alleryIf the current in a fixed resistor doubles, the heating power becomes how many times?
ATwo times
BHalf
CSame
DFour times
Answer & Solution
Correct answer: D. Four times
1. Power is proportional to I squared times R.
2. Doubling I multiplies I squared by 4, so two times is wrong.
3. So the power becomes four times.
_Source: Wikipedia, Electric current, Resistive heating_
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