Which electrical device makes it possible to transmit electrical energy efficiently from a power plant to users?

Answer 1

It all depends on loads anddistribution control capabilities. A generation plant can only supply so much power if the power is exceeded then peakers can be brought up to sustain the demand the response time varies greatly from county to county and country

Answer 2

The loss of power through any conductor, including a long-distance transmission line,

is I2R . (R = resistance of the conductor, I = current through the conductor.)

'R' is a property of the cable. It's made as low as possible, but at some point, you're

stuck with the resistance you've got. At that point, what else can you do to minimize

loss in the cable ?

Since loss is I2R, the current is "low-hanging fruit". If you can reduce the current

by 1/2, you slash the losses by 75% . And if you reduce the current by 90%, the

losses are reduced by 99% .

Power through the line is ( V x I ). The way to ship the same amount of power at

lower current is to ship it at higher voltage.

That's why long-distance power transmission is done at super-high voltage, like

hundreds of thousands of volts. It gets stepped down when it reaches your city,

again when it reaches the substation in your neighborhood, and once more on

the pole in the alley just before it goes into the 10 or 15 houses on your block.

Each step-up out of the generators and step-down for local distribution is done

with Transformers.

By the way ... This is another reason why AC won out over DC for long-distance

transmission. Transformers only work with AC, so none of this would be possible

with DC.

Answer 3

The electrical "wire", often grouped into a bundle of several wires

configured in parallel connection and known then as a "cable".

Answer 4

Electrical energy is usually transmitted over cables. It is usually transmitted at high voltages, to reduce the current, and thus reduce power losses.