is the following statmenet rue or flase? to prevent over-heating wires, voltage is decreased for long-distance transmission
2006-12-05 13:48:55 · 13 answers · asked by lex 1 in Science & Mathematics ➔ Engineering
False. The voltage is actually INCREASED for long-distance transmission.
The generating station generates a relatively low voltage, which is then stepped up at the grid input point. This allows the electricity to travel over long distances without significant line losses.
When the electricity exits the grid at a substation, the voltage is stepped down so you can use it in your home.
One note though: when voltage is increased, the amperage (current) decreases, and vice versa. This may be what you're thinking of.
2006-12-05 14:03:35 · answer #1 · answered by Javed 1 · 1⤊ 0⤋
Flase.
Using Ohm's Law, we see: V = IR. The total power is measured in watts, or volt amps. This means the power is P = IV. And the power loss through heating is something like (I^2 R). If you were to reduce the voltage and maintain the same power transmission through the line you would have to increase the current (I). This would increase the amount of energy lost due to heat (I^2 R).
To reduce the loss of energy through heating power lines, they INCREASE VOLTAGE and decrease current.
2006-12-05 23:09:46 · answer #2 · answered by Ian 2 · 2⤊ 0⤋
Line loss is less with high voltage and low current per Ian above.
Also, high voltage acts as a "weed-cutter" and clears any potential "leaks" like foliage and bird shorts (a low voltage signal might get stopped or leak transients, but with high voltage, there is a large pop, a bright light and ... bye-bye limb, bye-bye bird).
By the way - your statement is "false". Transmission line level voltage is very high - 480,000 volts.
2006-12-07 22:13:31 · answer #3 · answered by www.HaysEngineering.com 4 · 0⤊ 0⤋
FALSE, voltage is increased, this lowers the current carried by the wires and lowers loss due to heat.
2006-12-05 21:50:44 · answer #4 · answered by Scooter_MacGyver 3 · 1⤊ 0⤋
False
Voltage is increased and current is decreased to prevent heating. That way the same amount of power (V * I) is delivered with lower current.
2006-12-05 21:51:38 · answer #5 · answered by Anonymous · 1⤊ 0⤋
This is absolutely false.
The transformers you see on the top of the telephone poles are used to step the voltage down to 120 V/AC for use in the homes.
2006-12-05 22:25:25 · answer #6 · answered by LeAnne 7 · 0⤊ 1⤋
false what was the equation for voltage?
2006-12-05 21:52:06 · answer #7 · answered by Meatball 2 · 0⤊ 0⤋
false...
i think you will find it is amps that cause the heat not volts
2006-12-05 21:52:00 · answer #8 · answered by Anonymous · 0⤊ 0⤋
false
2006-12-05 22:15:58 · answer #9 · answered by yeah , yeah whatever 6 · 0⤊ 0⤋
FLASE! NO.... I MEAN RUE!
2006-12-05 21:50:29 · answer #10 · answered by Tempo 2 · 0⤊ 1⤋