AC vs DC Generated Magnetic Field

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Discussion Overview

The discussion centers on the relationship between the magnetic field strength generated by alternating current (AC) and direct current (DC) when applied to a coil. Participants explore how to equate the effects of AC and DC currents in terms of magnetic field strength at a defined point in space, seeking a formula or understanding of the underlying principles.

Discussion Character

  • Exploratory
  • Technical explanation
  • Debate/contested

Main Points Raised

  • One participant inquires about a formula to relate the magnetic field strength produced by AC and DC currents in a coil.
  • Another participant asserts that current is current, suggesting that the peak strength of the magnetic field is the same for both AC and DC.
  • A question is raised about whether applying 10 DC amps is equivalent to applying a 10 Amp RMS sinusoidal signal, indicating a need for clarification on the comparison.
  • A further response emphasizes that the comparison between AC and DC cannot be generalized without considering specific applications, noting that while DC provides a constant current, AC alternates between positive and negative values, affecting the magnetic field accordingly.

Areas of Agreement / Disagreement

Participants express differing views on the comparison between AC and DC currents in generating magnetic fields. Some suggest equivalence in peak strength, while others highlight the differences in behavior and application, indicating that the discussion remains unresolved.

Contextual Notes

There are limitations in the discussion regarding the assumptions made about the conditions under which the magnetic fields are compared, as well as the specific applications that may influence the relationship between AC and DC currents.

cesaredu13
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Good day to all, ia was trying to find info about thid topic in internet and i didn't find nothing , hope somebody can help me.

How can i find the relation between the strength of a magnetic field when i apply AC current and DC current to a coil.

in other words, how much AC current do i have to apply to a coil to have the same field strength that when i apply an x amount of DC current, in any defined point of space.

Does anybody knows a formula for this.

thanks in advanced for your help
 
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It's the same. Current is current, AC or DC. The difference is in whether the field pulses once, or rotates. The peak strength is the same.
 
So is the same thing to apply 10 DC amps that 10 Amp rms sinosoidal signal ?
 
cesaredu13 said:
So is the same thing to apply 10 DC amps that 10 Amp rms sinosoidal signal ?

You can't really compare the two unless for a specific task, i.e., lifting a 100 lb weight. The 10 A dc will be constant. The 10 A ac will alternate from -14.14 A to + 14.14 A and the field will follow.
 

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