220 volts Versus 120 volts

[donskister]

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 .........

 

[Homer J Simpson]

1. Hi guys! i noticed that every countries have their different
voltages supply

Google for Electricity Around the World.

 

[HKJ]

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...

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.

 

[Alison]

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

Mains electric shocks always give me the giggles. They bloody hurt though.
Cor!! that'll make you jump!

 

[Duane Attaway]

3. 220volts versus 120volts .........

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.

 

[Homer J Simpson]

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.

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.

 

[Rich Grise]

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...

When I was in Japan, it was 100V, but I get the point.

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.

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

 

[Jamie]

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.

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

 

[redbelly]

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.

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

 

[Homer J Simpson]

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.

And 5 tube radios can have a series heater string. And Xmas lights are
easier. But the disadvantages and losses outweigh all small advantages.

 

[Don Klipstein]

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.

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 ([email protected])