. Electricity simplified. The practice and theory of electricity ... lt; of a. Circuit Fig. 4.—Diagram of Fall of Potential. But suppose that the line for equal lengths variesin resistance. Thus, assume that one-tenth the re-sistance is included in the first quarter, or 250 feet;then that 250 feet of fine wire are in the line, repre-senting one-half the total resistance; then that thenext 250 feet represents one-quarter of the total re-sistance; while the remaining resistance, or fifteenone-hundredths, is in the next and last section of 250feet. Ohms law tells us that the fall in pot
. Electricity simplified. The practice and theory of electricity ... lt; of a. Circuit Fig. 4.—Diagram of Fall of Potential. But suppose that the line for equal lengths variesin resistance. Thus, assume that one-tenth the re-sistance is included in the first quarter, or 250 feet;then that 250 feet of fine wire are in the line, repre-senting one-half the total resistance; then that thenext 250 feet represents one-quarter of the total re-sistance; while the remaining resistance, or fifteenone-hundredths, is in the next and last section of 250feet. Ohms law tells us that the fall in potentialvaries with the resistance. Hence our diagram mustshow for the four parts of our line of 1,000 feet afall proportional to the resistance of each section. 48 ELECTRICITY SIMPLIFIED. The diagram produced in this way is given angle of inclination of the separate lines indi-cates the fall of potential or electromotive force ex-pended on each section. This gives a pictorial representation of the condi-tions obtaining in a circuit of varying Fig. 5.—Diagram of Fall of Potential in Different Parts of Circuit. We might go a step further and graduate thethickness of the inclined line to represent the resist-ance. As resistance is in opposition to the current,the line should he made thin for high and thick forlow resistance, as in the next cut. The reciprocal of a number is the quotient ob-tained by dividing 1 by the number in reciprocal of resistance is conductance. Hence,what was expressed in an indirect manner at the endof the last paragraph may be expressed directly interms of conductance. The thickness of sections ofthe line may represent the conductance. This inthe above case would give such a diagram as is givenon the next page. VELOCITY OF ELECTRICITY. 49 This diagram, which tells at a glance the wholestory of the circuit, presents the analogy to a waterconduit. The larger pipes manifestly require lesshead of water to convey the flow,
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Keywords: ., bookcentury1800, bookdecade1890, bookidel, booksubjectelectricity
