By Edwin James Houston
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Extra resources for Alternating Electric Currents
M. F. or a current at either its greatest or its least value nor ; is usual to take the average value. F. and the current, called respectively the effective E. M. F. and the effective current strength, s\xe taken as estimated from their equivalent heating effects. Thus, an alternating- current pressure of 100 volts one which, as already mentioned, will produce in an incandescent lamp the same is heating and, 'therefore, the same degree of illumination as 100 volts of continuouscurrent pressure.
12. 13 shows other forms of theatre dimmer, which operate by the choking effect of reactis ALTERNATING ELECTRIC CURRENTS. 44 ive coils furnished with a movable core consisting of a bundle of soft iron wires. ^ FIG. 13 ALTERNATING CURRENT THEATRE DIMMERS. Both continuous and alternating currents are capable, when passed through ELECTROMOTIVE FORCES. 45 wire provided with iron cores, of producing electromagnets as shown in Fig. 14. Continuous -electric coils of insulated currents are generally employed for this purpose, since the magnetizing coils do not then act to throttle the current.
Is opposite to the M. F. which was re- direction of the E. quired to produce the flux that caused it. In order to distinguish the E. M. F. pro- ducing the flux, from the E. M. F. produced by the flux, the former is called the M F In other words, the impressed E. passage of magnetic flux through a con. ducting loop, consequent upon the application of an E. M. F. to such loop, will tend to set up in the loop an E. M. F. oppo- sitely directed to that of the E. The induced M. F. quently, called a E.