Can any one tell me plz?
Answer:
That is 240 Vac Frequency/ Cycle = 50 Hz.
US has 120 Vac 60 Hz. Cycle.
This means that rms value of main supply voltage is 240volts.
and frequancy of that ac voltage signal is 50 Hz.
It is an example of AC.
First of all it's 50 hertz. What that means is
that in one second of time the oscillations of the ac frequency is 50. Simply put if you wave your finger back and forth 50 times in one second. That would equal how many times the ac frequency is moving in one second.
240 volts means the the main (in houses only) has 2 lines of 120volts coming in. Alot of older house may only have 120v mains, which means only one line (hot and neutral) of ac coming to the house. Why they switched to 2 lines at 240v is because they can bring to the house double the amps with the smaller lines. The cost of wire that can carry 120vac at 100amps is 20 x as expensive as 2 that can carry 50amps. Plus in upgrading older 120 volt house, only one more line has to brought to the house, instead of a brand new 3 line wire which is 50 times more expensive due to labor and materials cost. Volts are the potential of electricity, and amps are how much pressure(load) behind it. For example. Imagine a great big water tower. The water represents the VOLTS, and the opening allowing the water to flow represents the amps. It's a very vague example, but it will give you a simplistic idea of their relationship. The US uses 60Hz. Why? Because the US must send their electricity alot farther and at a much greater potiential than 95% of the world due to demand. Plus, the math is alot eaiser, HA HA:)
This an example of AC (alternating current.) Vaguely ocillating DC.
Why ac over dc. If you tried to send dc to every house the lines would have to be the sizes of storm drain cement pipes, cost would be through the roof, let alone if a short circuit happened, you'd expirence something like a bomb (huge bomb) going off. AC is much easier to transmit through the lines because you you can step up the volt through step up transformers and reduce the amp thus making it much safer and allows smaller lines and less voltage line loss over great distances. Once the high voltage ac reaches your house a transformer then reduces the voltage thus increasing the amps for home usage. Thats what those transformers on the poles are for. If your wires are underground then you won't see them. But every one of use has seen those huge transformers on poles one time or another.
The answers post by the user, for information only, FunQA.com does not guarantee the right.
More Questions and Answers: