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Why is voltage always stepped up and stepped down in multiples of 11?
Wiki User
∙ 13y ago
The reason is some thing historical. In olden days when the electricity becomes popular, the people had a misconception that in the transmission line there would be a voltage loss of around 10%. So in order to get 100 at the load point they started sending 110 from supply side. This is the reason. It has nothing to do with form factor (1.11). Nowadays that thought has changed and we are using 400 V instead of 440 V, or 230 V instead of 220 V.
Wiki User
∙ 15y ago
Wiki User
∙ 13y agothe form factor of sinusoidal waveform is 1.1
hence all voltages maintain in multiple of 11
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What is a current transformar?
A transformer is a device that converts electrical power to a different voltage and current potential. You may have one at your home that converts the 110-120 volt wall output to 6-12 volts. The input voltage is stepped down to a lower voltage; the input current is also stepped up by the same factor as the voltage is stepped down.
Where might a step-down transformer be used?
Step-down transformer is used at grid substations for feeding various substations which further step down the voltage for feeding distributing transformers and further step down transformers are used to supply the voltage for the consumer uses
Why you use ac for transmission?
AC is used for transmission because AC can be stepped up in voltage with a transformer, and then stepped back down at the destination. Since power is voltage times current, a higher voltage requires a smaller current to achieve the same power. Since the current carrying capacity of wires is based on wire size, a smaller wire size can be used to transmit the lower current.
What value for a transformer determines the amount of voltage that is stepped up or down?
For an ideal transformer, the voltage ratio is exactly the same as its turns ratio. So if, for example, there are twice as many turns on the secondary winding as there are on the primary winding, then the secondary voltage will be twice that of the primary and the transformer will be a 'step up' type.
Electricity in power stations is generated at 25 000 volts why is it transmitted across the National Grid system at 132 000 volts?
Voltage is stepped up to higher voltages for transmission in a power transmission system in order to reduce the current required to deliver a certain power and, as a result, to reduce the size of the conductors required. Remember that power is current times voltage, so increasing the voltage allows a reduction in current for the same amount of power. Also, remember that the size of the conductor is proportional to the amount of current alone. At the receiving substation, the transmission level voltage is stepped down to a distribution level voltage, typically in the range of 11 to 13KV. It is then stepped down to service level voltages at the local distribution transformer serving a business or a group of residences.
A voltage that has been stepped down is measured across the output terminals of a?
transformer
Are high voltage transmission lines 60Hz like the wiring in a house?
Yes, the frequency stays the same. Only the voltage and current change as the voltage is stepped down.
What is the function of step-down transformers?
The function of any transformer is to change one AC voltage value to another AC voltage value. A step down transformer will transform a higher AC voltage to a lower AC voltage. A step up transformer will transform a lower AC voltage to a higher AC voltage. The transmission of electrical power uses both of these types of Transformers. From the generation station the voltage is stepped up to a very high transmission voltage and at the end of the transmission line it is stepped down to a voltage that consumers can utilize.
What happen to voltage when a transformer is stepped up and stepped down?
A step up transformer increases the applied voltage. A step down transformer decreases or lowers the applied voltage. An example of step up transformers are the transformers (known as fly-backs) in old CRTs that stepped up voltage from 110 Volts to 25,000 volts. An example of step down transformers are the power bricks for laptops or any power adapter that step down the voltage from 110 volts to 12 volts, 9 volts or whatever is needed for your device. I must add that most (not all) power adapters also convert AC to DC.
Is tranformer used to increase or decrease AC voltage?
The function of any transformer is to change one AC voltage value to another AC voltage value. A step down transformer will transform a higher AC voltage to a lower AC voltage. A step up transformer will transform a lower AC voltage to a higher AC voltage. The transmission of electrical power uses both of these types of transformers. From the generation station the voltage is stepped up to a very high transmission voltage and at the end of the transmission line it is stepped down to a voltage that consumers can utilize.
What happens when current travels through the second transformer before entering your home?
The voltage is stepped down to 240VAC from 7200VAC
Why substation is called so?
The noun substation has one meaning - subsidiary station.It is a location where electricity is transformed or stepped down to lower voltage for distribution on intermediate voltage trunks.
How many voltage is produced by a generator in all power stations?
it really depends on the station and it is referred to as distributed voltage, Our utility is 69 kv or 69,000 volts. it is stepped down to a usable voltage by transformers for distribution.
Advantages of ac generators over dc genrators?
The output of an AC generator can be stepped up with a transformer. The high voltage can be more easily transferred over longer distances with higher gauge wire. At the destination, the high voltage can then be stepped back down with another transformer.
What range should the voltmeter be set prior to taking a voltage measurement?
If the voltage is completely unknown, a voltmeter should be set to the maximum range first, then stepped down to an accurate level.
What happens to the current if the potential difference is stepped-up in an ideal transformer?
In an ideal transformer, if the voltage is stepped up by a factor of x, then the current is stepped down by a factor of x. The end result is that the power, P=VI, is not changed. Again, this is in the ideal case.
Why do you step up and then step down electricity from a power station?
With transformers. To answer "Why": It is more efficient to use high voltage over long distances, so the voltage is normally stepped up to standardized potentials for the journey. When it gets to your home it is stepped down to the proper potential for standardized household appliances.
