## Electrical Measurements: A Laboratory Manual |

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adjusted alternating current amalgam ammeter ampere ance angle apparatus axis B.A. unit balance ballistic galvanometer battery circuit bridge wire calibration capacity centre charge Clark cell closed coil commutator condenser conductor connected constant copper current flowing curve Daniell cell deflection determined discharge distance electrodynamometer electromotive force equal equation error Example flux grammes Hence high resistance horizontal instrument insulation internal resistance iron known resistance length magnetic field maximum means measured mercurous sulphate mercury method microfarad movable coil mutual inductance needle non-inductive observed obtained Ohm's law ohms parallel passing placed plane platinum pole position potential difference proportional quantity of electricity ratio reading resistance boxes reversed ring scale self-induction shunt silver solenoid solution square standard cell steady current tangent galvanometer temperature coefficient terminals tion torsion turns vanometer voltmeter volts weight Wheatstone's bridge zero zinc sulphate crystals

### Popular passages

Page 17 - 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 17 - As a unit of current, the international ampere, which is one-tenth of the unit of current of the CGS system of electro-magnetic 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 accompanying specifications,1 deposits silver at the rate of o.ooi 1 1 8 of a gramme per second.

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...

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 327 - 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.

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 327 - 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 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 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 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. After the last washing, drain off as much of the water as possible.