Each color, in these rings, stands a number. Here is a table show their relation:

There are also two special color stands for measurement error. Gold stands a measurement error about ±5％ and silvery for ±10％. Some times, other colors like brown or green can also show the measurement error when the printed on the last ring. Brown for ±1％ red for ±0.2％ and green ±0.5%. www.zhangpeng.info

There are two kinds of resistance: resistance with four rings and resistance with five rings. The rings stands for the similar meaning. The key to judge a resistance is to identify the sequence of each rings. There are two ways to judge the sequence. Judge by the space between rings or distinguish the color that shows  measurement error.

Judge by the distance between rings

There have a different space between rings. The last space is always longer than first step. You can carefully check your resistance.

Distinguish the color that shows  measurement error first

As I told you above, gold and silvery always show a measurement error. If a resistance have a ring with color gold or silvery, it’s useful to identify the list by its special color.

Examples

On a resistance, the color ring show more details besides only numbers.

For a resistance with four rings, the first two rings show you the number. The third one tell you how many zeros behind the number.

The only difference between resistance with five rings and four rings resistance is that there are three rings show the number in the former one.

Here I give you a simple example:

You had know red for 2, purple for seven and there is just one zero behind it. So the exact resistance is 270Ω.

Here you see an simple desiccant system .

desiccant system

At day , refrigerant turn to vapor and the pressure in absorber increase . Vapor flow to a condenser and then be cooled there . We store this liquid. www.zhangpeng.info

When the temperate of environment decrease and there are no enough radiation , absorb medium then absorb vapor . Pressure in evaporator decrease. According to heat transfer law, we know the left liquid will turn to vapor and the temperate goes down . We use this phenomenon to cool the air in the building.

To know more about desiccant system please see our PPT :

http://docs.google.com/Presentation?id=dhhmxwkj_3c6ckh4d9