Why does OHMs law not work on AC circuits?

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SUMMARY

Ohm's Law applies to both AC and DC circuits, but the interpretation differs due to the nature of alternating current. In AC circuits, voltage measurements can yield the same readings with and without a resistor when using root mean square (RMS) values, which represent effective voltage. In contrast, DC circuits provide a consistent voltage reading across resistors. The discussion emphasizes the importance of using RMS values in AC calculations to accurately apply Ohm's Law.

PREREQUISITES
  • Understanding of AC and DC circuit principles
  • Familiarity with Ohm's Law
  • Knowledge of RMS (Root Mean Square) calculations
  • Basic electrical measurement techniques
NEXT STEPS
  • Research the differences between AC and DC circuit behavior
  • Learn about RMS voltage calculations in AC circuits
  • Explore the concept of ideal vs. non-ideal AC sources
  • Study practical applications of Ohm's Law in AC circuits
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Electrical engineers, physics students, and anyone seeking to understand the application of Ohm's Law in AC circuit analysis.

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can someone please explain to me physically how is it that
when i have an AC source and i measure Voltage on a resistor its the same with and without the resistor
and when i have a DC source and i measure Voltage again on the resistor and now there's a different reading

its like ohm law doesn't support AC circuits but why ?
 
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Did you use the peak value or the r.m.s. value of the AC source for your computation?
 
Ohm's law works fine for AC circuits. It sounds like your AC source is closer to ideal.
 

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