Electric Power
Power dissipated in resistor R with current I?
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About This Question
- Subject
- physics
- Chapter
- current electricity
- Topic
- electric power
- Difficulty
- Easy
- Year
- 2025
Solution
- Basic Definition: Power (P) is the rate at which electrical energy is converted into heat (Joule heating).
- Formula derivations:
- From definition: P=VI
- Substituting Ohm's Law (V=IR): P=(IR)I=I2R
- Substituting I=V/R: P=V(V/R)=V2/R
- Conclusion: According to the options provided, the power dissipated is I2R.
This easy difficulty physics question is from the chapter current electricity, covering the topic of electric power. It appeared in the 2025 exam.
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