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530 ⏐⏐⏐ SINUSOIDAL ALTERNATING WAVEFORMS<br />

(a)<br />

(b)<br />

(c)<br />

(d)<br />

(e)<br />

(f)<br />

(g)<br />

(h)<br />

α = 225°<br />

α = 270°<br />

α = 315°<br />

α = 0°<br />

α = 45°<br />

α = 90°<br />

α = 135°<br />

α = 180°<br />

0°<br />

0°<br />

0°<br />

0°<br />

0°<br />

0°<br />

0°<br />

0°<br />

45°<br />

90°<br />

45° 90° 135°<br />

Note equality<br />

180°<br />

Sine wave<br />

α = 360°<br />

(i)<br />

225° 270° 315° 360°<br />

0° 45° 90° 135° 180°<br />

T (period)<br />

225°<br />

270°<br />

315°<br />

FIG. 13.16<br />

Generating a sinusoidal waveform through the vertical projection of a<br />

rotating vector.<br />

α<br />

α<br />

α<br />

α<br />

α<br />

α<br />

α<br />

α<br />

α

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