"Pooh Bear" <(E-Mail Removed)> wrote in message

news:(E-Mail Removed)...

>

> Skybuck Flying wrote:

>

> > Nice introduction to signals across a wire.

> >

> >
http://penguin.dcs.bbk.ac.uk/academi...nous/index.php

> >

> > I never understood the difference between voltage and ampere... to bad
this

> > page doesn't discuss how ampere is related to voltage. (voltage<->ampere

> > very confusing )

>

> That's pretty fundamental. The classic example is to compare electricity
to water.

>

> Voltage is like water pressure - current is like water flow. With no
pressure no water

> flows. The larger the pipe ( less resistance to flow ) the more water
flows. In a similar

> way, the less electrical resistance, the more Amps flow in a circuit for a
given voltage.

Does this mean a pipe diameter (of a certain material) always allows a

certain maximum voltage ?

So if the source of the voltage becomes to high the pipe blows ?

Probably yes, ok that's easy.

Now what about two different pipes:

Pipe A has a large diameter with a maximum of 100 volts to flow through it.

Pipe B has a small diameter with a maximum of 15 volts to flow through it.

Source A has a pressure of 14 volts and is connected to pipe A.

Source B has a pressure of 14 volts and is connected to pipe B.

I have two meters.

I stick a voltmeter A in pipe A.... what would it measure ?

I stick a voltmeter B in pipe B... what would it measure ?

Both would probably measure 14 volts.

The difference would be the ampere.

The flow through pipe B would have to be faster, since it's smaller.

The flow through pipe A could be slower, since it's wider.

According to your explanation:

Sticking an ampere meter in pipe A should show a lower ampere.

Sticking an ampere meter in pipe B should show a higher ampere.

If this is how it works I think I understand it a little bit

However microelectronics are very very very small.

So for me it's hard to see the diameter and the resistance... (resistance is

related to the material

)

Ok I think I am starting to get it.

Let's see even a more complex example:

Pipe A is split up into

Pipe A1 with a diameter of allowing 5 volts

Pipe A2 with a diameter of allowing 95 volts.

Now a good question is the following:

The voltage at pipe A1 would be 5 volts ? or would it blow up ?

It could be possible that the remaing 9 volts would simply go into pipe

A2...

It probably depends on the strength of pipe A1...

At this point I really wouldn't know what the answer is

Maybe it's related to the resistance or something... if it could resists 15

volts it might survive...

But I don't think this is what resistance means ? or maybe it does ?

I thought resistance means how much voltage is lost....

Maybe this is the correct answer after all... if Pipe A1 has a resistance of

9 volts it could allow 5 volts to flow through it...

But what would happen to the other 9 volts ?

Would it go lost in Pipe A1 or would it flow through Pipe A2 without loss ?

I dont think the voltage would be simply halfed... since that's not how

water behaves

So the point is: The concepts pressure, flow, maybe even resistance are easy

to understand... but how it behaves in reality especially in electronics is

a little bit more difficult to understand

Unless the answers are really simple... so I am curious what the answer(s)

would be

Especially the splitting up of the pipe question

Bye,

Skybuck.