On Thursday, December 29, 2016 at 3:36:48 PM UTC-5, Confused wrote:
On 12/29/2016 1:07 PM, trader_4 wrote:
This just keeps going farther and farther into the wilderness.
The real problem here is that Rafters does not understand Ohm's Law
and Kirchhoff's Laws. He denies there is voltage drop across a
capacitor that's in a circuit.


Maybe were all just talking semantics here but I'm confused.

With respect to DC, is a capacitor like a rechargeable battery?


Yes, they have some similarities.



Is 'voltage' the same as 'voltage drop'?

Voltage drop is the voltage across a component or from one
point in a circuit to another.



Is there 'voltage drop' across a battery?


There better be or Kirchoff's Law would not work. Let's say
a 12V battery drives two identical light bulbs. Now let's
take a meter and follow the circuit starting with the positive
terminal of the battery. Place the positive meter lead on it,
the neg meter lead on the other side of the first bulb. You
get +6V. That is the voltage drop across the first bulb.
Now keep going. Take the positive meter lead and put it between
the two bulbs and put the neg lead on far side of the second bulb.
Again you get +6V, the voltage drop across the second bulb.
Now complete the loop by taking the positive
lead and place it on the far side of the last bulb and the neg
meter lead back where you started, at the beginning of the loop,
which is the battery positive terminal. You get a reading of -12V .
Add up the voltage drops around the loop:

6 + 6 -12 = 0

Kirchhoffs Law

The drop across the battery is negative, meaning it's an increase,
not a drop.




Is there 'voltage drop' across a rechargeable battery?


Yes, if it's in a circuit.


Is there 'voltage drop' across a capacitor?

Yes, if it;s in a circuit.

Voltage is a difference in potential.
Voltage drop is a difference in potential across a particular component,
element, device in a circuit.


From Rafter's own source, wiki:

https://en.wikipedia.org/wiki/Kirchhoff's_circuit_laws

The directed sum of the electrical potential differences (voltage) around any closed network is zero, or:
More simply, the sum of the emfs in any closed loop is equivalent to the sum of the potential drops in that loop.

And note that it holds true whether they are resistors, caps, inductors
or even active components.


Rafter's specialty is perverting the straightforward and obvious.
Ask for his tutorial on how you can't say a 10A current is flowing
in a wire, because current doesn't flow.