Electrical Catechism: An Introductory Treatise on Electricity and Its Uses |
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Electrical Catechism: An Introductory Treatise on Electricity and Its Uses George Defrees 1864- Shepardson No preview available - 2021 |
Common terms and phrases
acid alternating current ammeter amount amperes arc lamps armature armature wires attraction becomes belt brushes carbon causes cell charged chemical circular mils collecting rings common commutator condenser conductor connected in series constant copper current passes curve diameter difference of potential direct current direction distance divided dynamo elec electrodes electrodynamometer electromagnet electromotive force energy equals the product field coils field magnet figure fuse galvanometer give heat incandescent lamps increases induction instrument insulated iron core less light lines of force lines per square load machine magnetic field magnetic lines measured melting metal motor multiplied needle negative number of lines number of turns Ohm's law ohms plates poles positive pressure pull rent resistance rheostat sal ammoniac secondary series coil shunt dynamo sometimes spark speed square centimeter square inch static electricity surface switch temperature terminals transformer unit voltage voltmeter volts watts zero zinc
Popular passages
Page 55 - 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 56 - 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 92 - The lower limit is specified for rubber-covered wires to prevent gradual deterioration of the high insulations by the heat of the wires, but not from fear of igniting the insulation. The question of drop is not taken into consideration in the above tables.
Page 56 - As a unit of electro-motive force, the international volt, " which is the electro-motive force that, steadily applied to a " conductor whose resistance is one international ohm, will '• produce a current of one international ampere...
Page 57 - The unit of electromotive force shall be what is known as the international volt, which is the electromotive force that, steadily applied to a...
Page 57 - 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 55 - ... 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 56 - 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 Ampere 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 millionths of a gram per second.
Page 57 - As the unit of induction, the henry, which is the induction in a circuit when the electromotive...