. Journal of electricity, power, and gas . a sine wave of and current at unity power fac-tor. In Fig. 6 is shown the same current and with a power factor of 50 per cent instead of instantaneous value of the pxswer flowing in any. Fig 6. circuit is equal to the product of the instantaneous\alue of the , and the instantaneous values ofthe current. The curve P represents these instantaneous valuesof the power. It will be noted that in the case ofunity ])ower factor (Fig. 5), the curve P is entirelyabove the , that is the line of zero value ; this indi-cates tha
. Journal of electricity, power, and gas . a sine wave of and current at unity power fac-tor. In Fig. 6 is shown the same current and with a power factor of 50 per cent instead of instantaneous value of the pxswer flowing in any. Fig 6. circuit is equal to the product of the instantaneous\alue of the , and the instantaneous values ofthe current. The curve P represents these instantaneous valuesof the power. It will be noted that in the case ofunity ])ower factor (Fig. 5), the curve P is entirelyabove the , that is the line of zero value ; this indi-cates that the power is all flowing in one direction. Itwill also be noted that the niaximtim value of the e. m. f. occurs at the same instant as the , which condition gi\es the maximum value ofthe povyer for these values of the current and , as can be seen from the figure. Referring to Fig. 6, it will be noted that for apower factor of 50 per cent, part of the curve, P, vsbelow the axis, which indicates that the power is notall flowing in the same direction, but that during apart of the cycle a portion of the power is actuallybeing pumped back into the circuit. The net valueof the power supplied is equal to the difiference be-tween
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Keywords: ., bookcentury1800, bookdecade1890, bookidjo, booksubjectelectricity
