2007-08-30 06:14:17 · 9 answers · asked by sarasmileshine 2 in Science & Mathematics ➔ Physics
No.
High voltage direct current is used for long-distance point-to-point power transmission and for submarine cables, with voltages from a few kilovolts to approximately one megavolt.
DC is commonly found in many low-voltage applications, especially where these are powered by batteries, which can produce only DC, or solar power systems, since solar cells can produce only DC. Most automotive applications use DC, although the alternator is an AC device which uses a rectifier to produce DC. Most electronic circuits require a DC power supply. Applications using fuel cells (mixing hydrogen and oxygen together with a catalyst to produce electricity and water as byproducts) also produce only DC.
Most telephones connect to a twisted pair of wires, and internally separate the AC component of the voltage between the two wires (the audio signal) from the DC component of the voltage between the two wires (used to power the phone).
Telephone exchange communication equipment, such as DSLAM, uses standard -48V DC power supply. The negative polarity is achieved by grounding the positive terminal of power supply system and the battery bank. This is done to prevent electrolysis depositions.
An electrified third rail can be used to power both underground (subway) and overground trains.
2007-08-30 06:18:21 · answer #1 · answered by DanE 7 · 1⤊ 2⤋
Country Homes Power Supply
2016-12-18 04:26:42 · answer #2 · answered by ? 4 · 0⤊ 0⤋
Yes.
Please quit Reading Wikipedia. Please nothing in it is true.
DanE - Wikipedia is wrong. The question was not about power supplies. Just pasting irrelevant Wikipedia crap is not answering the question Please quit this copy and paste campaign to hack Top Contributer PLEASE.
If you do not know the answer, do not post
There is a DC power distribution in down town St. Louis that powers the many of the old elevators and several buildings.
This system will remain al long as the subway operates on DC.
Many foreign countries have remote communities on DC.
Several off shore islands have DC only systems.
Teledyne and other manufacturers of dynamos still provide the equipment and even contract to maintain these systems round the world.
Every city with a DC subway has at lease a few customers using DC power from their DC grid. Usually left over from years ago.
The City of Baghdad AZ is powered by the DC generators that feed the copper reclamation electrolysis.
Mining towns across the globe use DC when that is what the mine generates.
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2007-08-30 06:21:52 · answer #3 · answered by Anonymous · 5⤊ 0⤋
I'm pretty sure that no commercial power supply uses DC these days . DC has a lot of serious drawbacks compared to AC.
DC voltage drops rapidly as the transmission distance increases.
It is not easy to convert one DC voltage to another in circuits handling high currents.
DC requires much heavier (and much more expensive) conductors than AC.
2007-08-30 06:21:30 · answer #4 · answered by Anonymous · 0⤊ 0⤋
Yes, many. I have model rail road equipment made in Germany. It is DC, the transformers are in DC and I have to use a AC to DC converter. I spend a year in Germany and a year in Belgium. There are on DC as are other Euro countries. The former USSR is on 220 AC. I think England is also on AC.
2015-03-21 12:47:24 · answer #5 · answered by RWM 1 · 0⤊ 0⤋
This is what I am trying to figure out. I know Europe uses 220 voltage system and I am told is is less expensive than what USA and Canada use 110 Volt system. Do not know if that is true. Also told that 220 volt systems are safer. Again do not know if this is true. Anyone know for a fact?
2015-03-23 12:59:58 · answer #6 · answered by Gayle K 1 · 1⤊ 0⤋
Bahrain supplies direct current electricity to homes throughout the emirate.
2014-04-13 16:42:04 · answer #7 · answered by bill f 2 · 0⤊ 0⤋
I have heard it a few times on Fox news channel and Fox Business channel over the last month. No need to assume you get your news from the AP, Reuters, and Huffington Post. How about one Liberal, One mainstream, and one Conservative organization so you can make intelligent conversation? Of course, Drudge is a great source of links -- he does not comment so you can make your own decision. I read all of these sites even though I see their "take" of news...
2016-03-13 01:05:00 · answer #8 · answered by Anonymous · 0⤊ 0⤋
220V is certainly not safer. Higher voltage means higher potential which means higher level of danger. Not to mention that most European 220V systems are un-grounded which makes it even more unsafe.
2015-04-14 08:10:18 · answer #9 · answered by Charles 1 · 0⤊ 0⤋