What does it mean variable Direct Current ?

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SUMMARY

The term "variable Direct Current" (DC) refers to a DC voltage source that can change its output voltage over time, as opposed to a constant DC source. In this context, measurements of voltage (V1, V2) and current (I) are taken at different DC voltage levels to observe how the output varies. This variability can lead to behaviors that may resemble alternating current (AC) under certain conditions, particularly when visualized as a waveform.

PREREQUISITES
  • Understanding of basic electrical concepts, including voltage and current.
  • Familiarity with DC voltage sources and their characteristics.
  • Knowledge of how to measure electrical parameters using tools like multimeters.
  • Basic understanding of waveform analysis and its implications in electrical engineering.
NEXT STEPS
  • Research the differences between variable DC and constant DC sources.
  • Explore waveform analysis techniques for visualizing DC voltage variations.
  • Learn about the applications of variable DC in electronic circuits.
  • Investigate how variable DC can mimic AC characteristics in specific scenarios.
USEFUL FOR

Electrical engineers, students in electronics, and anyone interested in understanding the behavior of variable DC in practical applications.

vkash
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what does it mean "variable Direct Current"?

I am confused on the point where i see the word variable DC in a question(see attachment). If a DC vary like a curve then in some cases it can be like AC.
How is it varying
(Don't tell me answers.)
 

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    Screenshot at 2012-02-27 01:08:57.png
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vkash said:
I am confused on the point where i see the word variable DC in a question(see attachment). If a DC vary like a curve then in some cases it can be like AC.
How is it varying
(Don't tell me answers.)
attachment.php?attachmentid=44417&d=1330285199.png

The DC voltage source is not varying , it's variable .

You apply a DC voltage at some value, and measure V1, V2 and I.

Then, change the DC voltage to a different value, and measure V1, V2 and I.

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