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Resistors Explained and Symbol

Resistors Explained and Symbol - Resistor is one of the passive components that functions as a barrier to the flow of electric current in an electric circuit. It is said to be a passive component because resistors do not need an energy source from other components to be able to inhibit electric current. 

This resistor is a basic electronic component that must be the neatest friends. Due to the use of this component in electronics it cannot be removed. Almost all circuits require a resistor. 

The value of the resistor is "Ohm" Ω. In Figure 1 there are two resistor symbols that are most often used. Resistor symbols such as the jagged or zigzag are the symbols of American and Japanese standard resistors, while the square is the European standard.
In short, we can analogize that the electric current is water. While the resistor is a water pipe. When water flows in a clean pipe, the amount of water entering is the same as the water that comes out. However, if the pipe is dirty inside, has a lot of moss or there are clumps of earth, then the amount of water that enters is not the same as the water that comes out. Well, the pipe is also called the Resist component, because it has obstructed the flow of water due to the presence of moss and soil clumps.

Resistors are exactly like that friends, the amount of their ability to inhibit electric current, depends on the value of their resistance. The greater the resistance value, the greater it inhibits the electric current. In Figure 2 is the physical form of resistors that are commonly sold in the market.

This resistor is shared by two types of friends. Resistors with a fixed resistance value and resistors with variable resistance values. Resistors with a fixed value are called fixed resistors while resistors with a changeable resistance are called variable resistors. Fixed Resistors are very many derivatives or types depending on the constituent material of the resistor itself, but in general, based on the material of manufacture, currently divided into four major groups, is:
- Carbon Resistors (resistors made with carbon materials)
- Film resistors (resistors made with metal oxide materials are usually low power)
- Wire-wound resistors (resistors made with wire wound are usually high power)
- Semiconductor resistors (resistors made with semiconductor materials).

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