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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