Lessons in practical electricity; principles, experiments, and arithmetical problems, an elementary text-book . 309.—Students Experimental Dynamoand Fig. 310.—Graphical Representation of anAlternating Current. sen ting intervals of time. The vertical line, AM, at rightangles to it is divided into distances representing units ofcurrent, the current being in a positive direction when indi-cated above PK, and negative, when below PK. When the DYNAMO ELECTRIC MACHINES. 341 switch is closed the current immediately rises to its fullstrength of 5 amperes, or from P to A, and 5 amperes aremain
Lessons in practical electricity; principles, experiments, and arithmetical problems, an elementary text-book . 309.—Students Experimental Dynamoand Fig. 310.—Graphical Representation of anAlternating Current. sen ting intervals of time. The vertical line, AM, at rightangles to it is divided into distances representing units ofcurrent, the current being in a positive direction when indi-cated above PK, and negative, when below PK. When the DYNAMO ELECTRIC MACHINES. 341 switch is closed the current immediately rises to its fullstrength of 5 amperes, or from P to A, and 5 amperes aremaintained constant in a positive direction for one second,A to B. When point B is reached at the end of the firstsecond the current falls abruptly to zero, B to C, and rises to5 amperes in a negative direction, and is maintained for anequal interval of time, D to E, when it again falls to zero, atF, and repeats the same cycle of events in equal intervalsof time. The linePABCDEFGHK iscalled the current Fig. 310 the cur-rent is depicted asbeing of constantstrength during eachsecond, while it wasshown in ^ 291 and320 that during rota-tion of the
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Keywords: ., bookcentury1900, bookdecade1900, bookpublishernewyo, bookyear1901
