Sun Yi returned to his shack and found that the previous meal had been prepared, still porridge and flatbread, and everyone was waiting for Sun Yi to come back and start the meal. Pen, fun, pavilion www. biquge。 info

Stuffy moved his shack to the neighborhood in the morning, and at this time he was busy helping to serve food, and he proudly pointed to a plate of wild vegetables on the ground: "Look, this is called big green leaves, which can be eaten as vegetables, and can also be dyed blue. ”

Sun Yiyi pursed his lips one by one, "Eating this won't stain your teeth blue, right?" ”

The stuffy guy looks down on Lord Lidel for being so ignorant, "It's so easy for Ye to dye colors!" ”

After speaking, he took a big mouthful of big green leaves and chewed it, and deliberately bared his teeth to let Sun take a look.

Because there were no outsiders, Sun Yi wanted to call the baby to eat together, and found that the orphan pomegranate he met in the morning was following the baby.

The milk baby explained: "Master, Pomegranate is a girl. ”

Sun Yi was taken aback.

The milk baby said that Ha Laocai led the children to take a bath, and the children sweated all morning, and they all jumped into the water, but the little pomegranate refused to live or die, and it was useless to persuade them. In the end, Ha Laocai pulled the pomegranate aside and talked alone for a long time, only to know that the pomegranate was actually a girl.

Ha Laocai didn't know what to do, so he had to send the pomegranate to Lord Lidel.

The baby sighed: "Alas, I really don't know how she survived." ”

In these years, if it is a boy, the family will still leave a stutter, and if it is a girl, I am afraid that she will be abandoned by her parents a long time ago.

The little pomegranate hid behind the milk baby, and said in a small voice: "Please, don't drive me away, I will work, I eat less!" ”

Where can Sun Yi stand this, "Pomegranate won't go!" I'm going to eat here with my baby sister! ”

Several people squatted down around the wild vegetables, divided the dishes and chopsticks, and served porridge.

The pomegranate really drank only half a bowl of porridge and stopped eating.

Sun Yi felt pain in his heart, and personally filled a big bowl of pomegranates, so he had to watch the pomegranates drink it with his own eyes.

At the beginning, Sun Yi kept saying, "Drink more, drink more",

Later, before I knew it, it became "drink slower, drink slower".

Finally, seeing that the pomegranate drank a big bowl of multigrain porridge in one go, Sun Yi sighed, but said to the milk baby: "You are not busy these days, if you have time, make us a table and chairs!" ”。

Saying that, Sun kept getting up, grabbed a few chopsticks and wild vegetables, and stood aside to eat.

Soon solved the previous meal, Sun Yi'an sent the baby out to borrow a bowl from the people, and brought a pomegranate to help himself, and he was going to make a volt battery pack.

Sun Yi first melted a pot of thick salt water and filled half a bowl in all the bowls he could find.

Sun repeatedly bent the tin foil on each tin foil copper coin string into a U-shape and buckled it in salt water.

Theoretically, that's a battery. The highly active tin will become the negative electrode of the battery, while the inert copper coin will become the positive electrode, and the current should flow continuously from the positive electrode to the negative electrode through a bridge made of tin foil.

However, Sun Yi, who has worked for so many years, knows that theory is theory, and practice is practice.

The copper coin in front of me is not pure copper, and the tin foil is not pure tin.

Ancient copper was divided into red copper, brass, bronze, white copper, and so on. Red copper is pure copper, brass is a copper-zinc alloy, and bronze is a copper-tin alloy. The copper used to cast copper coins may be any kind of copper, and may even be mixed with more miscellaneous elements such as iron and lead.

Tin from the Ming Dynasty was inevitably mixed with lead.

If we sort the metal in terms of its activity, zinc is greater than iron, iron is greater than tin, tin is slightly larger than lead, and lead is greater than copper. Therefore, if the main component of copper coins is brass, that is, copper-zinc alloy, and zinc is more active than tin, it is difficult to say which is the positive electrode.

These copper coins have been picked again, and the blacksmith master has picked them again, and Sun Yi can only conservatively think that it is just some inferior money that contains too much iron and lead. The specific composition depends on the test to distinguish it.

In the case of pure tin and pure copper, corrosion should be formed at the part where the tin foil is submerged in the salt water, and bubbles should be formed at the part of the copper coin.

