EEE-167 (IPE)
Basic Electrical and Electronic Circuits
AC Power Analysis
Course Instructor: Shahed Ahmed
Lecturer, Department of EEE, BUET
Instantaneous Power
Instantaneous power is the power at any instant of time. Unit : Watts
Instantaneous Power
Part-1 : time independent
Part-2 : time dependent
Average Power
Average power is the average of the instantaneous power over one period
T. Unit : Watts
Average Power calculation from phasors
Considering phasor voltage & current:
We recognize the following relationship:
Average Power calculation for special cases
Case-1:
What type of circuit element does this imply?
Case-2:
What type of circuit element does this imply?
Exercise Problems
1)
A current
flows through an impedance
average power delivered to the impedance.
2)
Find the average power supplied by the source and the same absorbed by the
resistor.
. Find the
Maximum Average Power Transfer
Maximum Average Power Transfer
Maximum Average Power Transfer
After performing optimization:
Exercise Problem
Determine the value of 𝑍𝐿 that maximizes the power drawn from the
source. Also find the maximum power.