By Edwin James Houston
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Extra resources for Alternating Electric Currents
This influence actance of the coil. called the re- is The nature of react- ance will be understood from a consideration of the following principles: an electric current is sent When through a con- ductor, the conductor thereby acquires all the properties of a magnet, as was first ELECTROMOTIVE FO&CES. shown by Oersted, see the actual in state 1819. of it is believed that - Could things exists in the neighborhood of conductor, 31 we which an active we would be able to see around the conductor, a streaming motion in concentric circular paths, of the highly tenuous, all -per- vading medium, called the ether.
M. F. oppo- sitely directed to that of the E. The induced M. F. quently, called a E. M. F. counter impressed is, electromotive produced by inducsometimes called the counter force; and, since it is tion, it is conse- electromotive force of self-induction. ELECTROMOTIVE FORCES. The intensity of the counter E. 35 M. F. so depends upon the rate of change in| the amount of flux passing through the set up, loop at any moment, and not on the total amount of flux. Consequently, when the direction of current is reversed, as in an alternating -current circuit, the direction of the flux is reversed, occurs in the rate at and a rapid change which the flux is passing through the loop.
The ether streaming motion is called magnetism. It is most energetic in the immediate neighborhood of the conductor, gradually becoming weaker at greater distances from Moreover, the direction of the streaming depends upon the direction of the current in the conductor. For exit. the current passes downward"~through the plane of the paper, that is, from the observer, the direc- ample, if, as in Fig. 9, tion of the streamings will be the same as the direction of the hands of a watch. ALTERNATING ELECTRIC CURRENTS.