Practical Lessons in Electricity. Elements of Electricity. The Electric Current1903 - 221 стор. |
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action active material alternating current amount ampere-hours amperes annealed apparatus armature attracted booster brushes capacity carbon cause cells in series cent chemical Chloride circuit breaker conducting conductor connected in parallel connected in series consists copper wire coulombs cut-out decrease diameter diaphragm DIRECT CURRENT dynamo electric current electrical energy electrode electrolyte electromotive force engine equal equivalent example external Faure feet flow formula fuse give glass heat Hence horse-power inch increase induction coil installation insulation internal resistance iron joint resistance joules lead length light load machine metal motor negative plate Ohm's law ohms ohms approx operation pipe placed plant platinum pole porcelain positive plate potential required resist rheostat screws secondary short circuit shown in Fig shunt soldered solution specific resistance storage battery substance sulphate sulphuric acid supply surface switch switchboard telephone temperature terminals transmitter voltage volts watts zinc zinc sulphate
Популярні уривки
Сторінка 23 - Must be so placed in wet places that an air space will be left between conductors and pipes in crossing, and the former must be run in such a way that they cannot come in contact with the pipe accidentally. Wires should be run over, rather than under, pipes upon which moisture is likely to gather or which, by leaking, might cause trouble on a circuit.
Сторінка 1 - Every dynamo should be provided with a name-plate, giving the maker's name, the capacity in volts and amperes, and the normal speed in revolutions per minute.
Сторінка 33 - No combination fixture in which the conductors are concealed in a space less than one-fourth inch between the inside pipe and the outside casing, will be approved. h. Each fixture must be tested for "contacts...
Сторінка 36 - Must be placed on all service wires, either overhead or underground, as near as possible to the point where they enter the building and inside the walls, and arranged to cut off the entire current from the building. Where the switch required by rule No. 22 is inside the building, the cutout required by this section must be placed so as to protect it.
Сторінка 26 - Must be protected on side walls from mechanical injury by a substantial boxing, retaining an air space of one inch around the conductors, closed at the top (the wires passing through bushed holes) and extending not less than seven feet from the floor. When crossing floor timbers, in cellars, or in rooms where they might be exposed to injury, wires...
Сторінка 37 - ... the wires ; that is, in a two-wire system the two wires, and in a three-wire system the three wires, must be protected by the cut-out and disconnected by the operation of the switch or circuit breaker.
Сторінка 50 - ... the floor. When crossing floor timbers in cellars or in rooms where they might be exposed to injury, wires must be attached by their insulating supports to the under side of a wooden strip not less than one-half an inch in thickness.
Сторінка 6 - As the area of a circle is proportional to the square of its diameter, it follows that the resistances of round conductors are inversely proportional to the squares of their diameters.
Сторінка 38 - ... inches between the ceiling and the board, in order to prevent fire from communicating from the switchboard to the floor or ceiling and also to prevent the forming of a partially concealed space very liable to be used for storage of rubbish and oily waste.
Сторінка 49 - When incandescent lamps are used for decorative purposes, as in the use of miniature colored lamps, and it is necessary to run two or more in series, permission should always be secured, in writing, from the Inspection Department having jurisdiction. Arc Lamps should be carefully isolated from inflammable material, should be provided at all times with a glass globe surrounding the arc and securely fastened upon a closed base. No broken or cracked globes should be used, as they are designed to prevent...