Power Dissipation
Easyphysics
A 5 Ω resistor carries a current of 4 A. What is the power dissipated in the resistor?
Select the correct option:
Solution
Incorrect! Answer:
80 W
- Joule Heating Concept: When current passes through a resistor, electrical energy is converted into heat (thermal energy).
- Power Formulas: P=VI, P=I2R, or P=V2/R.
- Calculation (using I and R):
- P=(4 A)2×5 Ω
- P=16×5=80 Watts.
- Conclusion: The resistor dissipates 80 Joules of energy per second as heat.
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About This Question
- Subject
- physics
- Chapter
- current electricity
- Topic
- power dissipation
- Difficulty
- Easy
- Year
- 2025
Solution
Correct Answer:
80 W
- Joule Heating Concept: When current passes through a resistor, electrical energy is converted into heat (thermal energy).
- Power Formulas: P=VI, P=I2R, or P=V2/R.
- Calculation (using I and R):
- P=(4 A)2×5 Ω
- P=16×5=80 Watts.
- Conclusion: The resistor dissipates 80 Joules of energy per second as heat.
This easy difficulty physics question is from the chapter current electricity, covering the topic of power dissipation. It appeared in the 2025 exam.
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