At this time, Long Yan.
Under the guidance of Liu Zheng, Liangzhou Laboratory combined a steam engine with a hand-cranked generator.
Finally the design drawing was produced.
They looked at the design drawings in their hands with smiles on their faces.
With this blueprint, a factory that can generate electricity can be built.
However, in order to ensure that this invention can be successful, these technology geeks in Liangzhou Laboratory used a small steam engine to carry out this modification, so that he could provide the necessary power for the hand-cranked generator.
As a result, they succeeded.
But it was only half the success. They did combine a steam engine with a generator, use the steam engine to drive the gears to rotate, and then let the hand-operated generator generate electricity.
But no matter how fast the steam engine turned the rocker, they still didn't get much power.
It can even be said to be rare.
Regarding this technical difficulty, they don’t know the reason.
They could only invite Liu Zheng to answer them. Liu Zheng thought for a while, and finally remembered the knowledge taught by his teacher in junior high school among his vast knowledge.
The stronger the magnetic force, the more electrical energy is generated.
"Change to some magnets with stronger magnetism and give it a try."
Everyone was stunned and didn't know why, but they still installed the magnet with stronger magnetic force on it as Liu Zheng said.
This time, the steam engine turned the hand-cranked engine and produced more powerful electricity.
But this raises a new problem, that is, although the power generated by this generator has become stronger.
But it is not stable and changes with frequency.
Seeing this situation, everyone became even more confused.
They all looked at Liu Zheng. Liu Zheng didn't understand why such a situation occurred. Finally, after thinking for a long time, he slowly said: "These will be the two directions of our future research."
"One is to increase the voltage of the alternating current we currently produce, but we also need a transformer to control the voltage so that we can get electricity that I can use."
"The other is direct current. Improving this generator allows it to continuously cut the magnetic wire and obtain a continuous and stable current."
But everyone was confused.
Only they knew how to make a generator. As for the alternating current and direct current that Liu Zheng mentioned, they knew nothing about it. They also couldn't understand the voltage and current.
Someone raised their hands and asked: "Master Liu Zheng, we don't quite understand what you said. What do you mean?"
"Yes, yes, Master Liu Zheng, regarding AC and DC, they should both be electricity. What's the difference?"
Liu Zheng was stunned for a moment, looking at these top contemporary scientists who looked confused but eager for knowledge. He almost forgot that no one in this world has yet proposed the electromagnetic theory.
There has been little progress in the development of physics in electricity.
It was all driven by him.
Liu Zheng thought about the knowledge he had learned in his previous life and said: "The so-called direct current and alternating current, you can think of them as a straight iron rod that will never bend."
"Alternating current is a curve that can be transformed, but this curve changes regularly."
Liu Zheng squatted on the ground and drew two different lines, one straight and one winding.
The group of scientists squatted down and looked attentively at the paintings Liu Zheng drew on the ground.
Liu Zheng added: "If you want to understand the biggest difference between these two currents, you need to know a concept, voltage!"
"Voltage can be understood as the size of electricity!"
"In direct current, its voltage is constant and there is almost no change."
"As for alternating current, its voltage curves up and down like this."
"Electricity will be the focus of our development in the future, but you see that the voltage of DC is constant and almost does not change. We have not invented a DC generator yet, but does such a constant voltage mean that it is always strong and will not tire? "
Everyone thought for a while, and someone said: "If this size is constant, then we need to always ensure that it is strong, so that too many resources will not be wasted."
Liu Zheng snapped his fingers and said, "Yes, we know that energy is conserved. It does take more energy to maintain such a strong voltage."
"And having such a large voltage pass through the conductors we create can cause problems."
"You can go and touch the copper wire harness coming out of our generator now. Is it hot or numb?"
Some people just don't believe in this evil, so they touch it, and the result is obvious.
Liu Zheng said everything. The small generator they built was very crude, with poor insulation and exposed copper wires, but this was not a problem.
The generators manufactured now only have moderately strong currents and will not cause harm to people.
Liu Zheng looked at the twitching scientist An Xie covering his hands, looking at him with admiration. Liu Zheng smiled and said, "Is it numb and a little hot?"
Everyone nodded.
Liu Zheng smiled and said: "This requires the introduction of two concepts, one is insulation and the other is resistance."
"Let's talk about insulation first. In the future, any wire harness or machine that is made to touch the current must have rubber on the outside to prevent the current from overflowing."
"You were numb just now because you were hit by an electric current."
"This is just a very low voltage, and the current generator has stopped. If the generator continues to output, you can imagine what kind of situation you will face."
"These currents will cause irreversible damage to your body. Please don't doubt what I say."
"If you have seen what happens to people who are struck by lightning, you should know that I am not alarmist!"
Everyone thought for a moment and shook their heads when they thought of the scene of being struck by lightning.
They don't want to go through that.
Liu Zheng added: "After talking about insulation, let's talk about resistance. The greater the voltage, the greater the current that these copper wires can pass, and they will become hotter and hotter."
"When the voltage reaches a certain level, these copper wires are likely to become hotter and hotter, and eventually..."
"Bang!" Liu Zheng pretended to light a fire: "It will burn."
"So DC is destined to be unsuitable for long-distance transmission. It is impossible for us to build so many power plants on Longyan that can be controlled within safe voltages."
"But alternating current can be transported over long distances, but the instantaneous current can also destroy electrical appliances, just like this telegraph machine we built, which suddenly burned down."
"It is also possible that the telegraph machine will not have stable voltage to operate."
"So we need to convert alternating current into a stable voltage, which requires a transformer."
"As for this tool that can change the voltage, you need to study it carefully. I don't have a good way to do this now."
Everyone nodded, and after carefully considering Liu Zheng's words, smiles appeared on their faces.
