Electronics Forum / Electrical Engineering / February 2008

I have been looking in vain now for a source that explains in a
slightly patronizing non-caffeine manner (the dummy part) the very
fundamentals of calculating electrical generators - i.e. the formulas
that let me know how many windings of what material will result in

Im an electrical engineer in europe,
But now I have to design an Electrical installation where they have a
so called "Open Delta" connection.
I believe it is the same as our 3-phase delta system, exept that one

I need to know about installation cost and technical information for
static var compensator. Can anyone tell me from where I can gt these
informations

I am remodeling the kitchen in my condo and need some advice with
regards to the electrical panel.  Currently, it is located on an
interior wall with access from the kitchen.  Seems silly to me, as it
makes it difficult to use that wall for anything.  What I would like

It turns out that for our ECG system we are over the limit for leakage
current.  We have some current limiting resistors that go in between
the electrodes and amplifiers but that doesn't seem to be doing the
trick.

Hi, I need some help, I hope I can explain the problem correctly. We
have,  ac/dc control box, with a switch for off and on. The gear motor
runs fine  this way but will only go in one direction, however if you
switch the motor leads ////////black   white the motor will reverse

When my water heater kicks "ON" some (if not all) of my electrical
outlets serge to (136-139 volts) When I throw the hot water braker to
"OFF" the outlets resume (109-111 volts) I just replaced the (hot water
heater) heating element two days ago because of problems. Things are

In the case of a commercial building served by 3 phase - closed delta
240/120 Vservice, what is the best way to detect a ground fault on a
three phase motor circuit on phase C were it to come into contact with
the ground?

Today I was asked to provide comment on an invention that uses the
existing wiring (active+neutral+ground/earth) in a house with the
following modifications...(a) an isolation transformer at the incoming
circuit-breaker box, (b) float the ground/earth wire inside the house

I've been pondering a question lately that I figure you guys can help me
with.
There are, based on my casual observation, many places in household wiring
where the connections within a circuit have a much smaller contact area than

Why are some rechargeable batteries not replaceable?  As in electric
razors, bluetooth headsets, etc.  I can see no reason for it that makes any
sense from either a technical or marketing standpoint.

I am taking a course on electric motors and i have a couple of
questions.
1) When you have a wire and you loop it through an iron bar, what
causes the iron bar to become a magnet?

Hello, all,
I'm still waiting for my electrician to come out and install a
6-circuit subpanel in my barn workshop for 240V. Since I'm having so
much trouble getting a crew out here, I'm thinking of running all the

What 2 of the basic Ohm's Law formulas (using Algabra) are used to get
R = E^2/P Also   I=Sqrt of P/R    E=Sqrt PxR   R=E^2/P
How do you determine which 2 combinations of E=IR  P=EI   I=E/
R ..........

I am having trouble understanding the output voltage graphs about the
half wave rectifier with the ideal diodes. For example, we have a
circuit where Vi = sin (pi*t), a resistor = 1 kilo ohm, and one diode
which is reverse biased. We are trying to find out how Vout graph