MH's ideal coil and voltage question

[tinman]

Brad:

<<< If it is infinity,then there is going to be no current flow into the ideal inductor-correct?  >>>

Here is something for you to ponder:  A straight line is a circle with a radius of infinity.

A straight line is not a circle,as it has a beginig and end-unless it is infinitely long. A circle is an infinite loop.


Brad

[poynt99]

OK,so here is the part in that reply i dont understand.
If the inductor looks like a perpetual open (circuit i guess?)to the voltage source,then what is the load?

Brad

Zero current means no load. So we have an infinite load, i.e. an "open" circuit.

[tinman]

I'm not being sarcastic at all.

Unless I'm overlooking something, or don't correctly understand the question, there will be no current, and the voltage across the inductor will be whatever the voltage source is at any one time, from t=0 to the end of time.

Given that tau=infinity, there can be no change in either I or V. Indeed if R is non-zero, there will be a current and the voltage change over time.

Thanks Poynt
I did not believe that you would answer questions this important in a sarcastic manner -as i pointed out to MH.

So this would mean that MHs original question would result in the applied voltage being seen across the ideal inductor,and nothing more than that.

So rather that slam all my theories in one post,maybe a step at a time would be better.

So,if there is no current flowing through the inductor,that would mean no inductance/no resulting rising magnetic field?--correct?


Brad

[MileHigh]

<<< You have already stated that there is no time constant,and the value could be infinity or undefined-correct?,or do i have that wrong?. >>>

Here is the reason I am saying there is no time constant:  It's because in the ideal coil case you will never have a situation that meets the standard definition of a time constant.  So in that sense there is no time constant.

Take the example of a car that is front wheel drive.  A car with front-wheel drive will not handle the same way as a car with rear-wheel drive.  So there is no point in talking about handling problems with rear-wheel drive cars to someone driving a front-wheel drive car.

And yes, the time constant is infinity.  It's another way of saying the same thing.  The real question is what does that mean for this test?

[MileHigh]

Poynt, I hope you did not miss my reply #108.