. A text-book of electrical engineering;. ^tN. From equation (152) we get for the effective value ==^v B 2v— - ^ 3 3i3^ r2= 07455, and, substituting the value of e found above, E = 10-8 = 10-8. The effective alternating is therefore, in our example, 0745 ofthe between the brushes, or the pressure is 1-34 times the This constant ratio of the pressures is very important. If we wishto convert high-pressure alternating current into low-pressure direct cur-rent, we must first transform the high-pressure alternating current toalternating curre

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. A text-book of electrical engineering;. ^tN. From equation (152) we get for the effective value ==^v B 2v— - ^ 3 3i3^ r2= 07455, and, substituting the value of e found above, E = 10-8 = 10-8. The effective alternating is therefore, in our example, 0745 ofthe between the brushes, or the pressure is 1-34 times the This constant ratio of the pressures is very important. If we wishto convert high-pressure alternating current into low-pressure direct cur-rent, we must first transform the high-pressure alternating current toalternating current of a pressure equal to 0745 of the required is done by means of ordinary static transformers. Commutation diffi-culties hmit the pressure to about 1000 volts, generally speaking, andhigh pressures are not suitable for lighting purposes, except in exceptionalcases. An alternative to the use of static transformers and rotary converters 95• The Alternating of a Closed Winding 305 is the employment of mo

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