An elementary book on electricity and magnetism and their applications . Fig. 217. Curves of and current both be drawn on the same horizontal base line. Figure 217shows an and also a curve of current in phase. It willbe noticed that the current and voltage are both at zero at the same instant, both passthrough their values at the same in- 360° w_^ stant, and in fact keep instep throughout theirentire cycles. This is thecondition of an alternat-ing-current circuit whichcontains resistance shall see that in alternating-current circuits we very ofte
An elementary book on electricity and magnetism and their applications . Fig. 217. Curves of and current both be drawn on the same horizontal base line. Figure 217shows an and also a curve of current in phase. It willbe noticed that the current and voltage are both at zero at the same instant, both passthrough their values at the same in- 360° w_^ stant, and in fact keep instep throughout theirentire cycles. This is thecondition of an alternat-ing-current circuit whichcontains resistance shall see that in alternating-current circuits we very oftenhave to consider other factors besides resistance, such as induc-tance and capacity, which may cause the current to lag be-hind the voltage (Fig. y~P\ ^voltage218) or even to leadthe voltage (Fig. 219).The discussion of thecauses and effects oflagging and leading cur-rents will be the subject Of the next chapter. Fig. 219. — Current leading by 30°. Fig. 218. — Current lagging 50° behind
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectmagnetism, bookyear19
