Electrical Measurements: A Laboratory Manual |
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Common terms and phrases
adjusted alternating current amalgam ammeter ampere ance angle apparatus axis B.A. unit balance ballistic galvanometer bridge wire C₂ calibration capacity centre charge Clark cell closed coil commutator condenser conductor connected constant copper curve d₁ d₂ deflection determined discharge distance dt dt electrodynamometer electromotive force equal equation error flux grammes Hence high resistance instrument insulation internal resistance iron K₁ known resistance length magnetic field maximum means measured mercurous sulphate mercury method microfarad moment of inertia mutual inductance needle non-inductive observed obtained Ohm's law ohms parallel passing placed plane platinum pole position potential difference proportional quantity of electricity R₁ R₂ ratio reading resistance boxes reversed scale self-induction shunt silver solenoid solution standard cell steady current tangent galvanometer temperature coefficient tion torsion turns V₁ vanometer voltmeter volts weight Wheatstone's bridge zero zinc sulphate zinc sulphate crystals
Popular passages
Page 17 - AH a unit of resistance, the international ohm, which is based upon the ohm equal to 109 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 329 - Take mercurous sulphate, purchased as pure, mix with it a small quantity of pure mercury, and wash the whole thoroughly with cold distilled water by agitation in a bottle ; drain off the water, and repeat the process at least twice.
Page 326 - The liquid should consist of a neutral solution of pure silver nitrate, containing about 15 parts by weight of the nitrate to 85 parts of water. The resistance of the voltameter changes somewhat as the current passes. To prevent these changes having too great an effect on the current some resistance besides that of the voltameter should be inserted in the circuit.
Page 158 - The anode is then immersed in the solution so as to be well covered by it and supported in that position ; the connections to the rest of the circuit are made.
Page 17 - The unit of current shall be what is known as the international ampere, which is onetenth of the unit of current of the centimeter-gramsecond 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...
Page 18 - ... 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 \\\% of the electromotive force between the poles or electrodes of the voltaic cell known as Clark's cell, at a temperature of 15° C., and prepared in the manner described in the accompanying specification...
Page 18 - 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 18 - As the unit of induction, the 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.
Page 326 - In employing the silver voltameter to measure currents of about one ampere, the following arrangements shall be adopted: The kathode on which the silver is to be deposited shall take the form of a platinum bowl not less than 10 cms in diameter, and from 4 to 5 cms in depth.
Page 159 - It is then rinsed successively with distilled water and absolute alcohol and dried in a hot-air bath at a temperature of about 160° C.