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Updated: June 7, 2025
Such resistance represents a length of eighteen miles of ordinary telegraph wire. After this, 700 ohms were overcome with 3.4 volts. This result was obtained by direct transmission, and without an induction coil, and it is probable that it might be much exceeded without sensibly increasing the electromotive force of the current. Le Genie Civil.
It has a diameter of 6-1/4 inches, a height of 7-7/8 inches and a length of 9-3/8 inches, and it costs $11.00. The Aerial Condenser. This condenser is made up of three fixed condensers of different capacitances, namely .0003, .0004 and .0005 mfd., and these are made to stand a potential of 7500 volts.
A 50 to 100 Mile Wireless Telephone Transmitter With Direct Current Motor Generator. As the initial source of current available is taken to be a 110 or 220 volt direct current a motor-generator having an output of 350 volts must be used as before.
Our lower C can lift street-paving. 'It is Hell Hell! cried Dragomiroff, and sobbed aloud. Arnott looked away as he answered: 'It's a few thousand volts ahead of the old shoot-'em-and-sink-'em game, but I should scarcely call it that. What shall I tell the Fleet, sir? 'Tell 'em we're very pleased and impressed. I don't think they need wait on any longer.
She was of a quiet, amiable disposition, innocently coquettish, naturally adapted for the advances of sound common sense and affectionate good- will, not for the volts of passion; she was, moreover, femininely practical.
All of the parts of this transmitting set are the same as for the 500 mile transmitter just described except the motor generator and while this develops the same plate potential, i.e., 1,000 volts, it must have an output of 500 watts; it will cost you in the neighborhood of $175.00.
This adjustment for voltage is made by means of taps brought out from the primary coil to a rotary switch. The high voltage secondary coil which energizes the plate has an output of 175 watts and develops a potential of from 350 to 1,100 volts. The low voltage secondary coil which heats the filament has an output of 175 watts and develops 7.5 volts. It weighs about 15 pounds and sells for $25.00.
This is the same kind of a hot-wire ammeter already described in connection with the experimental set, but it reads to 5 amperes. The Grid and Blocking Condensers. Each of these is a fixed condenser of .002 mfd. capacitance and is rated to stand 3,000 volts. It is made like the aerial condenser but has only two terminals. It costs $2.00. The Key Circuit Apparatus.
"Pray consider," said Peter, "that workmen who have touched the wires, and who have received shocks of only a few hundred volts, have died instantly. The fact is well known. And yet when a much greater force was used upon a criminal at New York, the man struggled for some little time. Do you not clearly see that the smaller dose is the more deadly?"
This relation between these three constants is known as Ohm's Law and as they are very important you should memorize them. What the Watt and Kilowatt Are. Just as horsepower or H.P., is the unit of work that steam has done or can do, so the watt is the unit of work that an electric current has done or can do. To find the watts a current develops you need only to multiply the amperes by the volts.
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