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Updated: June 10, 2025
Now, if that calc. is right, and I know it is, do you see how narrow the permissible limits of shifting are? Look at equation 236. Believe me, I sure was lucky, that day in the Bureau. It's a wonder I didn't blow up the whole works. Suppose I hadn't been working with a storage cell that gave only four amperes at two volts? That's unusually low, you know, for that kind of work."
The Phoenix began to uncoil the wire, while David gazed up doubtfully at the shadowy maze of lines and insulators on the cross-arms. "Electricity," said the Phoenix thoughtfully, "is a complicated and profound subject. There are amperes, and there are volts, and there are kilowatt hours. I might also mention positive and negative and ah all that sort of thing. Most profound.
The only differences between this and the preceding transmitter are: the magnetic modulator, if you use one, should have an output of 3-1/2 to 5 amperes; you will need two 50 watt oscillator tubes with sockets; two 150 watt rectifier tubes with sockets; an aerial ammeter that reads to 5 amperes; three 1 mfd. filter condensers in parallel; two filter condensers of 1 mfd. capacitance that will stand 1750 volts; and a 300 milliampere filter reactor.
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.
The required parts are the 50 watt tube; the grid leak resistance; the filament rheostat; the filament storage battery; and the magnetic modulator. It is not advisable to use an induction coil for the modulator for this set, but use, instead, either a telephone transformer, or better, a magnetic modulator of the second size which has an output of from 1-1/2 to 3-1/2 amperes.
The little group in the machine shop was soon deep in the discussion of ohms, amperes, volts and currents, and, for a time, Tom almost forgot the message calling him to Philadelphia. Taking advantage of the momentary lull in the activities of the young inventor, I will tell my readers something about him, so that those who have no previous introduction to him may feel that he is a friend.
The total energy of an electric current as it passes through a solution is distributed among three factors, first, its potential, which is measured in volts, and corresponds to what is called "head" in a stream of water; second, current strength, which is measured in amperes, and corresponds to the volume of water passing a cross-section of a stream in a given time interval; and third, the resistance of the conducting medium, which is measured in ohms.
Water Valve Analogue of Electric Resistance. A- a valve limits the flow of water. What Ohm's Law Is. If, now, you know what the current flowing in a circuit is in amperes, and the electromotive force, or pressure, is in volts, you can then easily find what the resistance is in ohms of the circuit in which the current is flowing by this formula: Volts E = Ohms, or = R Amperes I
What appeared to astonish him was the fact that the British boat had been able to make an attack in such weather. We are now charging on one engine, 500 amperes on each half-battery. We are due back at Zeebrugge at 10 p.m. to-night.
Water Valve Analogue of Electric Resistance. A- a valve limits the flow of water. What Ohm's Law Is. If, now, you know what the current flowing in a circuit is in amperes, and the electromotive force, or pressure, is in volts, you can then easily find what the resistance is in ohms of the circuit in which the current is flowing by this formula: Volts E = Ohms, or = R Amperes I
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