. 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. FlGS. to 1,357.—Mechanical analogy of wattless current. If a man lift a weight anydistance, as from the position of fig. 1,355 to position of fig. , he does a certainamount of work on the weight giving it potential energy. When he lowers it to itsoriginal position, as in fig. 1,357, the weight loses the potential energy previouslyacquired, that i
. 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. FlGS. to 1,357.—Mechanical analogy of wattless current. If a man lift a weight anydistance, as from the position of fig. 1,355 to position of fig. , he does a certainamount of work on the weight giving it potential energy. When he lowers it to itsoriginal position, as in fig. 1,357, the weight loses the potential energy previouslyacquired, that is, it is given back to the man, the system (man and weight) havingreturned to ics original condition as in fig. 1,355. During such a cycle, the work done bythe man on the weight is equal to the work done by the weight on the man and no usefulexternal work has. been accomplished. From (1) and (2) it is seen that the work done by the man on the weightis equal to the work done by the weight on the man, hence no useful workhas been accomplished; that is, the potential energy of the weight whichit originally possessed has not been increased. Why the Power Factor is equal to Cos<£,—-In the pre-ceding figures showing power curves f
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