✓ How To Resistor

How To Resistor

The ballast resistor is used to limit the current through the led and to prevent that it burns. To create a resistor with a small resistance or ohm value use a thicker shorter wire as the path between the two electrical leads.

Resistor Color Codes

Resistor Colour Code And Resistor Tolerances Explained

How To Identify Resistors 10 Steps With Pictures Wikihow

Turn the resistor so the three rainbow bands are on the left.

How to resistor. That means the voltage drop over the resistor will be 9v 2v 7v. The final band is called the tolerance and it tells you how. The resistor value would have been sufficient to reduce current flow to a value that could be safely conducted by the series device with the lowest allowable current value.

The resistive value of the resistor is controlled by increasing the desired thickness length or type of deposited film being used and highly accurate low tolerance resistors. Again with parallel circuits the total current is divided so a current limiting resistor may not be necessary depending on the number of branches and resistance of each. Give each color a number according to its resistive value.

Such a resistor is often called a ballast resistor. Using the formula for power dissipation we find p 7v7v 350 ohm 014 w. The last band gives the multiplier.

Make sure to read the value of the right most color band to determine the tolerance of the resistor. To read an axial lead resistor hold the resistor so the gold or silver band is facing to the right. Heres how you use the color code to figure out the nominal value of the resistor refer to the figure.

Surface mount resistors generally have a ceramic substrate body onto which is deposited a thick layer of metal oxide resistance. On most resistors youll see there are three rainbow colored bands then a space. To create a resistor with a larger ohm value use a thinner longer wire.

The simplest circuit to power an led is a voltage source with a resistor and an led in series. A rule of thumb is to find a resistor with twice the power rating. Read the color bands from left to right.

Usually the colored band at one end is closer to that end than is the colored band at the other end. The first two of the rainbow bands tell you the first two digits of the resistance. If the voltage source is equal to the voltage drop of the led no resistor is required.

Compare the ends of the resistor. So we need a resistor with a power rating of at least 140 mw. Then jot down the sequence of the colored bands reading from left to right.

Decoding the nominal value of a resistor. Decide which band is the first band. For example a resistor with brown green and green bands is rated at 15 mega ohms 15000000 ohms.

The colors on the first 2 or 3 bands correspond to numbers from 0 to 9 which represent the significant digits of the resistors ohmic value.

How To Read Resistor Color Codes Diy Electronics