Principles of Electrical Measurements |
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Common terms and phrases
abscissæ adjusted alternating current ammeter amount ampere arrangement Article available E.M.F. balance point ballistic galvanometer battery bridge wire C.G.S. unit calibration capacity centimeter charge closed computed condenser conductor connected constant correction corresponding current flows curve damping denotes determined difference of potential direction discharged effect electric current electrodynamometer electromotive force equal equation error expressed fall of potential farad figure of merit galvanom galvanometer circuit gives high resistance instrument internal resistance iron joined in series length low resistance magnetic field magnetic flux means measure the fall meter method movable coil mutual inductance necessary needle Ohm's law ohms parallel passed position potential difference potentiometer power expended quantity of electricity ratio resistance box reversed rheostat scale secondary shown in Fig shunt slide wire bridge standard cell swing tion total resistance vanometer varying volt voltmeter reading wattmeter Wheatstone bridge
Popular passages
Page 8 - 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 9 - 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...
Page 8 - Ampere, which is one-tenth of the unit of current of the CGS system of electromagnetic units and which is represented sufficiently well for practical use by the unvarying current which, when passed through a solution of nitrate of silver in water, in accordance with a certain specification, deposits silver at the rate of 0.001118 of a gramme per second.
Page 8 - A system of units based on the centimeter as the unit of length, the gram as the unit of mass, and the second as the unit of time.
Page 34 - 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 129 - ... to the contact piece C. A resistance S is connected in series with the battery B in order to reduce the potential difference across P to any desired amount. The determination is made as follows : Before testing the cell D a standard cell of known EMF is first inserted in its place, and C adjusted until there is no deflection of the galvanometer upon closing the key. The cell is connected so that its EMF opposes that of the battery ; therefore, when no current flows through the galvanometer, the...
Page 8 - ... as the unit of mass, and the second as the unit of time. These fundamental units are (1) the Ohm, the unit of electric resistance which has the value of 1,000,000,000...
Page 204 - Maxwell's Method. — In this method the self inductance to be measured is placed in one arm of a Wheatstone bridge, the other arms of which should be as free from inductance as possible. By closing the keys in the usual order the bridge can be balanced for steady currents giving the relation PS = QR (1) FIG.
Page 8 - II. As a system of units representing the above and sufficiently near to them to be adopted for the purpose of electrical measurements and as a basis for legislation...
Page 8 - The International Ampere is the unvarying electric current which, when passed through a solution of nitrate of silver in water, in accordance with the specification II, attached1 to these resolutions, deposits silver at the rate of 0.00111800 of a gram per second.