Li Chengfeng picked up the electric fan blade in his hand and put it on the power rotation hub.

Li Yuan also followed curiously.

Li Yuan reached out and touched the blade of the electric fan, and said, "Grandson, you said that this thing can produce wind as long as it rotates?" But how's the rotation method? You can't use your hands, can you? Then it's better to let Gonggong Wu fan you directly? ”

"Wrong grandpa! Grandpa Wu, on the talent! ”

"Yes, Eighth Prince!"

So, when Li Chengfeng connected the two copper wires behind the power rotation hub, Wu Gonggong held a power generation box and shook his hand.

"Squeak ......"

The hub of the electric fan was really affected by the electricity and spun up?

"Yes, Grandpa, look, I succeeded! I successfully invented the electric fan in Datang! ”

"Huh? Weird! ”

Li Chengfeng jumped up excitedly, but Li Yuan's eyes widened.

Can the blades of this electric fan made of wood really spin?

"Blame, grandson, how did you make this? It's just a few pieces of wood, but why do they spin on their own? ”

"Whirring ......"

A cool wind blew, and Li Yuan suddenly felt a burst of refreshment.

Good guys, if you have this thing, you won't be afraid of it in the hot summer.

Even in a hot, airy bedroom, can this thing create wind out of thin air?

Li Yuan couldn't help but want one!

"Grandson, what is the truth of this? Why does it rotate automatically without human intervention? ”

Li Yuan asked suspiciously.

And Li Chengfeng explained: "Grandpa, as you said before! Generally speaking, the movement of any object requires external force to do work! But in the absence of external forces, electricity can achieve all this! You see, I made Gonggong Wu shake the power generation box, which drove the rotation of the blades of the electric fan and sent out a cool breeze! ”

"The first point is that through these things I invented, I converted the external force of Wu Gonggong shaking the power generation box into electricity, and then converted the electricity into the power for the rotation of the electric fan! In this way, it is equivalent to using a small amount of work, and you can get a great return! And the generator I invented is to transform the power of Wu Gonggong's work into great energy! Grandpa, do you understand? ”

"Uh...... This, this ......"

Li Yuan touched the back of his head unconsciously, and couldn't help but glance at Li Chengfeng.

Is this baby playing tongue twisters?

Why can't I understand a word?

What the hell is he talking about?

Although Li Yuan didn't understand, he still felt that it was amazing.

After all, Li Chengfeng's invention of the electric fan has subverted Li Yuan's three views.

Is this just a wind out of thin air?

It's too strong, if Li Chengfeng can use this thing on the battlefield, then what's the deal?

Thinking of this, Li Yuan suddenly felt a sigh in his heart.

Li Yuan hurriedly asked, "Grandson, may I ask, can you still make a bigger electric fan?" ”

"Absolutely! With enough electricity and enough materials, I can make a super electric fan! ”

"Is that the kind that can blow people away?"

"Well, I want to think about it! If there is enough electricity, it should be possible! But, in this case, it seems a little difficult! Because there are no materials! ”

Li Yuan thought to himself, his grandson actually has a way to make an electric fan that blows people away? Is that still a deal?

"Grandson, you say, what materials do you need? Grandpa, I'll find it for you now! Li Yuan hurriedly said.

"Oh, don't worry, that thing is called plastic, you can't get it!" Li Chengfeng responded.

"Grandpa, I know what you think! You want to use the electric fan I invented to take to the battlefield, right? But this idea doesn't work for now! Don't worry about it! ”

"Alas, yes, it's grandpa who is anxious! Forget it, grandson, your electric fan has been repaired, why don't you come and play chess today, okay? ”

"Okay, no problem, come, 100 gold in a game, I'm going to kill you today without leaving a piece of armor!"

"Yo, don't give face to grandpa, do you? Okay, then grandpa, I'm welcome! Hmph, I don't believe it, I can't beat you in a game! ”

"Come on, come on, let's see who's good!"

So, Li Chengfeng and Li Yuan, you and I, began to play chess under the electric fan.

Li Yuan's beard, which was blown by the cool breeze, was swaying one after another, so comfortable.

Gonggong Wu was shaking the generator on the side, although he was sweating profusely, but when he saw the moment when the Emperor Li Yuan and the Eighth Prince Li Chengfeng were having a good time, Gonggong Wu's face also showed a happy smile.

……

At the same time, the Tang Palace, inside the Wenxuan Pavilion.

Li Shimin has nothing to do today, and after reading the folds, he plans to come to the Wenxuan Pavilion to see if Li Chengfeng, a little guy, is in class or not!

Li Shimin thought to himself, with his own father, the emperor Li Yuan, going out of the horse, presumably that little rabbit cub must be obedient to Li Yuan's system.

Anyway, Li Yuan is also the emperor of the previous dynasty, and the momentum on his body is not a joke.

Li Yuan is out of the horse, Li Shimin is very confident, and feels that Li Chengfeng will definitely come to the Wenxuan Pavilion to take classes today!

Unknowingly, I haven't seen Li Chengfeng for a week, and to be honest, Li Shimin still misses Li Chengfeng a lot in his heart.

Although he is mischievous and mischievous, he is extremely smart, and he can be described as a genius among geniuses at the same age!

And children, it's normal to be naughty, if you are too obedient, Li Shimin will think that this baby is obedient and unproductive!

Li Shimin touched his beard and came to the Wenxuan Pavilion.

"The emperor has arrived!" The eunuch on the side shouted.

In the Wenxuan Pavilion, Du Ruhui, who was in class, hurriedly came out to greet Li Shimin.

"Long live the emperor! Your Majesty, why did you come to the Wenxuan Pavilion? Regarding the treatment plan of the 'South-to-North Water Diversion', Lao Chen is discussing with Liang Guogong! Because the project is too large, it may take a while to give the emperor a perfect project answer! ”

Du Ruhui said respectfully.

Li Shimin nodded with satisfaction and said, "Well, Lai Guogong, I didn't come to you to ask you for the engineering drawings of the 'South-to-North Water Diversion'!" I just want to ask, the Eighth Prince, did he come to your Wenxuan Pavilion to take classes? ”

"Back to the emperor, no, in these seven days, the old minister has not even seen the eighth prince, let alone he will come to the old minister's Wenxuan Pavilion to take classes!"

"What? He didn't come? ”

This little rabbit cub, can't even my father Li Yuan handle him?

However, how did Li Shimin know that the current Li Yuan was sitting under the electric fan with Li Chengfeng, happily playing chess!