Donner lay on the bed, staring blankly at the roof, he had no hope of finding the copper wire to charge the phone.

His mind was a mess, constantly searching and remembering what he had learned in the past, trying to find the right product, and then get it out of the current predicament.

"Squeak!"

The wooden door was pushed open, and Anna walked into the wooden house: "Brother Donner, I heard that you are looking for golden wire, I found it, do you need it?"

"Yes!" Donner replied casually, then stunned for a moment, and stood up suddenly: "What did you just say, you found the golden thread?"

"Yes, Brother Donner, you see, is this okay?" Anna showed a shallow smile on her face, hiding the sadness that had just faded, and she was actually very happy that she could help Brother Donner.

Donner stared at a roll of golden wire in Anna's hand, hurriedly took it from Anna's hand, and carefully looked at the material, it was really gold wire.

Donner was pleasantly surprised, and couldn't help but hug Anna and kiss her on the forehead, such a gesture is very common for Donner, he used to do these intimate gestures to his girlfriend when he was happy.

Although this world is no more protective of men and women than in ancient feudal society, and it is important to pay attention to whether a man or a woman is intimate or not, the atmosphere of this society is not to the extent that a girl can be kissed casually.

Anna's face was flushed with shame, it was already red to the base of her ears, she lowered her head, her heart beat faster, and it seemed as if there was a deer bouncing around.

And Donner only noticed Anna's strangeness at this time, and he touched his nose a little embarrassed: "Eh...... That one...... Just ......"

"Anna, where did you get this golden thread?" Donner didn't know what to say, and tried to change the subject.

Anna shyly glanced up at Donner's delicate face, he would have been more handsome if it weren't for the scar left by the slave mark! Anna said like a mosquito: "This is what my mother left me." ”

Donner was silent for a moment, he knew that Anna's mother was long gone, and this must have been removed from some of the jewelry relics that her mother had left Anna, and its importance was self-evident.

But at the moment, this golden wire is indispensable for Donner, and it can even be said that it is also very important for the subsequent survival and development of Crescent Island, so he is a little hesitant.

Although Anna was innocent, she also saw the hesitation in Donner's heart, and she smiled sweetly: "Brother Donner, I'm glad that Anna can help you, I'll leave first." ”

Anna lifted the hem of her skirt and bent her knees, and then left the hut with a blush on her face that had not yet dissipated from shyness.

Donner looked at the weak back of Anna's departure, opened his mouth, and finally didn't say much, many things, such as promises, just remember in his heart.

Donner looked at the warm gold wire in his hand, okay, now that the gold wire and magnet are there, it's time to get down to business.

The production of a hand-cranked small generator is actually very simple, this kind of experiment was done in junior high school physics class, which is nothing more than to let the copper coil rotate in the magnetic field and cut the magnetic inductance line to generate an electric current.

Downer does not have copper wire, but he does have gold wire, which conducts electricity better than copper wire.

First of all, find a bamboo pole, process the block magnet into a U-shaped body of appropriate size, and place it in the inner bamboo tube. Then wrap the gold wire around the iron rod, pass through the middle of the two magnets, and leave two gold wires at the end to pull it out, and the two gold wires are used to link the mobile phone battery.

It's crude, but as long as it works, it's fine. The hand-cranked engine is no different from other power generators, both of which cut magnetic inductance lines to generate current, but the hand-cranked engine is just manpower.

The power of manpower is generally 0.1 to 0.2 horsepower, which is about 70 to 130 watts. This kind of power generator can actually be used as an emergency power supply to charge some small electrical appliances or batteries.

I remember when I was a child, a group of people in the village watched the legend of the new white lady around the only TV set at night, and then there was a sudden power outage, so I used a bicycle to drive a small generator without oil, and several young people took turns to pedal it, and I just watched a few episodes of TV.

Donner remembers this incident very deeply, when he was a child, he didn't understand the truth, and later when he went to school, he learned the mystery inside, and now he thinks it's quite funny.

Ay!

Thinking of this, Donner has the appearance of his relatives in his mind, and he doesn't know if they are doing well, maybe his disappearance makes his family very sad!

It's been a year, and maybe I'll never be able to go back.

With some emotion in his heart, Donner took out his phone and removed the battery. To be honest, fortunately, his mobile phone was bought two years ago, and the battery can be removed.

Then now there is an electromagnetic copper wire, and he is completely blind when he gets a hand-cranked generator, and he must know that the precision of the charging interface is enough to make him desperate.

Donner fixed the ends of the gold wire to the metal sheets of the positive and negative electrodes of the battery, then grabbed the crank and began to turn the bamboo tube.

The bamboo tube began to turn, Donner felt a little uneasy in his heart, he was a little bottomless in his heart, after all, this is a magical world where magic exists, what if there are really gods in this world and change the basic physical laws of this world?

Saltpeter ice, nitrate, sulfur and carbon mixed in proportion will explode, sulfuric acid appears, etc., these can not really represent anything, what if cutting the magnetic inductance line can not produce current, what to do?

The bamboo tube kept turning, and Donner worshiped all the gods and Buddhas in his heart, even the goddess of holy light in this world, her old man, did not let go, and his only prayer was that he could send electricity.

Shaking the homemade hand-cranked generator intermittently, Donner was worried that the power charged in it was not enough, so he continued to shake it for another hour.

With apprehension, Donner took off the battery, carefully installed it in the phone, and bowed to the phone with his hands folded: "Please, Addison, Faraday, Einstein...... Gods bless. ”

After worshipping the scientists again, Donner took a deep breath and pressed the power button.

One second, two seconds...... A minute passed.

Why didn't he react, Donner stared at the phone, could it be that the electricity was not charged enough, or that the power was not generated? Or was the phone broken? After all, the more sophisticated the instrument, the easier it was to be damaged, and Donner had no bottom in his heart.

But...... If it's the latter two cases, then it's a cheat. Then, Donner patted his head, how could he forget about this, and he had to press and hold his phone for a few seconds when it was turned on.

Donner continues to press the power button, press and hold for five seconds, and then ...... The phone screen lit up.

A brand logo appeared on the screen, and Donner was relaxed for a while, holding back his excitement, and for the first time, he thought that this icon was really good-looking.

The phone screen returns to the home screen, and one app after another appears in front of you, but now these apps are useless.

Looking at the upper right corner of the phone, there is no signal, no network, and only a ten percent battery sign appears on it.

There's very little power, but you don't have to worry about it anymore.