Science and technology small production electronics is simple, to be original, no flashlight, hot

Candles in water.

Materials: candles, water cups, water, iron blocks.

Procedure: Light the candle, fix the candle to the bottom of the cup with candle oil, and fill the cup with water until the water is about to bury the candle. When the candle burns out, you will get an unexpected surprise.

I connect them with feathers one by one (glue them up).

Is this easy? As long as two cylindrical high-strength magnets and a piece of copper wire can make a small motor that can rotate quickly.

Please see the details in the post bar:

Small scientific and technological productions must have a certain scientific content. So I suggest you do a simple electroscope:

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.

Homemade soap paper Crafting materials and tools: Hygroscopic white paper, small pieces of soap, a brush and disposable beverage cans. Directions:

First, chop the soap and put it in a jar, put the cup on the stove after filling it with an 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 Balloon 1First 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.

Take an unopened can, cone a hole in the eccentricity of the bottom and the wall of the can on the same side, and pour out the drink. Tie the can to half a metal soap dish with two wires, and put a small metal lid (such as a balsam box) in the box, and put alcohol cotton in it, as shown in the picture.

During the experiment, inject 1 4 cans of water from the side holes, and block the side holes first. Float the soapbox on the water, like a boat. Ignite the cotton alcohol to boil the water, steam erupts from the bottom hole, and the boat moves forward.

Hello, I feel syringes. Life-saving, very practical, the current level of science and technology is also very simple, the needle has scientific and technological content, I don't know what your school has to do with this, I'm curious, I hope it can help you, thank you.

Take a magnet and add a nail, and the compass or compass is done.