## amperes

Noun

- plural form of
*ampere*

- Thus the centi-ampere balance ranges from i to ioo centi-
**amperes**, the deci-ampere balance from i to ioo deci-**amperes**, the ampere balance from i to ioo**amperes**, the deka-ampere balance from i to ioo**amperes**, the hecto-ampere balance from 6 to 600**amperes**, and the kilo-ampere balance from ioo to 2500**amperes**. - A third platinum coil, wound non-inductively between the primary and the secondary, served to carry the current by which the ring was heated; a current of 4.6
**amperes**, with 16 volts across the terminals, was found sufficient to maintain the ring at a temperature of 11 50° C. In the ring itself was embedded a platinum-thermometer wire, from the resistance of which the temperature was determined. - At first the current is 3000
**amperes**at 220 volts, increasing to 9000**amperes**at 20 volts after 20 hours. - If then the amperemeter scale reading was 100 it would show an error of that scale reading of minus 1.9
**amperes**or nearly 2%. - The principle on which the instrument works is as follows: Suppose any circuit, such as an electric motor, lamp or transformer, is receiving electric current; then the power given to that circuit reckoned in watts is measured by the product of the current flowing through the circuit in
**amperes**and the potential difference of the ends of that circuit in volts, multiplied by a certain factor called the power factor in those cases in which the circuit is inductive and the current alternating.

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