The principle of galvanic battery, junior high school chemistry knowledge, the copper sheet and zinc sheet are immersed in sulfuric acid solution, and the zinc sheet loses electrons due to oxidation reaction, which is the negative electrode; The copper sheet undergoes a reduction reaction to obtain electrons, which is the positive electrode. Pen @ fun @ pavilion wWw. ｂｉｑUｇE。 ｉｎｆｏ

Chemical energy becomes electrical energy, the principle is very simple, Yuwenwen can't make sulfuric acid, so using saturated salt water as an electrolyte, the effect is poor, but it is still useful.

Against the sky? God knows, to reproduce such a simple principle, it will be struck by lightning, and God's threshold is too low.

The battery is available, but how to apply it is a big problem, first of all, how to measure the voltage and current intensity?

In modern electrical knowledge, the unit of voltage is "volts", the unit of current intensity is "amperes", the unit of resistance is "ohms", and the unit of capacitance is "farad".

He remembered all of this, but then the question was: What is the definition of these units of electricity?

How much voltage does it have to be one volt? How much current strength should be to be one ampere?

Where does he know what the definition of these units is, of course, for Yu Wenwen at this time, volts, ampere, these terms don't matter, the core problem is how to determine and measure the unit of measurement of voltage and current.

If you want to do a good job, you must first sharpen your tools, and before determining the unit of electricity, you must have something that can measure the magnitude of current and voltage.

Wrap the wire around the iron nail to make a simple electromagnet, the current passing through the wire directly affects the magnetic force of the electromagnet, the larger the current, the stronger the magnetic force, then the pointer attracted by it will rotate the amplitude.

This was one of the few remaining electrical knowledge in his mind, but he could make a simple galvanometer.

With an ammeter, the resistance on the series can be converted into a voltmeter, the pointer deflection is determined by the current in the meter, and the reading is equal to the voltage distributed by the voltmeter itself as a resistor.

If the current and voltage can be measured, then according to Ohm's law, the current is equal to the voltage multiplied by the resistance, and the resistance can be calculated.

This is junior high school physics knowledge, many people forget it after graduation, but he has not forgotten, although the ammeter and voltmeter made are very simple, but this is enough.

The galvanic battery made of saturated salt water of a specific volume and concentration is used as the electrolyte, and the copper sheet and zinc sheet of a specific size and weight are used as the positive and negative electrodes, and the galvanic battery made by this is measured several times of current and voltage, and its average value is the standard unit.

In order to pay tribute to the two scientists, the units of current and voltage are still amperes and volts, of course, the definition at this time is different from that era.

I am in charge of my electricity, Yu Wenwen thinks so.

So if you have electricity, you have to have light?

However, he is not a genius, and he can't make a light bulb.

Junior high school physics knowledge, the law of electromagnetic induction, through which a generator can be made, and then the electric motor is reversed, and the principle verification machine for hydroelectric power generation in the workshop is already available, but after the unfortunate electrocution of a few people, the progress is frozen indefinitely.

Safety first, electricity safety is not a joke, so we have to take it step by step, "strong electricity" can't afford to play, then play "weak electricity", and first put the galvanic battery into practical use.

Yu Wenwen was going to let his children experience another device today, but it was too late, so he took it out himself now to review and review, so that he could explain it well next time.

This device is similar to the simple electric bell, both have an electromagnet, and also have a thin iron plate, but there is no bell hanging on the other end of the iron plate, so it is just an armature.

The circuit is very simple, the first pole of the battery, the knife switch, the electromagnet, the other pole of the battery, the armature is not in the circuit, but above the electromagnet.

Yuwenwen connected the device to the battery, and then closed the knife switch, after the circuit was turned on, the electromagnet took effect, and the magnetic force generated sucked down the armature above it, and after disconnecting the gate knife, the electromagnet failed, and the armature was then upturned to restore its original state.

In other words, in this circuit, with the help of electromagnets, wires and galvanic batteries, the action of the armature and the action of the knife switch can be consistent, falling and lifting together.

If the wire is long enough, then inside this circuit, the battery and the knife switch can be placed in one place, and the electromagnet and armature can be placed far away.

When one person closes the switch, the armature in the other place also falls; Synchronization between the blade and armature, which conveys simple information according to specific rules.

The phone doesn't make it, but there's something else to try, isn't it?

。。。。。。

At night, on the lakeside in the northern suburbs of Xiyang City, in a corner of the lakeside manor of Yi Guogong, two rooms about 30 steps apart were brightly lit, and several young people were busy in the rooms.

At the top of the two houses stood shelves with a long line attached to them, which was not a normal line, but a "wire".

Iron twisted pair wire, a single iron wire coated with tung oil, and wrapped with a layer of red tarpaulin, and another iron wire wrapped with blue tarpaulin twisted, a thicker twisted iron wire is made, and the outer layer is also wrapped with tarpaulin.

Thanks to the help of the hydraulic wire drawing machine, a single iron wire can be drawn very thin without guaranteeing the basic strength, but even so, the weight of the iron twisted pair is not light, even when the total length of this wire is only 50 steps.

In the room on the east side, several wooden barrels are lined up, and their lids are respectively inserted with copper rods and zinc rods, which are copper-zinc galvanic cells with saturated salt water as the electrolyte, and are connected in series with wires to supply power to a circuit.

There is a simple device on that circuit, which is something like a knife switch on the table, but the handle of the knife becomes a concave disc that is easy to press with fingers, and its lower end is tapered, and when pressed, it can contact the copper bar on the chassis.

This knife switch has a special shape, so it has a new name, called "electric key".

"The wires are connected, please check the circuit!"

"The battery is checked, the current is normal, the voltage is normal!"

"Translator, start decoding according to these words, you, responsible for reviewing!"

"Decoded!"

"Review complete, confirmed!"

"Ring the bell to notify them that they're ready to start!"

One person pulled down the knife switch on the desk, and at the same time, an electric bell rang in the west room, which was the east side to inform the west side, and it was about to start.

They also pulled down the switch, and the bell in the east room rang with it, and it was the west side that informed the east side that they were ready.

In the east room, a young man took a note handed to him by the interpreter, and pressed the electric button intently according to the group of dots and strokes written on it.

The short press of the electric key represents the "point", and the long press represents the "stroke", and the circuit transmits the action of the electric key to the armature in the west room, and at the end of the armature is a charcoal pencil, drawing dots and strokes on the moving paper strip with the manual hand.

There are three groups of armatures, and there are also three people who shake the note, and the three groups of armature record dots and strokes on the note at the same time, and I don't know how long it has been, the armature no longer moves, and the bell rings, indicating that the "send" is over.

The people who had been waiting for a long time were divided into three groups to pick up the slips of paper, and one person copied the dots and strokes in the notebook, and listed them in a group of symbols, which were Bishop Lang's "Arabic numerals".

The other looked through the comparison table, found out the Chinese characters corresponding to the group of numbers, and wrote them down.

After proofreading several times and making sure that it is correct, the three groups of people summarized the results, dotted and stroked and finally gathered into one sentence: I won't say anything if I am killed.

"Huh? What does this mean? ”

"What do you mean, after a while you go over, they ask you, did you say, 'Kill me and don't say'? And then they beat it? One of them said narrowly.

"Huh? So, then what should I say? ”

"Stupid, take the paper with the contents written on it and let them read it for themselves." (To be continued.) )