Understanding power
When we start discussing the related field of electronics, then it does not loose connection with the electric field of knowledge with all the problems, both regarding electrical components, electrical parameters, terms of electricity and electrical symbols.
Electricity itself can not actually see with our eyes, but the electrical phenomenon we can see in everyday life. We can know the power that for example: the existence of electric lighting in the homes, the electricity comes from sources of electricity generated by power plants that are managed by the state electricity company (PLN). Symptoms of electricity also can be seen on the lamps mounted on a motor vehicle in which the electrical source from the battery or batteries (accumulators), apart from the electrical phenomenon that can also take a look at the appliances that use electricity such as: radio, fan angina, strika and others. Thus the actual electrical phenomenon that can be encountered in everyday life and is not a strange thing.
Various kinds of electric currents
Basically, we know two kinds of electric currents generated by power sources, namely:
Electrical alternating current (AC).
alternating current or in default language called Flow AC or Alternating Current. In general, alternating current electricity is widely used in everyday life such as home lighting and other household utilities such as running a fan, iron, and so lain.Listrik alternating current power source is generated by an electric voltage is called Alternating current generator contained in the centers of power plants.
In general, the voltage of electricity used for general corporate purposes which are standardized nationally and 220V/AC 110V with a frequency of 50Hz.
It should be noted that the electrical voltage either 110V or 220V/AC useful addition to humans, is also very dangerous if not treated carefully, not to avoid the flow of electricity is moved by hand especially by children.
Electrical direct current (DC).
Direct current or in default language is called Direct Current or AC current. If we consider that there are lights on motor vehicles, no other source of power derived from batteries or accumulators (batteries).
Battery is included source of electricity that can generate electricity voltage direct current (DC).
With the development of electronic tekologi current, direct current electricity (DC) can be generated by changing the alternating current (AC) into direct current (DC) using an instrument called a power supply or adapter, this device functions as a charger transformer premises found on cell phones.
The current in the circuit
Electric current is the electric charge moving in the connection or the component. If the flow out of somewhere less than the current into the place, then the charge on the ground will continue to multiply. But this is not possible because the electric current that goes into one place will always come out of it too. The meaning of these laws of physics to a circuit can be described as follows: if there is a series circuit, means there is no branching in an electric current flow is always the same in every part of the series circuit. If there is a branching point where the stream branched flow in a circuit, then the amount of current into the branching point was always equal to the amount of current from the point of branching out from it.
About Signal
Analog Signal.
Electrical energy (current or waves) can store information when made in certain vareasi and unit specific time (called intensity). Vareasi tersubut electrical energy has been termed the signal (signal). The signal is divided into two types, namely analog and digital. Sine wave is an example of an analog signal. These waves can mengalis via cable or air, wave vareasi sinya
Digital Signal
Another type of electrical signal is a digital signal, which has the same type as the computer environment. Unlike the sine wave signal having a gradual difference between the highest point with a low point, the digital signal vareasi occur between the signal value to one another so that there are only two values in the digital signal, namely high and low. Digital signal will mepresestasikan information on the pattern of high and low. Ting and low pattern is used to represent sounds in mobile phone technology.
Change the voice signals into digital signals
When people give voice to generate acoustic pressure that can mmerambat in the telephone cable. For example, by creating a vibration, will cause the sound waves will propagate from one end to ahir from one place to another. Telephone, will reproduce the sound by using electricity or electrical items at a certain distance of the wave transmitter and receiver equipment interconnected by wires or cables that will deliver listrikPada current wireless technology, kode0-coded in the mobile phone is akanmelakukan conversion of sound to transmitting digital pulses on the side. On the receiving side will do the conversion from digital back into analog beats. Coder or vocoder is a sound analyzer with a sintetizer. Vocoder in each digiatal wireless phone is a chip set called a digital signal processor (DSP). Sura will be modeled and ditraqnsmisikan by the analyzer as the vocoder. At
received, the synthesizer will menginterpresentasikan signal and reproduces the approach in accordance with the original sound.
Normal sound of music, tone, and all analog signals will dsikonversikan by telephone to electrical waves. These electrical waves in analogy to the sound. The sound will affect the telephone circuit, electronically will represent the sounds into a continuous electromagnetic wave. Transmission of analog signals are sometimes affected by distortion. However, in digital systems to these problems have been overcome.
Digital signals are systematically and numeric representation of sound, each sound will be captured sebgai nunasa binary digits.
Sound reproduction will be very easy to do by giving kode0kode numbering in the form of digits. There are schemes that contain errors or mistakes unatuk be examined and repaired so that the digital link in the wireless system will always be intact. To reduce bandwidth, the data signal can be compression or data compression
