Last time I looked into this, the volt was made at a manufacturing
plant and somwhere along the line the batteries were put in, which
generates the coulombs, that moves the wheels..
I can't tell you the average speed at 1Volt, 1 Amp per second, thats a
little over me head.
Jamie
Above my pay rate.
is implemented using the Josephson effect for exact frequency-to-voltage
conversion, combined with the caesium frequency standard.
For the Josephson constant, KJ = 2e/h (where e is the elementary charge
and h is the Planck constant), the "conventional" value KJ-90 is used:
excited by microwave signals between 10 and 80 GHz (depending on the
array design).[3] Empirically, several experiments have
shown that the method is independent of device design, material,
measurement setup, etc., and no correction terms are required in a
practical implementation.[4]
Mikek
P.S.
Here is a calibration unit, if your interested.
See links across top of page.
Reams and reams and reams of information available from a simple Google
search, and you have to ask here?
Start "National standards bodies" and go from there.
Specifically, a volt is defined as the EMF that releases one joule of
energy if one coulomb of charge is allowed to move through it.
A coulomb is the amount of charge transferred when a current of one ampere
flows for one second.
The ampere's official definition is complicated, it is the amount of
current that when flowing through infinitely long parallel wires 1 meter
apart produces a certain force between them.
Yes, and the USA have the lowest electrical safety standards
of the world, equal to Pakistan and back street Bangla Desh.
No RCDs in the American homes.
You have to wait until the 600A main fuse blows.
How many get killed every year in USA by electricity?
w.
We call them GFDs. My house has them in all outlets near plumbing
fixtures or other likely-grounded locations.
Fuse? We use circuit breakers. My house is wired 120-0-120 volts, with
a dual 125 amp main breaker. Most outlets are 120, and a few, for big
loads, are 240. We don't have a/c, which is the big load in most of
the US. Our heat and clothes dryer and cooking are gas.
Getting hit by 120 volts is not nearly so dramatic as contacting 240.
I do most wiring hot.
A little browsing suggests that there are about 51K electrical fires
in the USA per year, with about 500 deaths.
The corresponding numbers in GB look like 37K and 250.
The population ratio is about 5:1.
It's mostly older buildings that have electrical fires. There is some
horrendous ancient knob-and-tubing stuff in the attics of old
Victorians around here.
You are sadly misinformed. The Current and for the last several 3 year
NEC cycles requires Arc Fault protection on most circuits in the home
with the same 30MA ground fault protection you get from an RCD. In
addition in high risk areas, Kitchens, bathrooms, utility buildings,
outdoors and near sinks, we require 5ma ground fault protection that
is 6 times as sensitive as your RCD.
About 100 in home accidents and with 350 million people, it barely
bumps the needle. Ladders kill far more.
very intersting!there are some homes here, too, with marble (!)
distribution panels, that means a sheet of marble, with everything on it
(splices, knob type, switches, fuses,and so on). The owners of the homes
are stubborn against modernizing them, as it's a great expense.
Knob-and-tube is perfectly good as long as nobody futzes with it.
Problem is, old houses tend to collect "informal" electrical and
plumbing work.
Cheers
Phil Hobbs
fascinating!of course you have different methods as most houses in USA
are built of timber. Here the old system was iron tubes (iron not
steel!) on the wall and small boxes, both junction and for plugs etc.
also of iron. sometimes I come upon paper insulated cables! there are
still many underground cables with paper insulation (both medium and low
voltage).
we also don't have A/C although in Greece we have separate units in each
room.We have a wood stove and 2 pellet stoves. The pellet stoves are
fully computerized and automatic. In our holiday home in Vori we have a
wood stove, a cassette fireplace and 3 A/C units. In my mother's holiday
house central heating with an oil furnace and another yet cassette
fireplace.Here most houses are single phase with a 35 A main fuse and 3
* 10 mm^2 feed (#10). Sometimes 3 phase 3 * 35 A. My sister's which is
very big has 3*50 A main fuses and all floors are wired 3 phase.GFCI
breaker on each floor.New code means that every residence *and*
corporate must have a 30mA GFCI breaker.
new EU regulation makes electrical installation testing mandatory in
each residence *and* corporate (no matter how small or big). The
qualified tester must have an installation tester that tests the *real*
tripping current of the GFCI and contact voltage.Insulation resistance
of each feed that leaves the dist.panel. Continuity of earth
conductors.Ampacity of each feed loop (that means that if there's a
short circuit the breaker will trip in a very short time, I think
several ms). Earth resistance. And the electrician has to fill (and
sign!) a special sheet that has all these measurements and the utility
takes it in.
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