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Unformatted text preview: Sinusoidal waveform The sinusoidal waveform (sine wave) is the fundamental alternating current c) and alternating voltage waveform Sine waves (ac) and alternating voltage waveform. lectrical sine waves are named Electrical sine waves are named from the mathematical function with the same shape. Sine waves are characterized by the amplitude and period. The mplitude is the maximum value of a 10 V 15 V 20 V A amplitude is the maximum value of a voltage or current; the period is the time interval for one complete cycle. 0 V10 V15 V t ( s) μ 25 37.5 50.0 Lecture 6 Lecture 61 Electronics and Laboratory Electronics and Laboratory20 V T Period and frequency of a sine wave The period of a sine wave can be measured between any two corresponding points on the waveform. T T T T T T A requency ( is the number of cycles that a sine wave completes in one Frequency ( f ) is the number of cycles that a sine wave completes in one second. Frequency is measured in hertz (Hz). The period and frequency are reciprocals of each other. 1.0 s T f 1 = and f T 1 = Lecture 6 Lecture 62 Electronics and Laboratory Electronics and Laboratory Sinusoidal voltage sources – AC generator inusoidal voltages are produced by ac generators and electronic oscillators Sinusoidal voltages are produced by ac generators and electronic oscillators. When a conductor rotates in a constant magnetic eld, a sinusoidal wave is generated. field, a sinusoidal wave is generated. N S • Generators convert rotational energy to electrical energy. A stationary field rmature brushes alternator with a rotating armature is shown. The armature has an induced voltage, which is connected through slip slip rings armature rings and brushes to a load. N S C D A C D B C D C C D D B C D Motion of conductor Conductor A A A A hen the conductor is moving parallel with hen the loop is mo ing perpendic lar to the A Lecture 6 Lecture 63 Electronics and Laboratory Electronics and Laboratory When the conductor is moving parallel with the lines of flux, no voltage is induced. When the loop is moving perpendicular to the lines of flux, the maximum voltage is induced. Electronic signal generator Function generators unction selection Typical controls: Function selection Frequency ange utput level (amplitude) Range Adjust Outputs Output level (amplitude) DC offset CMOS output Duty cycle ine quare iangle Lecture 6 Lecture 64 Electronics and Laboratory Electronics and Laboratory Sine Square Triangle Sine wave voltage and current values...
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This note was uploaded on 07/08/2009 for the course KIM 01505 taught by Professor Dong during the Spring '09 term at Ewha Womans University.
 Spring '09
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