Resistor

Resistor can be assume like a piece of board used to resist the heavy flow of water in the ditch. By using this this board the water flow can be blocked. This parable can be used in electrical resistance. Can be concluded that the resistor is a component that functions to the flow of electricity. Resistor with proper resistance value for a circuit can operate perfectly.

Generaly the function of resistors are as follows:

1. Give electric current to fit the needs of an electronic circuit.
2. Reduce the required voltage to the circuit.
3. Working with transistors and capacitors in a circuit to generate a low frequency and high frequency.
4. Voltage divider.

Function of Resistor as a barrier to the flow, accordance with the equation:
I = V / R
Where:
I = current (amperes).
V = voltage (volts).
R = resistance (ohms)

To determine the value of these resistors can be done by reading the color code, code numbers or measured directly with a ohm meter. In reading the color code can be seen in the bracelets found on the body of the resistor as shown in the picture below:

In the picture above the color rings shows things as follows:

• Ring to 1: shows the number to 1.
• Ring to 2: shows the number to 2.
• Ring to the 3: is a multiplier factor of the first and second digits.
• Ring to 4: shows the amount of tolerance resistance.

Resistor as the resistance are divided into two types:

1. Fixed resistor

• Fresh Metal Resistor, such as resistor  coiled metal wire on the surface of glass tube.
• Charcoal resistor, this resistor is the most widely used in electronic circuits.

2. Variable resistors, the amount can be adjusted to the needs in electronic circuits, generally known as a potentiometer. Potentiometer can be divided into two forms for use in the industry.

• Displacement Potentiometer = often used in the equalizer.
• Turning Potentiometer = often used in setting the volume, bass, treble and so on.

Symbol Resistor