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Updated: June 3, 2025
We now tried the crucial test of passing the etheric current through the sciatic nerve of a frog just killed. Previous to trying, we tested its sensibility by the current from a single Bunsen cell. We put in resistance up to 500,000 ohms, and the twitching was still perceptible.
Our telegraph and telephone wires were formerly made of iron for the sake of economy, but copper is now used for these lines, as well as for distributing electricity on a large scale. The copper wire now commonly used for the telegraph has a resistance of something like four ohms to the mile." "You are making good progress," said Thorwald.
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
"Put a coil of wire over the end of rod X and passed the ends of spool through galvanometer without affecting it in any way. Tried a 6-ohm spool add a 200-ohm. "By increasing the battery from eight to twelve cells we get a spark when the vibrating magnet is shunted with 3 ohms. Cannot taste the least shock at B, yet between carbon points the spark is very vivid.
Here are some of the results obtained from experiments made with the Holtz machine. A machine with a plate 46 in. in diameter, making 5 turns in 3 seconds, produced a constant current capable of decomposing 3½ millionths of a milligram in a second. This is equal to the effect produced by a Grove's cell in a circuit of 45,000 ohms resistance. The current produced would be about 0.0000044 ampere.
That is, if you divide the current in amperes by the electromotive force in volts the quotient will give you the resistance in ohms. Or if you know what the electromotive force of the current is in volts and the resistance of the circuit is in ohms then you can find what the current flowing in the circuit is in amperes, thus: Volts E = Amperes, or = I Ohms R
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