AC Voltage at Point X on Wire: Positive and Negative Half Cycle

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SUMMARY

The discussion focuses on the behavior of AC voltage at a specific point X on a wire during both the positive and negative half-cycles of a sinusoidal AC waveform. It is established that the potential at point X mirrors the source voltage, albeit with a slight time delay due to the finite speed of voltage transmission. The discussion also highlights the calculation of RMS voltage, emphasizing that for a 220V RMS sine wave, the peak voltage is 311V, leading to a peak-to-peak voltage of 622V. Additionally, it is noted that while sine waves are common, AC can also take other forms, such as sawtooth waves.

PREREQUISITES
  • Understanding of AC voltage and current concepts
  • Familiarity with RMS voltage calculations
  • Knowledge of sinusoidal waveforms
  • Basic electrical circuit theory
NEXT STEPS
  • Study AC voltage waveform characteristics and their implications
  • Learn about RMS voltage calculations for different waveforms
  • Explore the effects of wire length on voltage transmission
  • Investigate various types of AC waveforms beyond sine waves
USEFUL FOR

Electrical engineers, students studying circuit theory, and professionals working with AC power systems will benefit from this discussion.

amaresh92
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greetings,

consider a wire which is subjected to AC supply.now consider a point X anywhere on wire.
now what will be the potential of that point during the positive and negative halfcycle of sinusoidal AC?what will be the direction of current?
thanks
 
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not only you need X, you also need time. then you need the graph of the ac source
 
amaresh92 said:
greetings,

consider a wire which is subjected to AC supply.now consider a point X anywhere on wire.
now what will be the potential of that point during the positive and negative halfcycle of sinusoidal AC?what will be the direction of current?
thanks

What do you think? Why don't you draw a sketch of an AC voltage source driving a resistor divider. Sketch the AC waveforms -- what do they show?
 
An easy way to answer your question is to consider that at the point some distance from the source, the voltage (potential) will be exactly like the source voltage, just delayed a tiny bit in time to account for the finite speed of the voltage transmission...assuming the wire is a few inches or feet not tens of thousands of miles...so you have answered your own question in your post...
 
berkeman said:
What do you think? Why don't you draw a sketch of an AC voltage source driving a resistor divider. Sketch the AC waveforms -- what do they show?


what kind of thing the voltage?
 
Last edited by a moderator:
You can check the rms values of AC voltages. Suppose if you have 220Vrms than it means your AC waveform is a sine wave having positive peak of 311 volts and negative peak of 311 volts. This means peak to peak voltages are 311+311=622 volts.
Peak Voltage = RMS Voltage x square root of 2
Thanks
 
ssana said:
Peak Voltage = RMS Voltage x square root of 2
Thanks

Only on a sine wave.
 
Usually sine wave is generated from the generator coil. The alternate wave is not necessary a sine wave. It can be sawtooth wave or any alternate cycles. The above mentioned formula to calculate rms voltage is for the sine wave.
 

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