I want to make a power resistor network.

But i have two variables - resistor values,wattage.

I need to create any resistor values 0.1 to 20ohms and wattage ranging from 10W to 600W.

I was thinking of two options - 1. resistor network with all resistors with max wattage??

2. create a pool of resistors and then pick and use values/wattage when required.

Can you guys think of something better?

thanks
jis

 

I want to make a power resistor network.

For what purpose? The design of your network, and any advice we might offer, depends on what you hope to accomplish with it. Maybe a variable dummy load?

 

They will be used to simulate various loads like bulbs motors etc

 

How about an electronic load? http://www.circuitspecialists.com/array-3723a-electronic-load.html

The lower resistance values will be a problem.

Some idea as to what sort of signal the load sees may help a bit.

 

It will be only a DC output and current rating can cary from 1A to 20A

 

How about a kettle water heating element - I've seen them used as high power dummy loads....

 

I've seen just a long length of enamelled copper wire being used to simulate a low R load. The middle is submerged in a bucket of water, of course, any part not submerged runs the risk of getting hot very quickly.

 

The is a commonly recurrent question.

Have you done a forum search?

There are many factors to consider and your solutions depends upon what compromises you are prepared to make and what your personal resources allow.

How would you make a reliable connection to 0.1 ohms Where the connection resistance may be 0.3 ohms?

Some solutions form the past

http://forum.allaboutcircuits.com/showthread.php?t=95152&page=3

http://forum.allaboutcircuits.com/showthread.php?t=12372&highlight=load

see post 7 on this second one.