Lin Nan desperately recalled the electrical knowledge in the physics textbook, and then replied a little uncertainly: "Because they are connected in parallel with other lights, and then one is open and the other voltage is unstable or poorly contacted?"

Lin Wolf smiled in his heart, it was really a "textbook" answer.

Ha ha.

But he didn't judge whether it was right or wrong, but continued: "Then will you fix these two light bulbs? When I was your age, the electrical appliances in the house broke down, but I repaired them!"

Lin Nan grinned and asked, "Did you have appliances at home when you were my age?"

As soon as the words fell, Lin Nan left the room to look for tools, obviously he accepted the task of the wolf wood.

Lin Wolf smiled and said nothing, but he was very happy in his heart, his son actually began to ask him, maybe soon I will no longer be the serious image I used to be in his heart, but a friend, a friend who has nothing to say.

Soon, Lin Nan went to bring a wooden chair that was a little high, put it under the light bulb that was not lit, and brought a brand new light bulb in the living room drawer.

The light bulb was fixed to the ceiling, and a wire connecting it could even be seen next to it, passing through the corner and then to the switch on the wall.

Many old houses in the countryside are like this, and instead of hiding the water and electricity in the walls, they are exposed, so the chance of damage will be high.

The timber wolf stood and watched.

I saw that after Lin Nan put the chair directly below, he first went to turn off the switch of the light bulb, and then turned his head to look at the wolf wood.

Looking at each other, Lin Wolf consciously walked over and helped the chair up, and Lin Nan quickly climbed up.

13-year-old Lin Nan is about 175, which looks a little shorter than the 178-year-old timberwolf, but he can almost touch a fixed light bulb.

This is the first time Lin Nan has "repaired the light bulb", he first tentatively touched the glass outside the light bulb, it was cold and cold, it seems that the inside is really completely broken, so it will cause a "broken circuit".

Then, Lin Nan gently pulled it down, and found that it couldn't be pulled off, so he put more effort into it, and found that it still couldn't be pulled off.

Lin Nan stopped the movement of his hand and carefully observed the structure of the bulb, and soon he found that there was a spiral part inside.

With a roll of his eyes, Lin Nan gently pinched the glass part of the bulb and began to rotate counterclockwise, the bulb really loosened, and after turning it several times, it was taken off by Lin Nan.

Jumping off the ground, Lin Nan brought the bulb close to his eyes and looked at it carefully, only to find that the tungsten filament inside was broken, no wonder it caused a "broken circuit".

I have the impression that this situation should only need to replace the bulb, but Lin Nan is not very sure, after all, this is his first time.

Casting a look at the forest wolf asking for help, but seeing that the forest wolf was expressionless and ignored him, Lin Nan thought for a while and was still firm in his thoughts.

He took the new bulb, stepped into his chair, aligned it and rotated it clockwise until he couldn't spin it.

Jumping off the chair, Lin Nan quickly ran to the switch, pressed it, and then looked at the light bulb on the ceiling with hope and longing.

Flash, flash, and then a steady, intense yellow light that looks so bright in late autumn.

Lin Nan smiled happily, the results obtained by doing it himself were so pleasant.

Lin Wolf also smiled, maybe just such a day of inspiration and guidance for Lin Nan's physics discipline is enough.

Walking to the table, Lin Wolf took the damaged light bulb and came to Lin Nan and told him to look at the light bulb.

After organizing the words in his mind, Lin Wolf said slowly: "You see, the exterior is a glass shell made of transparent glass, just to avoid filament glare, which is not good for the eyes. If you look closely, you can also see that the inside of the glass shell is coated or frosted to create diffuse reflection of light, resulting in excellent illumination. In order to enhance the luminous intensity in a certain direction, an aluminum reflective layer is also evaporated on the glass shell. As for the colorful illuminations you see outside, it's actually stained glass. The principle is the same, the tungsten filament inside is heated to a luminous state, but the effect caused by the different external glass is different. ”

"Look at the molybdenum bracket inside the bulb, the nickel electrode, the struts, the glass struts, the base, the spiral base, and the inert gases filled inside: nitrogen, argon, ......"

"Every part, every component, they have their own irreplaceable role, such as molybdenum bracket ......"

“......”

After twenty minutes of talking, the wolf's mouth was dry, and it seemed that the homework he had done in his previous life for teaching had not been forgotten until now.

Lin Nan on the side was stunned, he didn't come back to his senses for a long time, he felt that his worldview had changed a lot.

It turns out that a small light bulb, a light bulb that can be seen everywhere every day, contains such a big knowledge, although he can't fully understand what the wolf said, but he can understand a general idea.

Lin Nan was shocked and puzzled: When did my father become so knowledgeable?

What brought Lin Nan more was admiration and yearning: when I can talk like him, wouldn't it be cool!

Lin Wolf's teaching today is just a kind of guidance, so that Lin Nan himself is interested in learning, he hopes that Lin Nan in the process of learning is not only a simple cognitive calculation, but also a deep understanding and comprehension.

