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220 volts Versus 120 volts

Discussion in 'Electronic Basics' started by donskister, Nov 23, 2006.

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  1. donskister

    donskister Guest

    1. Hi guys! i noticed that every countries have their different
    voltages supply..in my country we used 220volts other countries used
    120volts... im just confused can u pls enlighten me...what is more
    economical to used 120v or 220v? advantages & disadvantages using 120V
    or 220V? We all know a TV that was manufactured at Japan having 120v
    can used to other country that have 220V using step up transformer...

    2. I saw lately my friend have a halogen bulb w/ the specifications of
    24Volts ac 5Owatts, the problem is he told me that the store he used to
    buy that bulb are out stock only available are 22.8Volts ac 50
    watts...This will be used at the OR lights ( heraeusHanaulux ) ...im
    just confused! that the reason i come out w/ my question no. 1..What is
    the reason of having different voltages used to light up a bulb having
    a 50 watts:Is there any effect in intensity of the lights and operation
    of the equipments? confuse: .....By the way in our countries we used
    220volts ac.

    3. 220volts versus 120volts .........
     
  2. Google for Electricity Around the World.
     
  3. HKJ

    HKJ Guest

    The advance of 230VAC is that your need less copper for wires.

    I do not belive safety is an issue anymore, all equipment designed for
    230VAC has enough safety.
     
  4. Alison

    Alison Guest

    Mains electric shocks always give me the giggles. They bloody hurt though.
    Cor!! that'll make you jump!
     
  5. High voltage has advantages. Its a more friendly world to work with.
    Wires and circuits can be made lighter, smaller, and are easier to
    manage.

    I work with 480 volts. The wires going to a large load such as dozens
    of lights or a motor are MUCH smaller using high voltage than low
    voltage. The lower currents of the high voltage are less likely to
    cause melting of poor connections.

    Unfortunately, high voltage from 480 volts can flash over dirty
    connections in high humidity. And a finger touching the wires can
    cause interesting damage to the body, like blowing off fingertips.
     
  6. In most of the world a single voltage system is used, such as 230/400 VAC
    (single/three phase). No split systems, no multi voltages. N. America is
    unique in their system of multiple voltages in the same building.

    For extremely large motors, sometimes 11 kV, 3 phase is used, installed and
    maintained by people trained to do it.

    220 - 240 volts seems an optimum trade-off in terms of voltage and current.
     
  7. Rich Grise

    Rich Grise Guest

    When I was in Japan, it was 100V, but I get the point.
    To step down from 220V to 24V, or to 22.3V, you'd use a transformer.

    The reason that different voltage-rated lamps can have the same power
    requirements is that they have different resistance: The 22.5V, 50W
    lamp will draw 2.222A, while thw 24V, 50W bulb will draw 2.083A.

    Google "transformer" and "Ohm's law".

    Hope This Helps!
    Rich
     
  8. Jamie

    Jamie Guest

    we don't worry about that, you have 10 chances, you should be able to
    get it right some where along that number !:)
     
  9. redbelly

    redbelly Guest

    One advantage for low voltage: standard light bulbs are made of thicker
    wire (compared to the higher voltage version) to get necessary lower
    resistance. A thicker wire will last longer before burning out.

    Mark
     
  10. And 5 tube radios can have a series heater string. And Xmas lights are
    easier. But the disadvantages and losses outweigh all small advantages.
     
  11. Actually, the usual practice is to operate the thicker wire at a higher
    temperature to get more efficiency and whiter light rather than longer
    life.

    Compare European 230V and North American 120V lightbulbs of the same
    wattage.

    But now that fluorescent and compact fluorescent lamps are seeing some
    use that incandescents did, and more replacement of incandescents with
    fluorescents and compact fluorescents should be done when one is concerned
    with life expectancy or efficiency of the bulbs, this issue of filament
    thickness should matter less.

    - Don Klipstein ()
     
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