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Suppose if I want to purchase the 15 milli Ohm resistor , when I am thinking about the Power Dissipation.
In my circuit,
Max expected current is 5A and maximum possible power dissipation,
Pd = ILoad (max)^2 * Rsh = 5A * 5A * 15 mOhm = 375 mW
Does it mean that the resistor I choose that should be more than 375mW ?
Because, Can I choose if the resistor 15mohm with 1W and 1% . In this case, should I consider this resistor or Can I use this resistor for my circuit with above given requirements?
you'll want to think in terms of your power supply, not the resistor you're using. For example, if you have 5V and 2A coming out of a charging cable then you have 5 x 2 = 10 watts coming into your circuit and you'll want resistors rated for 10w plus a factor of safety.
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Posted:Apr 13, 2012
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