Electronics Forum / Electrical Engineering / July 2008

My fridge was installed at a different location than originally
planned so I think the wiring was not done right. The fridge is on a
20A circuit with its outlet the first one on the circuit, then the
GFCI outlet, then other small kitchen appliances such as toaster,

I am trying to learn more about synchronizing a mini power station to
a national grid network.  Can someone recommend a good book that
explains this.  And what are the equipments used here and who
manufacturers these products?

If I wanted to use a relay to turn on a light bulb, should I get a rating
for the bulb's instantinous current; i.e. turn-on from cold or it's
quiescent current?
TIA

IPM – International Perforation Management is a relatively small high-
tech engineering company with its based in South-East Asia,
specializing in production and supply of micro perforation systems and
machines for micro material processing of web treatment or other

Our computer server room outlets for our power distribution units (PDUs) are
protected by ground fault protection.     As I understand it, a GFP will
trigger when it senses current on the ground, and when it does then the GFP
shuts off the circuit.     We tried today to rewire ...

Most 220V to 110V travel adapter use a transformer, making it very heavy.
Is there something that is transformerless? Perhaps some sort of switching
circuit?

In analogue to digital conversion ,it is often that sampling frequency
should be greater than twice the maximum frequency contained in the
original signal.How to choose a an analogue to digital conveter  if we
have no idea about the frequency content of the signal to be conveterd

My project is to control a pressure reducing valve from 3000psi to
10psi using a program call LabView. Really all I need to do is run the
proportional amplifier card which runs from 0 - 10VDC. I keep running
around in circles trying to figure out what LabView actually outputs

Overheard two guys discussing flow measurement in a pipe line. One of the
guys says "we can't install a mag flow meter in the pipeline because it (the
pipe) is stainless steel". The other guy nodded but looked bemused.
I thought to myself, why not?

In my service panel (dating from 1980) I have several ganged type
breakers for the AC, Range and Water heater. Today I had to expand the
panel by two lighting circuits, and in the process had to remove these
ganged breakers. I was surprised to find that the two breakers in each

Need 45amp (plug in type) Square D mcb.  Can only source 40 or 50amp.
Anyone know if one is available.

Is there an easy way to calculate an RC circuit if I want a specific
voltage in a given time?
As an example: I have 5-volts into an RC and I want it to reach 2 volts in
500ms.

Can anyone point me in the right direction of a UK source of a 110V,
600VA UPS
TIA,
woodglass...

As it is well known fact that in a DC system, two terminal exist
(positive and negative) and current or power flows from positive to
negative. so it can be say that one conductor carries current and
other returns the same current and there must be close loop to current