Electricity Treated Experimentally, for the Use of Schools And Students
Electricity Treated Experimentally, for the Use of Schools And Students
Cumming, Linnaeus, 1843-
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135) BC, CD, DE, EF Digitized by LjOOQIC Chap. Ohm's Law. 219 represent on any scale the resistance in the previous figure (Fig 134), and setup at C, D, E, F, ordinates or perpendiculars Fio. 185. proportional to the observed potential diflFerences, the extremi- ties of these ordinates will be in a straight line, and that straight line may be taken as giving graphically the potential gradient in the conductor. The potential at any point may be found by simply drawing a perpendicular to meet the... gradient line from the corresponding part of the line of resistances. We may notice that this, in connection with the law of Ohm, gives us an independent proof of the constancy of the current in all parts of a circuit; the ratio between the potential difference and the resistance being the measure of the current strength. This measure is, in fact, the tangent of the angle at j5, or of the inclination of the potential gradient. When any amount of resistance is introduced between the terminals of the cell, the difference of potential becomes less than the total E.M.F.
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