You’ve recently purchased a new device and you notice on the box
that it says “low voltage.” We often hear of a number of people
who are confused as to what this actually means: some suggest it uses
less electricity and saves you money, while others say that means it’s
safer to use. Those in the latter group are closer to correct; here is
what “low voltage” really means.
Low voltage is a designation that indicates that something uses a lower stream of
power than a traditional wall socket provides. Usually this means they
come with some sort of a transformer or step-down device that reduces
the voltage to a much lower level, which in turn means it’s much
safer to use.
Ultra-low voltage is even safer still, usually running at no more than roughly five volts
or so, posing little risk of arcing and almost no risk of serious injury.
This way if anything were to happen to cause a short in the device which
deals an electrical shock, you’re not at risk for anything more
than a small twinge of pain and maybe a singed hair or two.
Defining Low Voltage
The United States doesn’t actually have a threshold for “low
voltage” per se, but it’s generally accepted that the maximum
voltage for this level is considered to be around 50 volts. Conversely,
anything greater than 600 volts is considered to be “high voltage.”
In the U.S., the standard wall socket runs at 120 volts, while the larger,
round wall sockets that are usually found in your laundry closet to power
your washer and electric dryer run 220 volts. However, both of these devices
also carry a heavy risk for electrocution, serious injury, and possibly
even death if exposed to the full current. “High voltage”
areas have an even greater risk; imagine a major power substation, which
can often carry voltage levels in the hundreds of thousands.
Why Use Low Voltage
If lower voltage is so much safer than high voltage, why run high voltage
at all? The answer is sending low voltages over long distances is impossible.
Every type of electric line loses voltage as you send the power over distance
along a cable due to a factor known as “resistance.” The longer
the distance, the more voltage you lose. AC voltage is less prone to this
loss compared to DC voltage, which is why it’s used in most homes.
Therefore, sending electricity along lines over hundreds of miles requires
hundreds of thousands of volts, whereas voltage from your wall socket
to your new television can comfortably sit at 120, and even then your
TV will likely transform the current down to a lower level in order to
run off an even, consistent power current.
If you’re experiencing an electrical problem in your home,
call Lightning Bug Electric today at (404) 471-3847 to schedule your service!