Exercises in Electrical Engineering for the Use of Second Year Students in Uni
Exercises in Electrical Engineering for the Use of Second Year Students in Uni
Thomas Mather
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How does the current vary when the carbons are slowly separated and the outside resistance slowly varied so as to keep the P. D. Constant ? Explain the cause of the results obtained. 6. Mrs. Ayrton found that for solid carbons the power ex- pended in the arc was a linear function of the current when the length was kept constant, and also a linear function of the length when the current was kept constant. Prove from these facts that the P. D. Across the arc is represented by the following formul...a ' . . where a, ,/, and g are constants. 7. Draw a polar curve showing approximately the dis- tribution in a vertical plane of the light given out by an arc lamp of the open type. Show also a construction by which the mean spherical candle-power of such a source can be de- termined. Give proof. 8. If the polar curve of an arc be rotated about a vertical axis, it will describe a solid of revolution. It has been suggested that the radius of a sphere of equal volume would be the mean spherical candle-power.
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