. 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. ondition rarely found in practice. When the current is not in phase with the pressure, the productof volts and amperes as indicated by the voltmeter and ammetermust be multiplied by a coefficient called the power factor inorder to obtain the true -watts, or actual power available. There are several ways of denning the power factor, any ofwhich requires some
. 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. ondition rarely found in practice. When the current is not in phase with the pressure, the productof volts and amperes as indicated by the voltmeter and ammetermust be multiplied by a coefficient called the power factor inorder to obtain the true -watts, or actual power available. There are several ways of denning the power factor, any ofwhich requires some explanation. The power factor may bedenned as: The number of watts indicated by a wattmeter, dividedby the apparent watts, the latter being the watts as measuredby a voltmeter and ammeter. The power factor may be expressed as being equal totrue power true watts true watts apparent power apparent watts volts X amperes Ques. What are the true watts? Ans, The watts as, measured by a wattmeter. - HAWKIXS ELECTRICITY Que*. What are the apparent watts? The watts obtained by multiplying together the simul-taneous voltmeter and ammeter readings. Ques. What is usually meant by power factor? -mine how much of the power supplied is m—*—i i &mm ?:: : :4 :: -;■*. t-r:: :vt : : Vr :■-■odd :•* :-- A k ■«ai led ■ pnpt _-.* the :-:-i: • :- tkt i ■ ■.7 : -: -: ■ ■ :■_ v: fed <M*ol ir ficBbedi I ■ I i■r ■ •-•:.: c_ -• •. :- — .-. • ..gmm : •■• :I * ■Mdki --- :• : . :■ :- --. - —;■ - •. -. - < Ques. Upon what does the power factor depend?Ans. Upon the relative amounts of resistance inductance andcapacity contained in the circuit THE POWER FACTOR 1,103 Ques. How does the power factor vary in value? Ans. It varies from one to zero. The power factor, as will be shown later, is equal to the cosine of theangle of phase difference; its range then is from one to zero becausethese are the limiting values
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