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MOTION PICTURE PROJECTION 41
under suitable conditions, deposits silver at the rate of .001118 gram per second.
The volt is equal to the E. M. F. which, when applied to a conductor having a resistance of one ohm, will produce in it a current of one ampere.
All substances resist the passage of electricity, but the resistance offered by some is very much greater than that offered by others. Metals have by far the least resistance, and of these, silver possesses the least of any. In other words, silver is the best conductor. If the temperature remains the same, the resistance of a conductor is not affected by the current passing through it. A current of ten, twenty or any number of amperes may pass through a circuit, but its resistance will be unchanged with constant temperature. Resistance is affected by the temperature and also by the degree of hardness. Annealing decreases the resistance of a metal.
Conductance is the inverse of resistance; that is, if a conductor has a resistance of R ohms, its
1 conductance is equal to — .
R
Resistance Proportional to Length. — The resistance of a conductor is directly proportional to its length. Hence, if the length of a conductor is doubled, the resistance is doubled, or if the length is divided, say into three equal parts, then the resistance of each part is one-third the total resistance.
Resistance Inversely Proportional to CrossSection. — The resistance of a conductor is inversely proportional to its cross-sectional area. Hence the greater the cross-section of a wire the