Sun Yi asked the pomegranate to pay attention to the observation, if the bubbles are formed on the tin foil, then the copper coins must be brass with more zinc, and these copper coins can not be used first.

If the bubble is formed on a copper coin, also observe whether the corrosion is occurring on the tin foil.

Some copper coins are mixed with zinc, tin, and less composition, and they are both positive and negative, and bubbles are gathered on the copper coins, and corrosion also occurs on the copper coins, and there is no need for the participation of tin foil at all. None of these coins can be used.

Sun Yi himself took out the USB cable of the power bank and carefully used a knife to cut a section of the outer skin at both ends of the cable.

The standard USB cable is 4 cables, the red and black ones are the power cables, and the white and green cables are the data cables. The data cable was useless to Sun Yi, and Sun Yi cut the data cable at both ends and carefully pulled it out. The copper in these two wires is the electrolytic pure copper containing 99.99% copper that Sun Yi can trust.

Turning out the car charger of the power bank, Sun Yi used a knife to pry the shell off, revealing the circuit board inside. This charger can be plugged into the cigarette lighter of the car and provides two USB power outputs, one can charge the mobile phone and the other can charge the PAD. The charger has three LED indicators, green means it's plugged in, yellow means it's charging your phone, and red means it's charging your PAD.

Sun Yi needed a light-emitting diode. He burned the wire red in a charcoal fire and carefully soldered the red light-emitting tube to its protective resistor. The working voltage of this ordinary red diode is 1.6~1.8 volts, and the rated current only needs 20 mA. Sun Yi intends to use it as a measuring tool.

After doing all this work, the pomegranate also finished picking the copper coin.

Not to mention that it is quite appropriate for the little girl to do this, patient and careful, and effortless.

Sun Yiyi put together the qualified copper coins, which should be pure copper casting. Sun Yi found that these pure copper coins were not only reddish in color, but also minted in previous dynasties.

This time, Sun crossed two bowls with each money string to form a battery pack in series.

When the seven or eight bowls were connected, Sun Yi connected the light-emitting diode with a wire.

No response.

Sun Yi took off the diode and put the two wires on the tip of his tongue.

A sour sensation passed through the tongue, and there was electricity!

It was discovered by a physicist named Ritter. Ritter connected electricity to his tongue, eyes, nostrils, and ears to feel it. He discovered that electricity can stimulate taste buds to produce taste, stimulate the optic nerve to produce color, and when he connects electricity to his tintin, he excitedly announces that he will not be married in the future!

Chinese rickshaw drivers actually do the same! In the old days, it was popular for the poor to drink with rusty iron nails. Take a sip of wine, take a sip of iron nails, and you can drink half a catty without vegetables! If you can dip the nail in salt water, the taste will be even more beautiful. In fact, the principle is that the iron nail and rust form a battery, which will feel delicious in the mouth, and the salt water can increase the current of the iron nail battery.

As soon as there was electricity, Sun Yi continued to connect in series.

The baby kept borrowing back bowls, and the number of volt batteries in series continued to increase.

At the eighteenth bowl, the red light-emitting diode finally lit up.

Sun Yi calculated with his toes, and the average voltage of each bowl was 0.1 volts.

Sun Yi decided to connect a hundred bowls in series! Two sets of U-shaped money strings are used to cross each of the two bowls.

But the baby is bitter, and he moves the bowl back and forth.

The matter of the baby borrowing the bowl actually alarmed Wang Erniu. There were less than 500 people in the camp, and there were only more than 100 rice bowls, and the average family took turns using one or two bowls.

By the time the array of 100 bowls was set, it was already afternoon.

Little Pomegranate took a chopstick and carefully stirred the salt water in each bowl. Voltaic batteries have this problem, and after a period of time, they will accumulate a bubble layer at the positive electrode, hindering the formation of current.

Sun Yi connected two wires to the input of the car charger.

For general car chargers, the input voltage is 9~30 volts.

The charger's green indicator light is on!

Sun Yi connected the power bank to the car charger through a USB cable.

Nothing happened.

However, Sun Yi was very satisfied.

The voltage is enough, the current is too weak.

As expected, the next step is to figure out how to increase the current!

But that's tomorrow, and we can't delay the people from having dinner today.