Technically you don't have a "power source" in an electrical circuit.
You either have a voltage source or a current source or a combination of
Power doesn't flow in a circuit--only current does. Power is dissipated
by the various components in a circuit. The instantaneous power
dissipated by any particular component can be given by I^2*R, where I is
the instantaneous current flowing through the component and R is the
resistance of the component. (This is all assuming a purely resistive
The electrical utility applies an alternating voltage to the conductors
attached to the house. This causes an alternating current to flow in
those conductors, with the amount of current depending on the resistance
of the various circuits in the house.
Thus, whether you say the hot wire "goes to", or is "connected to", or
"comes from" the breaker, it is all equivalent.
I am slow. There is no power source in an electrical circuit? Why do
they call it the power company? Ours is called Georgia Power.
Isn't a combination of voltage and current "power" by definition?
Now I understand things better. The power company sends clean electrons thru
the hot wire, they are used and get dirty in the house, and they go back to
the power company thru the neutral to be cleaned up and sent back out again
on the hot wire. I always wondered what that neutral wire was good for! 8>)
And why have 2 hot wires, when those electrons could fit in one?
I checked that out. The other hot is just a signal wire for the
[censored] evil mind reading and writing interfaces. The ones that
make sure you vote for the "right" candidate.
You didn't actually read that, for it has never been written.
The electrons are going back and forth (AC) and never get anywhere.
What's being sent is the kinetic energy carried by electrons.
Interestingly, power companies claim that electricity moves at the
speed of light. This is impossible for electrons (nonzero mass).
1. Wires are twisted to cancel out differential mode noise. Not all
multiconductor phone cables are twisted pair. Always buy the ones that
are labelled for multi-line, they are twisted. It really sucks to run
a bunch of cable all around carrying 2 lines in it and find out you
can hear the person on the other phone. Happened to me years ago.
2. Ground fault breakers have neutral connected to them and then
neutral for circuit connects to the breaker along with the black wire
on the hot terminal. Reason is that the ground fault breaker needs to
monitor the hot to neutral voltage of the circuit and the most
accurate way to do that is by monitoring the individual neutral wire
for the circuit.
3. Power = Volts x amps (already stated). Other forms of the equation
for inductive or capacitive loads and 3 phase.
4. Yes, all electrical wires have some amount, however small, of
inductive and capacitive component. For electrical power, the
inductance is only an issue with frequencies greater then 60 hz. I
remember the days of wiring 400hz motor generators for computer
systems. The wires had to be derated for the 400 hz and you had to run
them in aluminum conduit because the inductive reactance of the 400 hz
in a steel conduit would cause the conductors to heat up. Steel is a
good shielding material and it keeps the fields within the conduit
much better then aluminum, therefore the fields heating up the wire.
So, a great thread in some ways. Wow, all this theory and we still
haven't figured out what the author's issue is.
No, it's because the GFI breaker wants to monitor the *current* in the
white and black wires. It passes both of them through a small current
transformer. If the output of the current transformer is nearly zero,
then all the current flowing in the black wire is balanced by the
current flowing (in the other direction) in the white wire, none of it
is leaking somewhere else, and all is well. But if there's output from
the current transformer, the black and white wire currents aren't equal,
some of the current is thus finding another path to neutral or ground
(or another hot wire, for that matter) and the GFI trips.
It can't work at all without monitoring white wire current, so the white
wire has to pass through the breaker.
This is quite improper statement. From basic Ohm's law, current/voltage
produces power measured in Watts usually which can be converted into
Joule, Calorie, Horse Power, etc. Current flows, power does not.
There is phantom power(false power, wasted power) in inductive cicuit.
Many loads are not pure resistive. There is always inductive/capacitive
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