Different units are used in different parts of the world. If you need to make units conversion now you can do it automatically by one mouse click. Just click on >>THIS LINK<< to open online conversion of almost all units you can ever need. These units are not only from area of electronics.

Often you need to read resistor value that is color coded. You can do it by finding color values in table or you can do it easy way by using automated online resistor color code value calculator below. Depending on resistor tolerance and production technique, it can have four or five color code. Carbon film resistors usually have 5% tolerance and 4 colors code, while more precise metal film resistors have 1% tolerance and 5 colors code mark.