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That's not always the case. One formula for power dissipated is:

P = IR

So, a higher resistance means that more power is dissipated - if the current is the same. The reason for this is precisely that resistance is related to the conversion of electrical energy into heat.

However, if you put a higher resistance across a specific voltage, you'll get less power dissipation, not more, since less current will flow at a higher resistance.

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Q: Why does largest R dissipate more power?
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