Small inventions need the support of the majority of netizens

You might consider using hollow shoes with water in them and heating them with a heating wire. Because the specific heat of water is relatively large, so use water. And you can also use a switch.

It is best to use the last temperature regulating resistor. It's some thermistors. When the temperature is low, it will automatically power off and turn it on again.

How's this idea?

A: Yes, yes, yes.

1.How much to heat to the temperature range to be comfortable to be comfortable.

2.How to control the temperature can not go up all the time.

3.How much energy is needed to complete the output of these heats.

4.What can be used to accomplish the output of these energies.

For what you said:1You can look into the heating elements and temperature controllers of electric blankets.

2.See if the power of heating will exceed the rated power of the dry battery, and if it does, you will have to come a few more or choose a higher power battery.

3.In order to ensure that the energy of the battery is converted into heat and transmitted to the human body as much as possible, it is necessary to make the insulation of the insole to the ground high, otherwise it will be wasted if it is all transmitted to the ground.

4.Safety issues, dry battery batteries should be very safe, the key is where to put it, after all, it has to bear the weight of the human body.

Halo, heating requires a lot of electricity.

For example, (it heats up quickly) at least 200 watts.

Your 100 batteries are not enough.

Just think about it.

Why don't you buy a pair of similar shoes, and I'll have them.

1.We know that usually we will find some old batteries in our drawers, but we don't know if there is any power left, and it is troublesome to check it if we put it in and there is no way to know how much power is left. So, you can make a small electroscope.

The method is as simple as this: use a small light bulb, a very small one (like the one on a pendant or toy lamp, which is sold in hardware stores). Then connect two thin enameled wires to the lamp separately.

The other end of the two wires is used to connect the positive and negative poles of the battery you want to inspect. According to the brightness of the small bulb, you can judge the battery level.

2.Take a broken umbrella, remove the cloth, take a wire, connect one end to the TV or radio, and the other end to the umbrella, it is a good signal receiver. If you want to be professional, just wrap a few more wires around the umbrella.

It's the most cost-effective, quickest way, and just a little hilarious.

3Put a match and a large needle together with a quilt, wrap them tightly with the aluminum foil of the cigarette pack, and then bend the aluminum foil at the end of the match head to seal and twist tightly. Then attach a directional tail near the tail and pull the needle out, and it becomes a very simple recoil rocket.

During the experiment, a small rocket was placed on a wire stand, a match was lit, and the part of the aluminum foil tube wrapped in the match head was heated. When the temperature rises to the ignition point of the match head, the matchbox in the foil is ignited, causing the surrounding air to expand dramatically, and the gas is ejected from the tail mouth at high speed. As a result of the recoil, the bazooka flew forward from the rack.

If you wrap two head-to-head matches in aluminum foil, leave them unclosed at both ends. Place it on top and heat it from the middle. When the match in the barrel is lit, the gas is ejected from both ends, and the foil cylinder remains on the rack, thus indicating the conservation of momentum in the system.

Homemade soap paper.

Materials and tools for crafting:

Hygroscopic white paper, small pieces of soap, a brush and disposable beverage cans.

Production method: first chop the soap and put it in the jar, put the cup on the stove after filling the appropriate amount of water, wait for the soap to melt, cut the white paper into the size of a matchbox, apply the soap liquid one by one, and then take it out to dry it to become soap paper.

Homemade hot air balloons.

1.First of all, we cut 6 to 8 leaf-shaped pieces of paper out of soft paper.

2.Fold them in half and glue their edges together to make a balloon.

3.Tape the four wires to the bottom of the balloon. Attach the other end of the thread to the table with plasticine.

4.Try to turn the speed of the hair dryer as slowly as possible. Aim the blower up at the bottom opening and turn the switch on. The balloon will slowly grow larger, tighten the string, and leave the table.

Homemade flashlight.

The specific method of making it is to remove one end of the lid of a waste can (such as a Lulu beverage can) and knock the other end with a round hammer. Roll up two No. 1 batteries with thick corrugated cardboard and put them into the tank with the positive electrode facing up and the negative electrode facing down.

Find a suitable plastic lid (such as a magic big roll lid that can be fastened to Lulu cans) and dig a small circular hole in the lid** in such a size that the bulb is plugged in tightly. Insert the base of the bulb into the small hole. Take a piece of wire hunt and peel off the wire skin at both ends, wrap one end around the lamp base, and pierce a small hole through the side of the plastic cover with the other end.

Place the plastic lid over the can. Check that the bulb and battery are in close contact. At this point, the Clan-destroying Flashlight is ready.

When using, use your thumb to press the wire from the sidewall on the weld that is not painted from the can, the flashlight will glow, and the thumb will jump off the wire, and the flashlight will go out, which is very convenient to use.