2006-08-26 19:51:15 · 8 answers · asked by awish 1 in Science & Mathematics ➔ Engineering
Completing Norsmen's thought...
The fact that you can boost the voltage means that you can transmit a lot of energy per second (power) down a long wire with a minimum amount of current. If you double the voltage, you can deliver the same power with half the current.
Any current in a wire results in heating and the energy dissipated as heat reduces the amount of energy you can deliver to the load. Higher voltage means lower current and thus more efficient power transfer.
On the other hand, you don't want to run your toaster on thousands of volts. It's too dangerous.
Just as an alternating voltage is boosted for transmission, it can be reduced to manageable levels at the point of use.
Thomas Edison originally wanted to distribute power using direct current- but it turned out that you'd have to have power stations every couple of blocks to deliver useful power to the customer because most of it would be dissipated by the high currents in the wires used to deliver it.
The down side of AC is that you have to rectify it (convert it to DC) in applications like radio receivers where you need a steady voltage.
2006-08-26 20:51:07 · answer #1 · answered by Fred S 2 · 1⤊ 1⤋
AC current can be used with a transformer to change the voltage or isolate the circuit
DC normally cannot be used with a transformer. There is a variation of DC called pulsating DC that can be used with a transformer.
2006-08-30 10:28:59 · answer #2 · answered by Anonymous · 0⤊ 0⤋
well there are lots of advantages and disadvantages...
like AC can be stepped up or down as per the requirement using transformers where as in DC this is not possible doing it in a single step....
Due to the presence of frequency component hysterisis and eddy current losses are incurred in AC where as in DC its not present
like this the list goes on
i hope this link would help you
http://www.wisegeek.com/what-is-the-difference-between-ac-and-dc.htm
adi
2006-08-27 03:35:52 · answer #3 · answered by Anonymous · 1⤊ 1⤋
AC can be transformed up or down(to a higher voltage or a lower voltage). DC can not
2006-08-27 03:03:23 · answer #4 · answered by norsmen 5 · 1⤊ 1⤋
advantage in ac current is electric shock will throw you away if you get contact with live wire.where as in dc current you sticked to he live wire.this is because the fluctuation changes from "+" to "-" in ac current where as in dc current the fluctuation doesn't changes
advantage in dc is the voltage variation of current is less.in ac current the voltage variation is high.
in ac current we can boost the voltage using the external devices like transformer or stabilizers.but in dc current its impossible
2006-08-27 04:32:44 · answer #5 · answered by gsm 1 · 0⤊ 2⤋
AC does not always using power, and DC is always using power. You can't drain out something plugged into an outlet, but you can drain a battery.
2006-08-27 02:59:11 · answer #6 · answered by nick_lupro 3 · 0⤊ 2⤋
In D.C. that is direct dynamo current the flow of electricity is from one side to other side only.In A.C that is alternative dynamo current each time it reverses it direction according to its frequency. For operating electronic equipments you need D.C.current. For operating electrical equipments you can design for both.A.C current can be converted to D.c by using rectifier. The voltage can be varied simply by using step down or step up transformers. The D.C can not so easily altered for its voltage.
2006-08-27 03:22:04 · answer #7 · answered by A.Ganapathy India 7 · 1⤊ 1⤋
as far as i know we can electrolyse with DC but we can't with AC
2006-08-28 03:59:50 · answer #8 · answered by eshaghi_2006 3 · 0⤊ 1⤋