11-17-2014, 01:38 PM
Art,
roughly speaking, if you know your resistance, it is that 133 Ohms times 0.3A squared, so it is 12W or so.
Given the length of the cord it is not too bad. And this is the power you have to dissipate.
A compact resistor however is a sizeable thing, especially considering the fact that it should be sized to 2-3 times the dissipated power.
This is a 30W 115 Ohms resistor. (just to give you an idea, you should probably be closer to that 133 Ohm).
http://www.mouser.com/ProductDetail/Vish...s6Dg%3d%3d
roughly speaking, if you know your resistance, it is that 133 Ohms times 0.3A squared, so it is 12W or so.
Given the length of the cord it is not too bad. And this is the power you have to dissipate.
A compact resistor however is a sizeable thing, especially considering the fact that it should be sized to 2-3 times the dissipated power.
This is a 30W 115 Ohms resistor. (just to give you an idea, you should probably be closer to that 133 Ohm).
http://www.mouser.com/ProductDetail/Vish...s6Dg%3d%3d
