From Wikipedia's listing under the "war of currents" (http://en.wikipedia.org/wiki/War_of_Currents): In the alternating current system, a transformer was used between the (relatively) high voltage distribution system and the customer loads. Lamps and small motors could still be operated at some convenient low voltage. However, the transformer would allow power to be transmitted at much higher voltages, say, ten times that of the loads. For a given quantity of power transmitted, the wire size would be inversely proportional to the voltage used; or to put it another way, the allowable length of a circuit, given a wire size and allowable voltage drop, would increase approximately as the square of the distribution voltage. This had the practical significance that fewer, larger, generating plants could serve the load in a given area. Large loads, such as industrial motors or converters for electric railway power, could be served by the same distribution network that fed lighting, by using a transformer with a suitable secondary voltage. Bottom line: Less voltage drop across long distances of wire, and easily stepped up or down in voltage as needed. "One voltage fits all" approach.
You cant.
AC stands for Alternating Current and DC stands for Direct Current.
AC supplies are not given to DC gennies. A DC gen requires a mechanical prime mover.
Jim use dc supply in oscillator circuits to and ac out put.
A transformer is a device to convert high voltage AC to low voltage AC & vice-versa. It works on the principle of induction. Since induction occurs only in an AC supply, a transformer cannot work on DC.. So, it is not possible to convert DC supply to AC using transformer. You would need an inverter to convert DC to AC.
Radios use DC power supplies to operate. If a radio is powered from a mains AC supply, a power supply circuit will convert the AC supply to DC. Therefore, a radio may have both a DC and an AC power input but ultimately, the internal circuitry will always use DC.
You cant.
An 'inverter' takes direct current (DC) input from a battery and outputs alternating current (AC). This means that an electric drill that should be plugged into the mains, can be run from the inverter.
AC 220/240 volts
Linear power supply - An AC powered linear power supply usually uses a transformer to convert the voltage from the wall outlet (mains) to a different, usually a lower voltage. In the past mains electricity was supplied as DC in some regions, AC in others. Simple, cheap, linear power supplies running directly from either AC or DC mains, often without a transformer used. They used a rectifier and capacitor filter; the rectifier was essentially a conductor, having no sudden effect when operating from DC. A switched-mode power supply (SMPS) works on a different principle. AC mains input is directly rectified without the use of a transformer, to obtain a DC voltage. This voltage is then sliced into small pieces by a high-speed electronic switch. The size of these slices grows larger as power output requirements increase.
we can convert a dc supply to an ac supply using inverters. Its a common operation which we observe in our daily lives dc can be converted to Ac using an undulator.
Mains supply provides alternative current while battery provides direct current.
the universel motor can runs at both ac and dc supply.
Variable DC power supply is: Variable - you can adjust it DC - direct current, electrons (electricity) flows in only one direction power supply - power supply Together, it's an adjustable one-way power supply Hope you find this useful...
They can be, but most will be powered by a mains AC to DC transformer.
ac supply converted with dc supply
ac supply converted with dc supply