April 2016
Intermediate to advanced
384 pages
12h 56m
English
Content preview from Newnes Circuit Calculations Pocket Book
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226 Circuit calculations pocket book
= 1.712 799.27°
9
2+ j9 = V(2
2
+ 9
2
) tan"
1
- = 9.22 777.47°
5 - j2 = V[5
2
+
(-2)
2
]
tan"
1
— = 5.38 7-21.80°
Note
9.22 ,
— 777.47° - (-21.80°) = 1.712 799.27°
5.38
12.6 Further addition
Example 19 Derive an expression for the sum of the two waves
80 sin 2ir/r
85 sin
^2ir/f-
~j
There are three methods for solving a problem of this kind.
Method 1. By drawing.
Figure 12.10 shows the phasor diagram where OA and OB repre-
sent the maximum values to scale. OB lags OA by
TT/4
radians (45°).
Completing the parallelogram OABC gives the resultant OC.
Figure
12.10
By measurement OC = 152
By measurement 6 = -23.2° (-0.40 ...
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