bkit 220 volts?

[rdpzycho]

Walang kinalaman ang size ng conductor sa pagtitipid sa transmission line.  It all has to do with power losses transmitting electricity through the conductor.  For the same size conductor, at 220V, there is less current flowing through the line compared to 110V and hence lower voltage drop accross the whole power line which results to less power wasted sa line.

AFAIR, large part of it is losses due to voltage drop to finite resistance in the transmission, and one part is cost of transmission line (use of larger diameter to compensate for voltage drop). dahil para ma-achieve 'yung same required maximum voltage drop, kailangang gumamit ng ~3 times conductor area sa half voltage (110V), resulting in ~3 times more volume of copper needed than 220V.

Over long distances, larger conductors become expensive, and it is preferable to redesign the circuit to operate at a higher voltage. Doubling the voltage halves the current required to deliver the same amount of power, halving the voltage drop, and an additional doubling in efficiency is realized because that drop is a smaller fraction of the total voltage.
This is the motivation for commercial high voltage electrical power distribution, and for the use of the +12V power supply rail for high-power loads in modern personal computers.

IIRC, sa US 220V ang entry then split to 110V with one wire to GND, para mas efficient ang distribution at mas maliliit din ang wires na gagamitin sa bahay with power appliances.

[ahlburuto]

AFAIR, large part of it is losses due to voltage drop to finite resistance in the transmission, and one part is cost of transmission line (use of larger diameter to compensate for voltage drop). dahil para ma-achieve 'yung same required maximum voltage drop, kailangang gumamit ng ~3 times conductor area sa half voltage (110V), resulting in ~3 times more volume of copper needed than 220V.

Over long distances, larger conductors become expensive, and it is preferable to redesign the circuit to operate at a higher voltage. Doubling the voltage halves the current required to deliver the same amount of power, halving the voltage drop, and an additional doubling in efficiency is realized because that drop is a smaller fraction of the total voltage.
This is the motivation for commercial high voltage electrical power distribution, and for the use of the +12V power supply rail for high-power loads in modern personal computers.

IIRC, sa US 220V ang entry then split to 110V with one wire to GND, para mas efficient ang distribution at mas maliliit din ang wires na gagamitin sa bahay with power appliances.

+1000

[ahlburuto]

Green wire symbolizes neutral wire, not ground wire or return wiring. yung mga green na wiring o may green strip sa insulation dapat neutral wiring, ang uses nito ay kung may leak o induction sa equipment dito kaagad daraan ang kuryente para hindi makakuryente ng tao(safety purposes). At dapat maganda at pagkakabit sa earth grounding.

Hindi rin ito safe hawakan kung may leak ang equipment mo(lalo na kung hindi naka-earth ground). Daraan sa iyo yung kuryente.

Tama ko lang ito. Green or Green with yellow stripe eh international color for ground. At all time this should be connected to ground. For safety reason. At kung meron kang devices installed like GFCI or ELCB.

Ang neutral color eh white. Eto yung malimit.

Iba ang Ground at iba din ang Neutral, although pwede syang connected pero they have different purpose.

[Mystique]

AFAIR, large part of it is losses due to voltage drop to finite resistance in the transmission, and one part is cost of transmission line (use of larger diameter to compensate for voltage drop). dahil para ma-achieve 'yung same required maximum voltage drop, kailangang gumamit ng ~3 times conductor area sa half voltage (110V), resulting in ~3 times more volume of copper needed than 220V.

Over long distances, larger conductors become expensive, and it is preferable to redesign the circuit to operate at a higher voltage. Doubling the voltage halves the current required to deliver the same amount of power, halving the voltage drop, and an additional doubling in efficiency is realized because that drop is a smaller fraction of the total voltage.
This is the motivation for commercial high voltage electrical power distribution, and for the use of the +12V power supply rail for high-power loads in modern personal computers.

IIRC, sa US 220V ang entry then split to 110V with one wire to GND, para mas efficient ang distribution at mas maliliit din ang wires na gagamitin sa bahay with power appliances.

