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Go Back   Laser Pointer Forums - Discuss Laser Pointers > Lasers > Drivers, Test-load, Power Supply, & Batteries



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Old 09-10-2011, 04:12 PM #1
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Default about the test load resistor

Hello!
Does it matter if I have 1ohm resistor or 1ohm 1R/1W resistor?

Tnx!


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Old 09-10-2011, 09:17 PM #2
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Default Re: about the test load resistor

Quote:
Originally Posted by nevo122 View Post
Hello!
Does it matter if I have 1ohm resistor or 1ohm 1R/1W resistor?

Tnx!
One (1) Ohm is one (1) Ohm...
The amount of current you push through it will
decide the wattage rating you will require...


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Old 09-11-2011, 06:16 AM #3
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Default Re: about the test load resistor

Easy way to calculate the resistors power rating is:

P = I squared x R

For example:
If you require say 1500mA (I) and you know your resistor is 1ohm (R) then:

1.500 squared x 1 = 2.25W's


You can even shorten the equation because your multiplying the squared current value by 1 which is the same the squared current.

So for a 1ohm circuit you could say:

Power = I squared.
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