. Elementary and dental radiography . Fig. i. Fig. 3. Fig. 2. Arrows A rei)resent the direction of flow ol electric current. Arrows B represent thedirection of flow of magtietic flux in the magnet. Fig. 3. Bar magnet with ))olarity indicated. urement of electromotive power, and the wattage of a current is obtainedby multiplying the volts by the amperes. Thus, if we had a current of oneampere under a pressure of one volt, one watt would be operative. When I,GOO watts are active for an hour—that is, when a current1,000 watts strong has been in motion, the current turned on. for onehour—the elect
. Elementary and dental radiography . Fig. i. Fig. 3. Fig. 2. Arrows A rei)resent the direction of flow ol electric current. Arrows B represent thedirection of flow of magtietic flux in the magnet. Fig. 3. Bar magnet with ))olarity indicated. urement of electromotive power, and the wattage of a current is obtainedby multiplying the volts by the amperes. Thus, if we had a current of oneampere under a pressure of one volt, one watt would be operative. When I,GOO watts are active for an hour—that is, when a current1,000 watts strong has been in motion, the current turned on. for onehour—the electrometer will register one kilowatt-hour. So bills for elec-tricity are made nut for so manv kiKnvatt-hours. Magnetism is a form of kinetic energy veryItladttCtiStn. closely related in its nature to electricity. Mag- netism produces electricit\, and vice versa. 6 ELEMENTARY RADIOGRAPHY The substance in which this energy, or property, magnetism, residesis called a magnet. If a bar of magnetized steel be dropped into iron filings, a
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