Can I Replace a 0.5W Resistor With Two 0.25W Resistors in Series or Parallel?

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#31 4083072 15 Jul 2007 10:49

zybex zybex

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Post #31
4083072 15 Jul 2007 10:49

So if I connect a 0.1W resistor in series and, for example, 10W, the power will be added? I wonder if this small resistor will cope with a circuit with significant power, or maybe we will only see smoke for a short while?
My answer is that if we connect different resistors in series (when it comes to their power), the resultant power will be the same as the resistor with the smallest power. I write this as a practitioner, not a theorist.
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Topic summary

The discussion centers on the behavior of resistors when connected in series and parallel, particularly regarding their resistance and power ratings. When resistors are connected in series, their resistances add up, but the power rating of the combination is limited by the resistor with the lowest power rating. For example, two 0.25W resistors in series will not provide a total power rating of 0.5W; instead, they will effectively have a combined power rating of 0.25W. In contrast, when resistors are connected in parallel, their power ratings can be added together, but the total resistance decreases. The conversation also touches on practical applications, such as using multiple lower-rated resistors to achieve a desired resistance and power rating, and the implications for devices like light bulbs and high-voltage circuits.
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