# Why are transformers important to electric power distribution

• joyxx
In summary, transformers are important because they save energy and eliminate the risk of high voltage in houses.

## Homework Statement

Give two reasons why transformers are an important part of the power distribution grid

thank you

Have you done any research on the web? Perhaps try a search on topics such as "reasons for using transformers in power distribution".

bhobba
I can tell you, my father was an electrical engineer who worked on this sort of stuff and explained it all to me one day, but I just did a simple google search and can confirm the answers that came back were correct. We generally like people to discover/nut out stuff for themselves when possible rather than us telling them. This is an easy one, but if you still don't understand get back with what doesn't make sense and me or someone else will give a careful explanation.

Thanks
Bill

I can tell you two reasons but without many details so you ll have to read your book to find out more, or google about them

1) To save energy. This , briefly, is accomplished by using transformers to rise up the voltage (up to 10kV) at which the energy or power is transferred through the power distribution network. Those rise up transformers are usually located near the power plant where the energy is produced. You ll have to read up here some more why exactly power is saved over the power network when the power is transferred with high voltage.

2) To eliminate the risk of having high voltage in our houses This is accomplished by using transformers that lower down the voltage from 10kV down to 110 or 220v for domestic use. These transformers are located in various points inside or near the town/city.[/B]

gneill said:
Have you done any research on the web? Perhaps try a search on topics such as "reasons for using transformers in power distribution".

For this specific question I'm not allowed to search it up on the web. My lesson said I have to use information in my notes. but I have looked through my lesson over and over again and can't find anything to answer the question

Do you notes contain Ohms law? How about the equation for electrical power? Some hints..

1) See post #4.
2) Towns and cities need power. Power = Volts * Amps. Within reason the designer of the power transmission network could choose to send the city any two values of voltage and current that satisfy that equation.
3) The power loss P in a wire that has resistance R can be calculated using P=I2*R.

How does this info effect the choice of voltage and current that should be sent to the city?

bhobba
joyxx said:
For this specific question I'm not allowed to search it up on the web. My lesson said I have to use information in my notes. but I have looked through my lesson over and over again and can't find anything to answer the question
So look in your notes (since we cannot see them). What does a transformer do? How does the voltage and current on one side compare to the other side. Is there a way to take advantage of these relationships.

I am guessing the answer to some of my questions will be in your notes, and I am guessing that they want you to try to come up with ideas from what you know (from the notes).

Are you allowed to have study groups? If so then definitely form or join one. I find they help tremendously.

CWatters said:
The power loss P in a wire that has resistance R can be calculated using P=I2*R.

More power dissipated by the line means more losses in transmitting it, bigger conductors mean heavier wires that need to be supported - I am sure you now get the gist. Also note if you transmitted at the voltage used by the consumer there will be some loss. Companies promise to supply voltage between certain limits - again I am sure you can see the inference.

Thanks
Bill