Quarter turn completed Conductors cutting directly across the magnetic field as conductor  A passes across the north magnetic pole and B passes across the  S pole. S B A 0° 90° 180° 270° Maximum positive voltage 360° N S A B C 1 C 2 0° 90° 180° 270° Zero voltage Rotating conductors moving parallel to magnetic field,  cutting minimum lines of force. 360° Magnetic field  Three quarters turn completed Conductors again moving directly across magnetic field A passes across south magnetic pole and B across N magnetic pole. S 0° 90° 180° 270° Maximum negative voltage 360° N S B A 0° 90° 180° 270° Voltage drops to zero  One half turn completed Conductor again moving parallel to magnetic field, cutting minimum lines of force. 360° N S A 0° 90° 180° 270° Zero voltage Full turn completed Conductor A has made one complete cycle and is in same position as in position A. The generator has generated one complete cycle  of alternating voltage or current. 360° Position 1 Position 2 Position 3 Position 5 Position 4 C 1 C 2 N C 1 C 2 C 1 C 2 B A N C 1 C 2 B Figure 9-11.  Generation of a sine wave.  values of the voltages generated. The horizontal baseline is  divided into degrees, or time, and the vertical distance above  or below the baseline represents the value of voltage at each  particular point in the rotation of the loop. The specific operating principles of both alternators and  generators as they apply to aircraft is presented later in  this text.  9-8