St. John, Thomas M. (Thomas Matthew), b. 1865 · New York, T. M. St. John · leaf 111
rns of fine wire. The compound ztmind dynamois really a combination of the two methods just given.In separately-excited dynamos, the current from a sepa-rate machine is used to excite the field-magnets. 132. Various Machines. Fig. 145 shows a handpower dynamo which produces a current for… … CHAPTER XVIII. HOW THE ELECTRIC CtTERENT IS TRANSFORMED. 133. Electric Current and Work. The amount ofwork a current can do depends upon two factors; thestrength (amperes), and the pressure, or E. M. F. (volts).A current of 10 amperes with a pressure of 1,000 volts =10 X I 000 = 10,000 watts. This…
Electricity
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