Average Power Ac
Average power in AC circuit with Vrms, Irms and phase angle φ is:
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About This Question
- Subject
- physics
- Chapter
- electromagnetic induction and ac
- Topic
- average power ac
- Difficulty
- Medium
- Year
- 2025
Solution
Correct Answer:
Vrms Irms cosφ
In an AC circuit where voltage and current have a phase difference ϕ, the instantaneous power fluctuates. The average power consumed is: Pavg=VrmsIrmscosϕ
- The term cosϕ is called the Power Factor.
- For a pure resistor, ϕ=0∘⟹cosϕ=1 (maximum power).
- For a pure inductor or capacitor, ϕ=90∘⟹cosϕ=0 (no power consumed, wattless current).
This medium difficulty physics question is from the chapter electromagnetic induction and ac, covering the topic of average power ac. It appeared in the 2025 exam.
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