On Monday, May 30, 2016 at 2:18:37 PM UTC-4, FromTheRafters wrote:


Think of it this way:

Distance equals rate times time (D=RT) and you have two trains on a
railroad track. Detroit to Chicago on one end and Chicago to Detroit on
the other. Neither train is moving. Does the distance between them drop
to zero?

No, it doesn't.


The distance in your formula is not the distance between the cities,
which of course is constant and never changes. The distance in
your formula is the distance THE TRAIN TRAVELS.




Voltage drop has no meaning in an 'open circuit', which isn't actually
a circuit at all, just as 'rate' has no meaning for objects which
aren't moving.


From Wikipedia:

"An electronic circuit is composed of individual electronic components,
such as resistors, transistors, capacitors, inductors and diodes,
connected by conductive wires or traces through which electric current
can flow."

If current can't flow, it stands to reason that it is not a circuit,
and 'voltage drop' has no meaning.

It does have meaning, it's ZERO. Zero in physics has meaning. It can
be measured. The voltage on the ends of that 100 ft of wire is exactly
the same.,

No argument on that point.

because the voltage drop across the wire with no current
flowing is zero.

There is no such thing as a 'voltage drop' when there is no current
flowing.


Which is exactly the same thing as saying the voltage drop is zero.
It's like saying if we have 3 apples and take 3 away, how many are
there now? The answer of course is ZERO, but what you're arguing
is that ZERO has no meaning. It does with apples and it does with
regard to Ohm's Law and a voltage drop of zero with no current.



https://www.youtube.com/watch?v=ggKnH-95ty0

It's like saying a velocity of zero has no meaning.

D=RT, so when the rate (velocity) is zero then D=zero*T and since
zero*T equals zero then D equals zero, so you are saying that the
distance is zero. This is obviously not the case.


Say what now? Distance Traveled= Rate x Time. If the rate is zero,
then the distance traveled is zero. Again, clearly zero has meaning.


Consider this:

What is the amperage (A) when you put zero ohms (R) resistance across
an ideal 12 volt (V) source?

Answer:

Undefined! Because A=V/R and you can't divide by zero.


Poor attempt at diversion.
But we're not dividing by zero in the case of Ohm's Law, nor in
your example of motion above. And from a math, physics and engineering perspective what happens in your new example is that as the resistance approaches zero, the current approaches infinity. We deal with infinity
and things approaching limits in engineering and math. It's not a
mystery. But none of this has anything to do with what we are doing
with Ohm's Law, because the voltage drop does not involve dividing by
zero.


This is simple math, why are you struggling with it?


Look, now you're going to start taking cheap shots? Tthe only one
here who was obviously struggling is Diesel. He
doesn't understand Ohm's Law. But now we can add you to the list because
you can't understand that in the simple case of distance = rate * time,
a zero rate gives an answer of ZERO distance traveled and that answer
of zero definitely has meaning, just like zero voltage drop from Ohm's Law
has meaning.

Gfre, WTF has happened to education in America? We now have two idiots here
trying to explain basic math and electricity to us and neither knows
WTF they are talking about.