For example, if you see a car speed and power problem, a car, an engine, and even all its structures and relationships immediately appear in your mind, then this topic is no matter how you go around, no matter how difficult it is, it is not essentially different from 1+1=2 in your eyes.

Because, at this time, you are not doing a question, but doing a daily ordinary thing in life.

Of course, not everyone is Newton and Einstein, but Lin Wolf is confident that he can make Lin Nan's learning simple, fulfilling and meaningful, so that he can clearly understand what he is learning, so that learning can be regarded as a happy thing.

Live and learn.

This should be a habit, not a task.

Lin Wolf saw that Lin Nan was still putting the broken light bulb in front of his eyes and kept looking, making a kind of action to drop it, Lin Wolf hurriedly said: "I'm going to repair another lamp, your task has been completed today, if you want to break it to see if there is any inert gas in it, then I suggest you transfer this experimental site to an open space outside." ”

After saying that, Lin Wolf moved the chair to another room, Lin Nan didn't really run outside to drop the light bulb, but followed Lin Wolf to see the problem with the light bulb.

In the midst of the thunderstorm, the wolf repaired the flashing bulb.

Lin Nan didn't see it clearly, only saw that the wolf had it done in three or two clicks, and he couldn't help but ask curiously: "Dad, what's the problem with this bulb? Is it because the voltage is unstable and the contact is poor? Is there any difference between it and that bulb?"

Timber Wolf muttered in a low voice: "Dad just said such a long thing, now I'm tired and don't want to say it, you go home and check the computer yourself!"

Lin Nan was a little disappointed, but when he mentioned the computer, he became excited again, and in the third year of junior high school, his parents rarely let him play with the computer, for fear that he would be addicted to games.

Seeing the changing expressions on his son's face one after another, the wolf seemed to guess what he was thinking, and then said, "Dad will play games with you tomorrow!"

Lin Nan was even happier, "playing" is the nature of every child.

It was getting dark earlier and earlier in late autumn, Lin Wolf looked at his watch, and at 5:33, the sky was almost completely dark, and Ye Xinlan also returned home.

Seeing Lin Nan with a happy face, he asked with a smile: "Nan Nan, what did you play with your father in the afternoon?

Lin Nan replied: "Light bulb." ”

Ye Xinlan: "What?"

......

The afterglow of the setting sun shone in the Qingshui Lake of Nuoda, and there were many sprinkled on the courtyard of Linjiawan and the red tiles of the Lin Wolf's house.

From a distance, it seemed that the sunset was on the other side of Qingshui Lake, and the whole body slowly sank below the horizon until the last point was invisible, and the sky was completely dark.

On the dining table in the living room is the same meal as at noon, and the fragrant pot porridge is full of flavor, and you never get tired of eating it.

Once more fed and satisfied, the timber wolf walked to the gate and looked out at the night sky, where the brightest stars had begun to twinkle on the black curtain like shining diamonds.

Lin Wolf looked back and saw Ye Xinlan walking out of the kitchen after washing the dishes, and he shouted to his wife and son: "Go, follow me to a fun place!"

Lin Wolf took the two of them to the direction of the back mountain, Ye Xinlan seemed to have guessed the destination, showing a strange smile with a hint of shyness in anticipation, only Lin Nan was still in the dark.

Finally turned over this small mountain, Lin Nan saw the kind of scene that can only be seen in movies.

Lin Wolf smiled at Ye Xinlan and said, "Good luck." ”

I saw that there were square fields below, but there were countless "light bulbs" flashing on them.

Lin Nan excitedly shouted at his parents: "It's fireflies!

The fireflies scattered all over the mountains are like rows of colored lanterns scattered in the fields, and they are like a group of innocent children, cheering and jumping there.

Lin Nan stepped on the dirt and rushed down, rushing into the encirclement of fireflies, jumping and swaying with them.

The forest wolf also took Ye Xinlan's hand, walked step by step to the firefly swarm, and opened his hands, as if he was flying with them.

Looking at Lin Nan's cheerful appearance of jumping left and right, Lin Wolf swallowed the prepared knowledge of "Firefly Luminescence Chemical Principle" back into his mind, although knowledge is everywhere, but such a large group of flashing fireflies is really rare!

Let's change the topic, the forest wolf shouted loudly to Lin Nan in the light of fireflies: "Son, this is the place where I confess to your mother!"

The jumping Lin Nan stopped suddenly, glanced at the arrogant father, and then at the shy mother, and shouted loudly: "Dad, you are so romantic!"

After a while, the wolf shouted in a louder voice, "Wife, I love you!

Lin Nan also shouted in a louder voice: "Dad, I love you too! Mom, I love you too!"

......

In the light of the fireflies, only two men shouting unscrupulously, a man and a boy, as if they were crazy, and there was a woman enjoying the performance next to him, slim.

Unexpectedly, after a while, she also joined the ranks of the madmen.

In the empty mountains, I heard the voices of three people who were crazy and full of joy and happiness.

Firefly light, this 13th birthday gift Lin Nan likes very much.