Theorem AC Power and DC Power

DC power 

In the electrical system DC (Direct Current), the flow is always moving in one direction. Such as the river flows from the mountains to the sea, so the electrons flow from the negative end (pole where there are many electrons) to Positive end (pole where fewer electrons).

A little note: the actual electrons move from the negative pole to the positive pole, but the incidence of this cause as if there is movement of Positive Charge Poistif move from pole to negative so that an electric current is often said to be moving from positive to negative. This is actually a misguided product of our scientists in investigating the electrical prior to recognize the existence of atoms and electrons.

DC power utilization

The main drawback is the difficulty of DC power to raise or lower the voltage. Anyway, the DC power generator producer must produce the same voltage at the electrical appliance to be powered. As a result, the DC power is difficult and expensive to ship long distances. Had PLN currently using DC power system, each 2 km PLN had to build a power plant!

However, the DC power is ideal when the distance is not too far away. In addition it is also easy to DC electricity generated by batteries. Because it is not surprising variety of electronic devices, Computers, Laptops, TV, Radio, Camera, HP still using DC power.

AC power

In the electrical system AC (alternating current), the two poles are periodically exchanged. Imagine for example river water normally moves from the upper mountain to the sea. It turned out the next day the mountain collapsed to the depth of the sea, while the first seabed had risen to as high as a mountain. Of course, the river water will be reversed. Imagine the day after the situation returns to normal. River currents will reverse direction again. The same incident happened to the second pole of the AC system. Pole voltage + turns into - and then back again into +, and so on. In the production of electric air-conditioning system PLN Indonesia, within one second of the pole changed and back 50 times! (on the electrical system of the United States and Japan even 60 times). If depicted in the graph, the voltage change is seen as a sinusoidal wave.

AC power utilization

AC power is mainly used to transmit electric power over a distance away, from the generator to the homes of customers. For practical use, a variety of electrical appliances can immediately take the AC power. However suit each design, most of the equipment is in principle still using DC power. Because it was in their system there must be a function of converting AC power into DC (such as laptops, computers, and so on.

Historical records

AC power as the main power system, first used in Europe, while electricity DC in the United States. At the end of the 19th century, a war raged between proponents of DC power and AC power in America to determine which one is better. Power DC main supporters was Thomas Edison (inventor of the light bulb), while the main supporters of the AC power is Westinghouse and Nikola Tesla.

Edison fight by showing the dangers of AC power. He did not hesitate to execute dogs and feral cats using AC power. Towards the end of this war, Edison even execute an elephant named Topsy! These executions took place in public, and ultimately became the inspiration made electric chair to execute death row in the United States.

But eventually wins AC power and become the standard Generation and Transmission of Electricity in the world today.