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Philadelphia: Million Dollar Pojv'bance Oreheatra: Silver
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acteristlcs in an electfloal circuit
That relationship is expressed b> the
formula E equals I times K.
The values of the units were arrived
at in a very logical way.
A volt, the unit of electrical pres
s,.re is that pressure which, when
applied to a circuit whose resistance
is one ohm, produces a current flow
of one ampere.
Similarly an ampere is the rate or
flow of electricity produced in a cir
cuit whose resißtance is one ohm by
an electromotive force of ope volt.
Stated in other words, an ohm is
the resistance of a circuit in which
an applied electromotive force of one
volt will produce a current of one
ampere.
The energv spent per second in any
part of the circuit by which electri
cal current is charged to heat or
mechanical work is figured in watts.
A watt is obtained by multiplying the
rate of current flow between any two
points or in an entire circuit by the
drop in potential between the points
in question. The abbreviation and
svmbol for watts is a small “w.”
This article on electrical units will
be concluded tomorrow.
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