^
Tama ka dyan bro 100%.  Ang sa akin lang ay ang history kung bakit 220V at hindi 110V.  From my earlier post below, back then they don't have the option of using different size conductors and have to make use of existing copper infrastructure.  I guess the rest is history why 220V and 110V is still being used in Europe and the US. 

Originally Europe was 120 V too, just like Japan and the US today. It has been deemed necessary to increase voltage to get more power with less losses and voltage drop from the same copper wire diameter. At the time the US also wanted to change but because of the cost involved to replace all electric appliances, they decided not to. At the time (1950s-60s) the average US household already had a refrigerator, a washing-machine, etc., but not in Europe.

 

[pheona]

parang dumaan yata sa total devastation ang europe during ww2 kaya nagkapwede silang magpalit to 220vac. unlike sa u.s. na continues yong mga gamit nila na 110vac, same as japan. sa atin naman siguro 220vac dahil sa implewensa ng spain na european country. hindi ko lang mabasa if "la elektrisidad" at meralco is using this voltage during spanish at american era dito sa atin.

[rdpzycho]

mas marami atang gamit 'yung mga kano kaya napilitan silang mag-dual voltage.

sa Europe ata ilang bansa lang ang may kuryente na at may mga gamit kaya hindi magastos magpalit from 110V to 220V.

dito mas efficient sa distribution (220V) tapos mas efficient sa generation (60Hz).

[pheona]

^ matanong ko lang sir Rd....

sabi sa wiki 1895 pa ata may kuryente na dyan sa maynila, ano po ba ang istorya ng voltahe natin? galing din kaya tayo sa 110v? o deretso nang 220v? by that time kasi wala pa yatang pinoy na electrical eng'r  e  

[ece.joanne]

example 100W load.

P = VI

110V

I = 100W/110V = 0.91A

220V

I = 100W/220V = 0.45A

to produce same power, kalahati lang ang current na kailangan ng 220V against 110V.

ah gets ko na may kinalaman pala ito sa ohms. law..

reading....

[pheona]

^ yeh it can be clearly seen sa Ohm's Law:

@ same load and same line conductor condition:

the lower the voltage the higher the current the higher the current the higher resistance the higher the resistance the higher the temperature the higher the temperature the higher the voltage loss and the higher the voltage loss the lower the voltage (then read it again)  


sir Rd approximate it @ 3X losses at a half voltage difference  


Power Loss:

P = I^2 x R

increasing the voltage will minimized the losses component I.
increasing the conductor size will minimized the losses component R.

at saka;

Power = V^2 / R

it can be noticed that V is squared againts the power deminishing R.

[pjarina]

Walang kinalaman ang size ng conductor sa pagtitipid sa transmission line.  It all has to do with power losses transmitting electricity through the conductor.  For the same size conductor, at 220V, there is less current flowing through the line compared to 110V and hence lower voltage drop accross the whole power line which results to less power wasted sa line.

 

There is no transmission voltage rated 220 volts sa bahay lang un. Transmission voltages are step up to 138 kv and 69 kv. At higher voltage, power transmission need not require high current.

If transmission lines were to operate at 220 volts, just imagine how big will be the required conductor.

[marleytrical]

Pag 110volts system ang gagamitin natin dito eh mas malaking size of wire na ang kelangan natin. Malaking size of secondary transformer. Pati sa house wiring and building wiring. Mashadong mataas ang cost of materials. Although mas hindi delikado ang 110 compare sa 220.

Wala atang kinalaman dito yung humidity.

meon naman po kahit konti ksi bse on my experience in electrical pagmalamig ang panahon mas madaling nakokoryente ang tao unlike pagtuyo ang lugar wala moisture ang hangin.

[pjarina]

meon naman po kahit konti ksi bse on my experience in electrical pagmalamig ang panahon mas madaling nakokoryente ang tao unlike pagtuyo ang lugar wala moisture ang hangin.

Pag madaling makoryente dahil lang sa moisture ng hangin, dapat ang outdoor electrical enclosures may Nema rating na 3R. Ang maayos ang insulation sa mga splicing.

Dapat kasuhin ang electrician and electrical inspectors na pumalpak tungod sa dili pagsunod sa PEC instructions.