. Hawkins electrical guide. Questions, answers & illustrations; a progressive course of study for engineers, electricians, students and those desiring to acquire a working knowledge of electricity and its applications; a practical treatise. Fig. 1,221.—Diagram showing one alternation of the current in which the latter varies from zeroto maximum and back to zero while the generating loop ABCD makes one half revolution. Ques. What is the amplitude of the current? Ans. The greatest value of the current strength attainedduring the cycle. The foregoing definitions are also illustrated in fig. 1,218
. Hawkins electrical guide. Questions, answers & illustrations; a progressive course of study for engineers, electricians, students and those desiring to acquire a working knowledge of electricity and its applications; a practical treatise. Fig. 1,221.—Diagram showing one alternation of the current in which the latter varies from zeroto maximum and back to zero while the generating loop ABCD makes one half revolution. Ques. What is the amplitude of the current? Ans. The greatest value of the current strength attainedduring the cycle. The foregoing definitions are also illustrated in fig. 1,218. 360. Fig. 1,222.—Diagram illustrating amplitude of the current. The current reaches its amplitudeor maximum value in one quarter period from its point of zero value, as, for instance, whilethe generating loop moves from position ABCD to ABCD. At three-quarter revo-lution, the current reaches its maximum value in the opposite direction. 1.(11)1 II AW A / NS ELECTRIC ITY Ques. Define the term period. Ans. This is the time of one cycle of the alternating current. Ques. What is periodicity? Ans. A term sometimes used for frequency. Frequency.—If a slowly varying alternating current 1 >e i >a through an incandescent lamp, the filament will be seen to varyin brightness, following the change of current strength. If, »50 REVOLUTIONSPER MINUTE 150x4*6, 900 REVOLUTIONSPER MINUTE
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