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```
If frequency of EMF in an ac circuit is n then Power varies with frequency 2n.. how??

```
2 years ago

Arun
24742 Points
```							The average power in AC circuit is given by Pavg = VI cos φ where V = vo sin wt I =  io sin wt   Therefore,P = vo  io  sin2 wt cosφP = vo  io  sin2 (2 π f t) cosφ  ... as w = 2πfNow substituting the value of  frequency f=n as given,the relationship changes toP = vo  io  sin2 (2 π n t) cosφ
```
2 years ago
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### Course Features

• 31 Video Lectures
• Revision Notes
• Test paper with Video Solution
• Mind Map
• Study Planner
• NCERT Solutions
• Discussion Forum
• Previous Year Exam Questions