Laboratory exercises to accompany Carhart and Chute's First principles of physics . ve force be induced ? Uponwhat does the direction of an induced electromotive forcedepend ? Upon what does the amount of the inducedelectromotive force depend ? EXPERIMENT 90 Study of a Dynamo OBJECT. To observe the generation of current in a simpledynamo and to study the construction of a direct current dynamo. Apparatus. Large U-shaped magnet, mounted with its polesvertical; coil of fine wire wound on a wooden or an iron core, tobe revolved between the magnet poles ; sensitive galvanometer;two-pole, drum-woun
Laboratory exercises to accompany Carhart and Chute's First principles of physics . ve force be induced ? Uponwhat does the direction of an induced electromotive forcedepend ? Upon what does the amount of the inducedelectromotive force depend ? EXPERIMENT 90 Study of a Dynamo OBJECT. To observe the generation of current in a simpledynamo and to study the construction of a direct current dynamo. Apparatus. Large U-shaped magnet, mounted with its polesvertical; coil of fine wire wound on a wooden or an iron core, tobe revolved between the magnet poles ; sensitive galvanometer;two-pole, drum-wound small dynamo (6-8 volts); voltmeter;dry or storage cell, or other source of current for exciting thefield of the dynamo. Introductory: Voltaic cells are not adapted to produce high pressuresand large currents. Hence dynamos are employed incommercial work. Their action depends upon the factthat when a conductor cuts across magnetic lines of force,a difference of potential is produced in the electromagnet which produced the lines of force in a STUDY OP A DYNAMO 305. dynamo is called the field magnet. The conductors whichcut the lines are wires wound about a soft iron core. Thewires and core together constitute the armature. Thecurrent generated in the armature is led out into theexternal circuit by means of brushes, which make a slidingcontact with bars connected to the ends of the armaturecoils. These bars may be so placed and connected thatthe brushes change their contactfrom one bar to the next at justthe instant when the difference ofpotential changes directi on. Thebars then constitute the commu-tator. We shall first observe thegeneration of voltage in a simpledynamo and then examine a ma-chine of commercial type to locatethe parts just described. Experimental: (a) Connect the long, flexibleleads of the armature coil fur-nished you with the galvanom-eter (Fig. 115). Hold the arm-ature between the poles of the coilin a vertical position. Turn thecoil sharply t
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectphysics, bookyear1913
