Quotation from: General Science

Written by: Bertha M. Clark


313. How Current is Measured. The preceding Section has shown
clearly the danger of too strong a current, and the necessity for
limiting the current to that which the wire can safely carry. There
are times when it is desirable to know accurately the strength of a
current, not only in order to guard against an overload, but also in
order to determine in advance the mechanical and chemical effects
which will be produced by the current. For example, the strength of
the current determines the thickness of the coating of silver which
forms in a given time on a spoon placed in an electrolytic bath; if
the current is weak, a thin plating is made on the spoon; if the
current is strong, a thick plating is made. If, therefore, the exact
value of the current is known, the exact amount of silver which will
be deposited on the spoon in a given time can be definitely
calculated.

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