# Basic Of Resistor, Symbol and Ohm’s Law

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## Definition of Resistor

Symbol of Resistor – In electronic devices, if you have ever seen a component like the picture below, its name is Resistor. But resistors are not just like the following picture, there are many versions, you will read the article below.

This component is the most basic component and Symbol of Resistor that you must know if you want to play in the field of electronics, because it will be very widely used.

Resistor is a passive component to reduce current flowing in an electrical circuit. Resistor comes from the word “Resist” which means to reduce, hold, block, reject or inhibit.

The ability of a resistor to carry current is called resistance.

We can analogize that electric current is like water. While the resistor is a water pipe.

When water flows in a clean pipe, the amount of water entering is equal to the water leaving. However, if the pipe is dirty inside, has a lot of moss or there are lumps of soil, then the amount of water that enters is not the same as the water that comes out.

Well, the pipe was also called the Resist component, because it has blocked the flow of water with the presence of moss and lumps of soil. The amount of the resistor’s ability to block electric current, depends on the resistance value.

The greater the resistance value, the greater the ability to inhibit electric current. Resistors are called passive components because these resistors do not require an energy source from other components to be able to inhibit electric current.

### Symbol of Resistor

Resistor symbols such as jagged or zigzag are American and Japanese standard resistor symbols often known as ANSI (American National Standards Institute), while square is a European standard and is often known as IEC (International Electrotechnical Commission). Some Symbol of Resistor are as follows:

### Ohm’s Law and Units

The unit value of this resistor is “Ohm”. The current flowing in the resistor (A) is equal to the voltage across the resistor (V) divided by the resistance (R).

I = V / R

While the power consumption (P) of a resistor is equal to the current flowing (I) times the voltage across the resistor (V).

P = I x V

Using another formula, the power consumption of a resistor is equal to the square of the current (I^2) times the resistance (R).

P = I^2 x R

The complete formula and Ohm’s Law Calculator, please go to here.

Next we will learn about Resistor Types, based on Value, Shape, Raw Material and Usage. Read more here.