400 Hz sine voltage, starting at zero, to reach 70.7% of its peak value for the first time?
- A sinusoidal voltage has an rms value of 120 V. At what angle in the first quadrant of the cycle does its instantaneous value equal 100 V?