Nowadays, there are many types of wires sold in the market, and some inferior products are mixed in them, which seriously affects our electricity safety and has buried our lives with long-term hidden dangers. Identification of the advantages and disadvantages of wires can be distinguished from the copper core material, the cross-sectional area of ​​the copper core, and the packaging and printing of the wires.
The copper core material of high-quality electric wire is a high-quality copper material with high purity and good electrical conductivity as a copper core material, and has a very good metallic luster. The inferior metallic wire has a poor metallic luster and can be clearly distinguished with the naked eye. The copper used for poor quality copper wire core material has high impurity content, high resistance, poor electrical conductivity, large power loss on the power line, and serious heat generation on the wire, which can not ensure the safety of use, and can easily cause damage to household appliances due to short-circuits. The more serious is that Poor wires can easily cause fire and seriously endanger the safety of our lives and property.
The cross-sectional area of ​​the high quality wire copper core is strictly in accordance with national electrical standards to ensure its safe use at rated current strength and rated voltage. In order to reduce the production cost of inferior quality wires, the cross-sectional area of ​​its copper core does not meet the national electrician standard, and its actual rated current intensity and rated voltage are not achieved in practical use. Such wires can easily cause damage to electrical circuits when you use high-power appliances.
The cats on the Qituan Qijia Forum paid special visits to the hardware business. The following are the three methods used to illustrate the authentic identification of the panda wire.
First of all, the most intuitive is to look at the packaging of security stickers, the latest Panda wire stickers must be taken like me, white ground, green words, and there must be anti-counterfeiting phone, we must remember that the authentic panda wire anti-counterfeiting phone above one The telephone of the coiled wire shall prevail. This year's security telephones are fake, so be sure to look for the latest anti-counterfeiting calls for Panda Wire! Otherwise, it would be useless to buy counterfeit counterfeit telephones.
The second method of identification is:
Every panda on the authentic panda core line has a panda's seal on every single meter. It has the English brand logo and the like, instead of being printed, it can be touched by hand.
The third way to identify the panda wire: look at the copper core of the wire. I do not know whether it is the price of raw materials, it is said that the price of wire is very high, and relatively counterfeit manufacturers will also take more time counterfeit materials in order to achieve the purpose of maximizing profits.
In fact, there are many kinds of copper cores for electric wires, and the conductivity and hardness of different copper are different. For example, the copper wire of the red wire in the figure above is brass. Brass is a copper and zinc alloy. The hardness is good, but the conductivity is not. The copper wire of the blue wire is copper. The price of this material is yellow. Copper is higher, more conductive, and softer. It is an excellent raw material for making high-quality wires.
When buying a wire, you can bend the wires randomly. It's best to look carefully at the copper material. Also look at the cross-section. The insulation is thick and uniform. The copper core is exactly in the middle of the cross section. It is a qualified and safe domestic wire.
So how do we distinguish between genuine and false? Continue below to explain.
Looking at the cross section is a good way to distinguish the wires. Some points to look at for weak wires include:
1, copper thickness
2, copper core location
3, the density of aluminum wire
4, the extent of tin foil package
5, the degree of toughness of the skin
To put it bluntly, it is to look at a material and workmanship. The counterfeit goods are fakes. It is impossible to be the same as the genuine craftsmanship. Therefore, if you look closely at the craftsmanship, you will find many clues. It's best to tear the wires apart so that you can see more clearly.
Common weak wires include: closed routes, network lines, telephone lines, audio lines, AV lines, VGA lines, audio lines, and so on. As for the authenticity of the weak wires, the method of distinguishing them from the strong wires is similar. The plastic texture of the skin must first be considered.
After folding the wire and restoring it to its original shape, the poor quality wire will leave a crease that cannot disappear, which is very obvious, but the high-quality wires will not have such a phenomenon. This picture is a comparison chart after the true and false wires are bent. Obviously, the following is a false wire.
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The cover glass is covered on the material on the glass slide, which can avoid the contact between the liquid and the objective lens, so as not to contaminate the lens, and can make the top of the observed cells in the same plane, that is, the distance from the objective lens is the same, so that the observed Images are clearer.Why do you need a coverslip when using a microscope
1. Make the object to be observed form a thin film, which is easy to transmit light and easy to observe;2. Make the specimen relatively fixed;
3. It is convenient to use the capillary phenomenon to form a gradient when adding various reagents (staining agent, acid, salt solution);
4. Avoid contamination of the specimen.
The purpose of staining the specimen with iodine solution is to make the cells more obvious under the microscope, and it can also kill the cells and prevent the cells from migrating.
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