## Electrical Measurements |

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adjusted alternating currents alternating-current ammeter ampere apparatus armature arrangement axis balance battery bridge Bureau of Standards cable calibration capacity cell cent charged commutator condenser conductors connected constant copper current coils curve cycles deflection detector determined device diameter dielectric direct current direct-current disc discharge displacement dynamometer effect Electrical Engineers electrodynamometer electrometer electrostatic employed equal equation error fixed coil flux frequency galvanometer gives harmonic increase indicated instrument insulation length load loop magnetic maximum measured ment method movable coil movable system mutual inductance necessary needle non-inductive obtained ohms oscillograph phase angle plate pointer position potential circuit potential coil potential difference potentiometer power factor proportional ratio reading resistance rheostat scale secondary sensitivity short-circuited shown in Fig shunt sinusoidal slide wire stray fields terminals tion torque tube voltage voltmeter volts watt-hour meter wattmeter watts wave form Wheatstone bridge zero

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Page 705 - As a unit of resistance, the international ohm, which is based upon the ohm equal to 10" units of resistance of the CGS system of electromagnetic units, and is represented by the resistance offered to an unvarying electric current by a column of mercury at the temperature of melting ice, 14.4521 grams in mass, of a constant cross-sectional area and of the length of 106.3 centimetres.

Page 705 - As a unit of quantity, the international coulomb, which is the quantity of electricity transferred by a current of one international ampere in one second. As a unit of capacity, the international farad, which is the capacity of a condenser charged to a potential of one international volt by one international coulomb of electricity.

Page 705 - The unit of current shall be what Is known as the international ampere, which is one-tenth of the unit of current of the centimeter-gram-second system of electro-magnetic units, and is the practical equivalent of the unvarying current, which, when passed through a solution of nitrate of silver in water in accordance with standard specifications, deposits silver at the rate of one thousand one hundred and eighteen milllonths of a gram per second.

Page 705 - First. The unit of resistance shall be what is known as the international ohm, which is substantially equal to one thousand million units of resistance of the centimeter-gram-second system of electro-magnetic units, and is represented by the resistance offered to an unvarying electric current by a column of mercury at the temperature of melting ice fourteen and four thousand five hundred...

Page 705 - ... As a unit of electromotive force, the international volt, which is the electromotive force that, steadily applied to a conductor whose resistance is one international ohm, will produce a current of one international ampere, and which is represented sufficiently well for practical use by...

Page 705 - ... of a gram per second. Volt. — As a unit of electromotive force, the international volt, which is the electromotive force that, steadily applied to a conductor whose resistance is...

Page 706 - That it shall be the duty of the National Academy of Sciences to prescribe and publish, as soon as possible after the passage of this act, such specifications of details as shall be necessary for the practical application of the definitions of the ampere and volt hereinbefore given, and such specifications shall be the standard specifications herein mentioned.

Page 512 - Diversity factor is the ratio of the sum of the maximum power demands of the subdivisions of any system or parts of a system to the maximum demand of the whole system or of the part of the system under consideration, measured at the point of supply. Connected Load. — The combined continuous rating of all the receiving apparatus on consumers...

Page 706 - Henry, which is the induction in a circuit when the electro-motive force induced in this circuit is one international volt, while the inducing current varies at the rate of one ampere per second.