4 Bands

5 Bands

6 Bands

Resistor Calculator is a simple web application made with javascript proggramming and HTML5 framework to calculate A Electronic Resistor Color Code.

You Just have to input the resistors bands colors and then TADA!

The Value of the resistor will be calculated and a image will be simulated.

A Resistor is a electronic component which can resist voltage in a electrical circuit.

Here's Some Picture of it. First one is single one and the other one is Mounted on a printed circuit board aka PCB.

Now let's talk about how do we make the calculation to get the value of a resistor using its color code bands.

It's very simple.

Here's a chart of the meaning of the color codes,

Here, From the first band,

- The First Number of the resistor value
- The Second Number of the resistor value
- The Multiplier
- The Tolarence

Let's Do a simple math to make it more easy!

Suppose, We have a resistor with **Brown**, **Yellow**, **Red** and **Golden** Bands on it.

Let's calculate it's highest and lowest value.

At first let's gather the meaning of the color bands from the chart.

The Code For **Brown** is 1

The Code For **Yellow** is 4

The Multiplier For **Red** is 10^{2} or 100

The Tolarence For **Golden** is ±5%

The First two bands color codes stands for a same number.

So, The Resistor Value is,

Highest Value = 1470 Ω or, 1.47 Kilo Ohm

Lowest Value = 1330 Ω or, 1.33 Kilo Ohm

It is that easy!

**Note:**
For Five Bands, First 3 bands stands for one single number. And For Six Bands, First 4 Bands stands for one single number.

**But What is PPM?**

PPM is "Parts per Million"

It is calculated as **ppm/°C**

When the temperature of a resistor changes, the resistance value changes also.

Let's See A Demontration,

Suppose,

A Resistors Temperature coefficiency is 50ppm/°C

Meaning that the change in value due to a temperature change of 1°C will not be more than 50Ω for every 1MΩ of the resistor's value (or 0.05Ω for every 1KΩ of its value).

**Note:** The temperature coefficient quoted above would be typical of a metal film resistor. Carbon film types have temperature coefficients typically around 200 to 500ppm/°C

Tawsif Torabi

Web Developer, GR+ Bangladesh