Frequency

It's not really true; there are 400 Hz motors and systems on aircraft, for instance.

actually there are two standards set in the world for frequency according to voltage reference that are 50 & 60 Hz

50 Hz is standard at 220 volts and 60 Hz is standard at 110V mostly the industrial applications are designed keeping these things in mind i.e. most of them are designed to give there max at 50 Hz or 60 Hz

for instance a motor is designed to give maximum power at 50 Hz it will consume 220 volts at 50 Hz to give its max output but even then if u increase the frequency the frequency will increase no doubt it depends on the motor how much it can bear but in the end it will decrease the output power of the motor.....

hope u get my point..

None of that is really quite true, either.

Well,

I find that this part of the statement is true: "but even then if u increase the frequency the frequency will increase".

Never mind the butchered english. BTW, OP, "you" is spelled "y-o-u", not "u".

But just to be fair to the OP (amith), the "u" was from qayyumfaiz.

My apologies to you, amith.

In my zeal to be humorous, I wrongly attributed a statement made by qayyumfaiz to you.

Thanks, JohnDG for the heads-up.

The link below will give you some background information. Come back here if you have any more specific questions.

http://en.wikipedia.org/wiki/Utility_frequency

Next he will want to know why voltages are all in multiples of 11...

The sophisticated answer is: just because.

Actually, in my youth, far away and long time ago, I met different frequencies from DC and up. Lesser used ones died. That's it.

yeah like 240 x 415

Hi friends, good day to all...

Thanks to all who replied..

JohnDG given a link, which explains well....

and i have another doubt...

We have two different supply system.. 1-> 220V, 50Hz

2-> 110V, 60Hz.....

For any Electrical & Electronics equipment, we need to supply same amount of POWER by using both 220V & 110V supply system.... The equipment supplied with 110V draws more current compare to 220V... Is it True..????

please elaborate on this & Mention advantage of 110V system over 220V & Vice versa......

With regards,

Amith Raj.N

amith; Early electric in USA was 110/220 volts D.C., first A.C. was 25 C.P.S. or later 25 Hz, this worked well with light rail. a 220 watt load @ 220 volt equals 1 Amp, a 220 watt load @ 110 equals a 2 amp load, yes it is true. North America uses a 110/220 or 115/230 or 120/240 volts single phase. Perry

Hi Amith,

As you correctly state, the same amount of power is consumed by a device designed to use a 110 volt supply as an equivalent device designed for connection to a 220 volt supply.

All power distribution wiring has resistance, and resistance in source wiring leads to power loss, usually as heat.

The advantage of 220 volts compared with 110 volts is that half the current flows. If half the current is flowing through the same grade of wiring then applying Ohm's law, only a quarter as much power is lost to heating in the supply cable.

The advantage of 110 volts compared with 220 volts is that if a living being (animal or person) is placed accross the conductors, at half the voltage only half as much current will flow through that living being. This should therefore lead to half the likelihood of an accidental electric shock by touching the supply leading to a fatality or serious burn.

DISCLAIMER: ANY ELECTRICITY SUPPLY CAN CAUSE FATALITY OR HARM! Under no circumstances should anyone presume 110 volts supply might in any way be safe!

Kind regards,

CT

in the UK during hte conversion from DC to AC the first generators produced 50Hz, not by design more by accident, and it has stayed.

In the USA 60Hz became the norn.. not sure of the history, but at a guess it was to be different from the UK.

The science of power generation has then developed behind the first forms of generation

A 50hz generator needs a 50 hz=3000 rpm engine if big and diesel is enough speed.With a more complex generator (doble poles number): 1500 rpm .But never khz or some like that.-

This response may be fable so take it with the per verbal grain of salt. I was told many years ago 50 HZ was based on metric system and 60HZ was based on time as in 60 seconds in a minute. That was what they had to go on at the time same as Ford Model T wheel base width was same as technology at the time the Rail Road system.

Sorry, the metric system still uses 60 seconds in a minute. Wait, maybe the English use royal minutes of 50 seconds each?

I'll jump on lynlynch's nit-picking train for a second and mention that it should be "proverbial" - referring to a proverb - instead of per verbal.

This site may shed some light on this topic.. It sure did for me. http://en.wikipedia.org/wiki/Utility_frequency

Some of you guys and gals have forgotten or don't know the various 'power' formulae which include:- P=IE which translates to (P) power in watts equals (I) amps multiplied by (E) volts.

Therefore a 220vac systems (E) with a 10 amp fuse (I) can produce a maximum of 2200 watts of energy (P).

Further formulae include I=E/R which translates to (I) amps equals (E) volts divided by (R) ohms.

As for frequency ask Mister Herz about that.