December 2012
Beginner
528 pages
17h 31m
English
Content preview from Introduction to Electrical Power and Power Electronics
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18 Introduction to Electrical Power and Power Electronics
Example 1.5
A one-loop circuit has source voltage of 120 V and load impedance of 10∠+84.3º
Ω. Determine the current and average power delivered to the load. Can you guess
about the nature of the load—could it be a heater, capacitor, motor, etc.?
Solution:
The 120 V with no angle stated implies that it is the reference phasor at 0º. It is
also implied in power engineering that it is the rms value. The current phasor in
this loop will then be
I
V
Z
loop
loop
loop
==
∠
∠
=
∠
120 0
10 84 3
120
10
°
°.
00843 12 84 3°°
°A
−=∠
..
–
.
The 12 A is the rms value since we used 120 V
rms
to derive the current, whic ...
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