If you want to make electric current, you need to understand electromagnetism. In the history of modern earth, on October 17, 1831, Faraday discovered the phenomenon of electromagnetic induction for the first time, and then obtained the method of generating alternating current, which is an important achievement in electromagnetism.

The so-called electromagnetic induction phenomenon is that when a magnet passes through a closed line, an electric current is generated in the line.

Taking advantage of this phenomenon, the closed line is kept stationary and the magnet is constantly turned. If the closed circuit is at rest and the magnetic inductance line emitted by the magnet is cut, then the current will be continuously generated in the line, and the mechanical energy will be converted into electrical energy, thus becoming a simple generator. This is the knowledge in high school physics textbooks, which is not very profound, but some troublesome things are the realization of basic materials and basic parts.

In order to keep this engine running, it is not possible to rely on manpower, it is inefficient and error-prone, and the only way to do it is to rely on natural resources, either wind or water. Richard chose wind power, so he designed a windmill to make for craftsmen.

However, craftsmen can only make some simple parts, such as complex rotors, energy storage equipment, shafts, etc., which must be done by themselves, which is very laborious. Because of this, I don't want to do this until I have to.

But now that it's decided, it's the only way to do it.

The first is the making of the rotor.

The main material of the rotor is magnets, neodymium iron boron magnets, samarium cobalt magnets, alnico magnets, iron-chromium-cobalt magnets. But at present, this world is within the territory of the Blue Lion Kingdom, and there are no magnets of any kind at all, so you can only make them yourself. The type you choose to manufacture is the simplest and most common one - ferric tetroxide (Fe3O4) magnets.

To make an iron tetroxide magnet, you need to get the material of ferric tetroxide.

In order to obtain this material, there are many methods, such as the hydrogen reduction method of α-iron oxide, the slow oxidation method of ferrous hydroxide, the Harber method, the addition method, the alkali addition method, etc., and the addition method is one of them. The two most critical reaction substrates of this method are elemental iron (iron filings, Fe) and iron oxide (rust powder, Fe2O3......

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Taking a deep breath, Richard washed his hands, put on a dust mask to prevent powder from entering his mouth and nose, and began to operate.

First, Richard put iron filings in sulfuric acid. It can be seen to the naked eye that as soon as the beaker is put in, a large number of bubbles will immediately emerge, and the reaction will be violent, and ferrous sulfate (FeSO4) will be formed in the process.

After the reaction, Richard began to add caustic soda (NaOH) and iron oxide (Fe2O3). Then it is heated to 95~105 °C, and the addition reaction is carried out in the solution to finally produce ferric oxide.

However, the ferric tetroxide was not pure at this time, and Richard transferred the solution to a funnel with filter paper and began to filter. After filtration, the filtered solid matter is dried, and then a series of operations are carried out, and finally a lot of effort is finally made to produce pure ferric oxide.

Then, through magnetization, ferric tetroxide becomes a real magnet, and it is pitch black. Repeat this step, make a sufficient number of magnets, fix them in a ring-shaped mold, and make the most important part of the generator - the rotor.

After doing this, Richard did not rest, and began to make energy storage equipment again, after all, windmills can generate electricity, but electricity has to be stored before it can be used. This requires a real rechargeable battery, not a fruit battery, not a capacitor like a Leyden bottle.

Richard is going to make lead-acid batteries, which are the cheapest and most common electric car batteries on the modern planet.

It was chosen because the material is easy to collect on the one hand, and because of the simple structure on the other hand, with only four parts: positive plate group, negative plate group, electrolyte and container.

In addition to sulfuric acid, which acts as an electrolyte, there is actually only one, or two, substances that are needed:

The first, lead, is used to make groups of negative plates.

The second, lead oxide in the air, lead oxide, is used to make a group of positive plates.

In the current medieval world, there may be many things missing, but lead cannot be missing. Because according to the development of the modern earth, in more than 2,000 years AD, human beings began to refine a large number of iron, copper, silver and lead metals.

So, without much effort, Richard was able to get enough lead and lead oxide.

Taking a deep breath, Richard's gaze became a little solemn.

Both lead and lead oxide are toxic. Excessive inhalation and ingestion can cause heavy metal poisoning, ranging from physical discomfort to death.

In the ancient Roman era of modern earth, the ancient Romans did not know the harm of lead, and used lead pipes as water pipelines for a long time, and used lead as a container for drinking, which led to chronic lead poisoning in a large number of people, which became an important reason for the decline of ancient Rome.

Richard knew this and didn't want to repeat the mistakes of the past, and didn't want to be seriously ill before becoming a wizard, so he did plenty of precautions before conducting the experiment.

Put on a dust mask, then a bird's beak mask on the outside, a tight-fitting black protective suit that covers all the skin, and finally a glove made from a cow's bladder.

After getting ready, Richard took a deep breath and felt the air pass through the herbal sac in the beak mask and pour into his lungs.

The first is to pour enough sulfuric acid into the prepared container as a resolving solution. Then insert the gray velvet lead plate that acts as the negative electrode into the container and fix it. Then put in the tan lead oxide plate as the positive electrode and fix it.

Between the positive and negative electrodes, a separator is placed to prevent the electrodes from contacting. After that, this step is repeated repeatedly, inserting a lead plate and a lead oxide plate into the container, and finally the whole container is full.

The reason for this is that multiple groups of positive and negative plates are put together to play a series effect, thereby increasing the voltage of the lead-acid battery.

After doing this, Richard breathed a sigh of relief, knowing that the main work of the lead-acid battery had been completed, and the next thing was to set up trivial details such as external wires.

Piecemeal, until the evening, Richard finally finished it all.

"Bang bang" two soft sounds, put the made lead-acid battery and rotor on the wooden frame, Richard turned around and took off his gloves, took off his beak mask, took off his dust mask, and took off his protective clothing, only to find that his whole body was soaked.

After all, it was a hot summer, and even in a relatively cool palace, working all afternoon was extremely sinful. When he was working, he didn't notice it, and when he was done, Richard felt that his underwear was clinging to his skin, and his whole body was extremely sticky.

Frowning, Richard pushed the door open and walked out of the independent laboratory.