Minimum current for choke operation

[bluerooster]

OK, but have in mind that when accidentally the net final value coincide, mathematically IS NOT the same. Conceptually, to considerate that E/I = L, is a severe misunderstanding of Physics.

E/I does not equal L. E/Ima=L. Do not convert Ima to a.

2000v/1000ma= 2h, 2000v/1a=2000ohms

 

[DF96]

I think you may have misunderstood Osvaldo's point. He is saying that you cannot equate a resistance to an inductance, even if they are numerically (approximately) equal.

 

[Osvaldo de Banfield]

2000v/1000ma= 2h, 2000v/1a=2000ohms

That's wrong. As inductance is not equal to resistance, the reactive value of the impedance of an inductor is equal to a certain value of resistance only at one frequency. But in such a case, phase angle is 90° between them.

Please, take a reading at electricity basics, for your convenience.

 

[bluerooster]

The attached is a photograph of the text which gives the formula. It is from ARRL handbook 1972 printing. It is also copied verbatim in the 1980 version. One would think that if it were wrong, it would have been corrected some time in the 8 years between the two printings. No?

 

[DF96]

You should not regard ARRL (or RSGB) publications as being totally reliable in technical matters. They simplify things, sometimes too far. Whether they do this to aid their readers, or because the writers do not always fully understand, is not clear to me. Most radio amateurs are allergic to maths and physics. (Dave G8HQP)

 

[Osvaldo de Banfield]

The formula presented there gives a value of inductance needed but not says that this quotient is a inductance per se.

1Kg of apples is equal to 1Kg of iron. Try to eat 1kg of iron or build car with 1Kg of apples.

 

[DF96]

1kg of apples and 1kg of iron both have a mass of 1kg, so units are not violated. Equating resistance to inductance violates units, because there is a difference of units of time even if the numerical coefficient happens to be equal to 1.

 

[Osvaldo de Banfield]

That's true, but it appears that to convince this guy about his misunderstanding of math, units and (still worse) the concept behind them, I tried to give a more obvious example. Perhaps this isn't the best, but is what I imagined.