Capacity
المؤلف:
GEORGE A. HOADLEY
المصدر:
ESSENTIALS OF PHYSICS
الجزء والصفحة:
p-327
2025-11-29
25
If two insulated conductors, of the same shape but of different sizes, are charged to the same potential, it will be found that the larger one has a greater charge than the other. This means that there is a difference in their electrical capacity. The capacity of a conductor is the ratio of its quantity of charge to its potential; that is,
in which C = capacity, Q = number of units of electrification, and V = number of units of potential. ....[Formula 1]
The word capacity as used in electricity has a meaning different from that usually given to it. We say that the capacity of a gallon jug is 4 quarts, meaning when it is full. From Formula 1, we see that the capacity of a conductor is equal numerically to the quantity of electricity on it when its potential is 1 unit. The quantity that a gallon jug can hold is never greater than its capacity -4 quarts; but the number of units of charge that can be given to an insulated conductor may be many times its capacity, in which case its potential will be many times 1 unit. Since electricity in its static condition is on the outside of bodies, a wooden ball covered with metal foil has the same capacity as a solid metal ball of the same size.
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