Calculating Apparent Power, Average Power, and Power Factor in AC Circuits

AI Thread Summary
To calculate apparent power (S), average power (P), and power factor (PF) in AC circuits, one must first determine the circuit's impedance, which includes both inductive and capacitive components. The formulas for S and P are S = 1/2 Vm Im and P = 1/2 Vm I am Cos(φ), respectively. The correct results for the example provided are 676 VA at an angle of 58.16 degrees, with a power factor of 52% and an average power of 357 watts. It's essential to show previous attempts to identify errors in calculations. Accurate calculations require a clear understanding of the circuit parameters and their relationships.
mohamen
Messages
8
Reaction score
0
ac impedance ...find power

this is the circuit...attached...i have to find appartent power ( S) , Average Power (P) and power factor (p)...i have tried this question a lot times but every time i get incorrect result ...please solve this question...

Thanks
 

Attachments

Engineering news on Phys.org
please reply...
 
Please show us what you have tried.

What are the definitions of the quantities you need to find?
 
u just have 2 find the apparent power and average power ...u have been given a circuit having L & C...first u have to find its impedances then find the S and P...the formula for S is S=1/2 Vm Im...and for P=1/2 Vm I am Cos (phi)...thats it...i have tried by this but i didnt get the correct answer...
 
You need to show us what you have tried, that way we can help you find your errors.
 
Your naswers should be 676VA at an angle of 58.16 degrees. PF=52%, Power = 357 watts. Now, what have you done so far?

Hope this helps.
 

Thread 'How might electronics be different if AC voltage was 72V at 45 Hz?'

Hey guys. I have a question related to electricity and alternating current. Say an alien fictional society developed electricity, and settled on a standard like 73V AC current at 46 Hz. How would appliances be designed, and what impact would the lower frequency and voltage have on transformers, wiring, TVs, computers, LEDs, motors, and heating, assuming the laws of physics and technology are the same as on Earth?
View full post »

Thread 'Why does the amperage go real high if there is a low voltage short?'

I used to be an HVAC technician. One time I had a service call in which there was no power to the thermostat. The thermostat did not have power because the fuse in the air handler was blown. The fuse in the air handler was blown because there was a low voltage short. The rubber coating on one of the thermostat wires was chewed off by a rodent. The exposed metal in the thermostat wire was touching the metal cabinet of the air handler. This was a low voltage short. This low voltage...
View full post »

Thread 'What happens if shielded cable has a short to the shield?'

While I was rolling out a shielded cable, a though came to my mind - what happens to the current flow in the cable if there came a short between the wire and the shield in both ends of the cable? For simplicity, lets assume a 1-wire copper wire wrapped in an aluminum shield. The wire and the shield has the same cross section area. There are insulating material between them, and in both ends there is a short between them. My first thought, the total resistance of the cable would be reduced...
View full post »

Similar threads

Reducing AC inrush current in this setup
Replies
15
Views
3K
Power factor of a retrofitted LED unit in a fluorescent fitting
Replies
8
Views
2K
Maximum power from a transformer
Replies
8
Views
3K
AC Drift Velocity: Understand Reactive Power & Movement of Electrons
Replies
11
Views
2K
Sizing an Isolation Transformer for a DC Power Supply
Replies
8
Views
2K
Alternator torque when connected to a phase-shifted AC source
Replies
3
Views
2K
How transmission lines deliver (established?) power from generator
Replies
8
Views
2K
Could you use Solar to power a DC to AC Inverter? (Description below)
Replies
6
Views
3K
Query about the time average of an AC power supply
Replies
2
Views
2K
Resistive heating power AC vs rectified AC/DC
Replies
10
Views
4K

Hot Threads

Recent Insights

Back
Top