"There's an easier way."

With the appearance of this sentence, a young man who was not smiling and was wearing a straight board walked out from behind.

"Wang Yu?" Wang Bo recognized the person at the first time.

"Aren't you in the first class? How did you get there? ”

"Our class is setting up camp, my tent has been finished, I'm bored, so I'm going to come and see your class nine."

Wang Yu replied very formally, and then smiled:

"Sure enough, your Class 9 is as interesting as I thought."

"Creating difficulties for oneself through outings, and then solving them by using one's own knowledge, is indeed very Mr. Ren's style."

"Even if you have a style, it's the head teacher of Class 9, so don't mess around."

Listening to Wang Yu's words, Wang Bo's heart tightened for no reason, and he immediately looked at the other party vigilantly.

This grandson still doesn't give up on his homeroom teacher~

You have to be on guard!

"You don't have to guard me like a thief, I just want to experience the joy of learning with you." Wang Yu shook his head helplessly, spread his hands, and showed that he was innocent.

Wang Bo and the others glanced at each other, and their mentality relaxed slightly.

After the last 'cooperation', Wang Bo and others also know Wang Yu's style, and under normal circumstances, they still say that one is one.

But even then, at most, they allow each other to come and play occasionally.

But if the other party really plans to turn Ren Yan to the first class, then they still have to resolutely resist it all at once.

"What's the easier way you just said?"

After the atmosphere eased slightly, Wang Bo asked his doubts.

"Batteries." Wang Yu replied naturally.

Then he walked to the pile of miscellaneous items in Class 9, picked up a battery scattered outside, and then pointed to the pocket containing the miscellaneous items and asked, "Is it okay for me to take a piece of wire from it?" ”

Wang Bo nodded, but then he felt that something was wrong: "How do you know that we still have wire?" ”

"You're all about to fence yourself off with wire, and who can't see it." Wang Yu laughed noncommittally and lowered his head to rummage for the wire.

This made Wang Bo on the side slightly embarrassed.

Made, careless, forgot that she asked her classmates to do the fence before!

Not long after, Wang Yu took out a small piece of wire from the sundries and looked at Wang Bo and the others.

Then under the gaze of Wang Bo and others, he took out a little toilet paper from his pocket and wrapped the middle part of the wire.

The other two ends are pressed directly on the positive and negative poles of the battery.

Three seconds later.

The toilet paper in the middle of the wire burned directly.

Looking at the almost instantaneous flame in front of them, Wang Bo and the others blinked, a little confused for a while.

What kind of principle is this?!

In these days, is it so easy to light a fire with your bare hands?

What's the use of such a thing as a damn lighter?!

Looking at the obviously stupid eyes of Wang Bo and the others, Wang Yu extinguished the flames, and smiled Yingying began to explain:

"The principle is actually very simple, mainly using electric current."

"After the electric current passes through the conductor, it will leave a certain amount of energy, and this energy will always be presented in the form of heat on the metal material of iron wire."

"At this time, find some substances with a relatively low ignition point, and it will easily be ignited."

"I think that's probably why Mr. Ren didn't bring a lighter directly, but a bunch of batteries."

"After all, it's just some very basic physics."

Wang Yu's explanation was very popular, and Wang Bo and others also understood it very clearly.

But then they were a little confused.

What the hell is physics for Mao?!

As the saying goes, if you learn mathematics, physics and chemistry well, you will not be afraid to go all over the world.

Previously, they thought it was nonsense, how could mathematics, physics and chemistry be more effective than money.

But now it seems that this sentence may still be a true sentence!

But then, they looked at Wang Shanhai.

The meaning of that gaze is also clear.

Look at the people!

It's also the use of physics, and people's ignition is realistic and comfortable, and it's even a matter of bending over!

And to get to you, you have to make discs, you have to pump ropes, and the key is to make a wooden board with a fire groove carved into it, which is not too cumbersome!

As an adult, I'm not like a student.

Little brother, can you do it?!

At this time, Wang Shanhai, who was standing on the side, was also a little crazy in his heart.

Looking at Wang Yu's harmless smile, he felt a little stomach pain.

At this moment, he wanted to persuade Wang Yu cordially.

Children, pretending to be someone else's B is easy to be beaten in society, do you know it!

This method of battery ignition, he originally intended to use it as a killer tool, and tell Wang Bo and others step by step.

Let them admire their 'erudition' and then brush a wave of existence, paving the way for the future of father and son recognition.

Although all this was told to him by Ren Yan.

But that doesn't prevent you from using it to install X!

Well, now B hasn't finished loading it, and he was cut off by a child, and he just installed it to the end.

Do you know what step-by-step means and what foreplay is!

Wang Shanhai was unusually tired, but at the same time he was also surprised.

The method of battery ignition, to be honest, is very simple, as long as it is said, but all modern people can understand it.

But that doesn't mean everyone thinks of it in time.

There is always an invisible gap between theory and application, which requires a long period of exploration and observation.

But now, a high school student can think of this method as soon as he sees the battery.

This surprised him.

When I went to high school, I wouldn't have this kind of 'practice' boss.

What do today's children eat to grow up, and have they all grown up to this point?

However, after glancing at his sons, Wang Shanhai was still relieved.

Maybe, it's just that this child named Wang Yu is a special case...

And Wang Yu completely ignored Wang Shanhai's 'tangled' eyes, and after demonstrating the method he had come up with, he came to the flywheel firearm.

Observed with interest.

"Although this thing looks quite cumbersome, the mechanical structure in it is really ingenious, inertia, friction, centrifugal force, energy conversion..."

"There are indeed a lot of knowledge points included, and it is difficult to think of this if you are not a person with rich theoretical knowledge."

After looking at it for a while, Wang Yu looked at Wang Shanhai sincerely and sighed: "Uncle, you are really unusual, and you have a fight with Teacher Ren." ”

After hearing this, Wang Shanhai instantly felt a lot more relaxed.

Looking at Wang Yu's eyes, he also became kind.

This young man is still very eye-catching~