![470k ohm resistor color code 470k ohm resistor color code](https://projectpoint.in/image/cache/catalog/MFR-500mW-1280x720.jpg)
Putting it all together we get: 1, 0, and two zeros (00) = 1000 ohms or 1k. The third colour tells us how many zeros the value has - red = 2 zeros. The second colour, black, has a value of 0 (zero). The first colour, brown, has a value of 1. Using the resistor above, its bands are brown, black and red. Finding the Resistor ValueĪ resistor's value in ohms is worked out from the first three coloured bands using the table below. The gold band tells us that its tolerance is 5%. The coloured bands that you see on the resistor tell us what its value is in ohms and what its tolerance is. The above resistor has a value of 1k (1000 ohms) and a tolerance of 5% - this means that its value could be between 950 ohms and 1050 ohms (1000 - 5% to 1000 + 5%). This means that its ohm value could be 5% greater or 5% less than its quoted value. The above resistor has a tolerance of 5%. Resistors have a tolerance rating given as a percentage. The higher the power rating a resistor has, the bigger its physical size will be. Resistors have a power rating - the above resistor is rated at 1/4W (or 250mW). The resistor above has a value of 1 kilo ohms which is written as 1kΩ or just 1k. Resistors have a resistance that is given in Ohms (symbol Ω), e.g.
![470k ohm resistor color code 470k ohm resistor color code](http://sc01.alicdn.com/kf/HTB1LnwNJVXXXXcZXpXXq6xXFXXXj.jpg)
When beginning electronics, we usually use quarter Watt five percent tolerance resistors (1/4W, 5%). There are two schematic symbols for a resistor that are used in circuit diagrams as shown below: