Wires and cords. High resistance wires. Scheme, description

ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
Free library / Electrician

Wires and cords. High resistance wires. Encyclopedia of radio electronics and electrical engineering

Free technical library

Encyclopedia of radio electronics and electrical engineering / Electrical materials

High resistance wires are designed for the manufacture of resistors, shunts, spirals, heating devices. The main parameters of wires from manganin, constantan and nichrome are given in table. 1.44.

Table 1.44. Resistance of 1 m high resistance wire, Ohm

High resistance wires

Author: Koryakin-Chernyak S.L.

See other articles Section Electrical materials.

Read and write useful comments on this article.

<< Back

Latest news of science and technology, new electronics:

Air trap for insects 01.05.2024

Agriculture is one of the key sectors of the economy, and pest control is an integral part of this process. A team of scientists from the Indian Council of Agricultural Research-Central Potato Research Institute (ICAR-CPRI), Shimla, has come up with an innovative solution to this problem - a wind-powered insect air trap. This device addresses the shortcomings of traditional pest control methods by providing real-time insect population data. The trap is powered entirely by wind energy, making it an environmentally friendly solution that requires no power. Its unique design allows monitoring of both harmful and beneficial insects, providing a complete overview of the population in any agricultural area. “By assessing target pests at the right time, we can take necessary measures to control both pests and diseases,” says Kapil ... >>

The threat of space debris to the Earth's magnetic field 01.05.2024

More and more often we hear about an increase in the amount of space debris surrounding our planet. However, it is not only active satellites and spacecraft that contribute to this problem, but also debris from old missions. The growing number of satellites launched by companies like SpaceX creates not only opportunities for the development of the Internet, but also serious threats to space security. Experts are now turning their attention to the potential implications for the Earth's magnetic field. Dr. Jonathan McDowell of the Harvard-Smithsonian Center for Astrophysics emphasizes that companies are rapidly deploying satellite constellations, and the number of satellites could grow to 100 in the next decade. The rapid development of these cosmic armadas of satellites can lead to contamination of the Earth's plasma environment with dangerous debris and a threat to the stability of the magnetosphere. Metal debris from used rockets can disrupt the ionosphere and magnetosphere. Both of these systems play a key role in protecting the atmosphere and maintaining ... >>

Solidification of bulk substances 30.04.2024

There are quite a few mysteries in the world of science, and one of them is the strange behavior of bulk materials. They may behave like a solid but suddenly turn into a flowing liquid. This phenomenon has attracted the attention of many researchers, and we may finally be getting closer to solving this mystery. Imagine sand in an hourglass. It usually flows freely, but in some cases its particles begin to get stuck, turning from a liquid to a solid. This transition has important implications for many areas, from drug production to construction. Researchers from the USA have attempted to describe this phenomenon and come closer to understanding it. In the study, the scientists conducted simulations in the laboratory using data from bags of polystyrene beads. They found that the vibrations within these sets had specific frequencies, meaning that only certain types of vibrations could travel through the material. Received ... >>

Random news from the Archive

Honeywell HPMA115S0 - PM2.5 Dust Meter 29.05.2019

Honeywell has introduced a new HPMA115S0 dust mass meter that measures airborne fine particulate matter as small as 2,5 microns. The HPMA115S0 is designed to be integrated into portable and fixed air quality instruments. The 43mm x 36mm x 24mm 5V 80mA device uses an integrated fan to draw air through an internal chamber where a laser-photodiode pair counts and analyzes dust particles, and an onboard microcontroller translates this information into dust mass concentration. in the air.

Within a single information package, accessible through the UART interface, there is separate information on the concentration of particles smaller than 2,5 microns (PM2.5, smoke particles or bacteria) and particles smaller than 10 microns in diameter (PM10, dust, pollen or mold) .

The sensor has the following technical characteristics:

Operating time 20000 hours, which is equivalent to 7 years of operation at a load of 8 hours a day.
Measurement time 6 seconds.
Measurement range from 0 to 1000 µg/m3.
Accuracy +- 15 µg/m3 in the range from 0 to 100 µg/m3 and +- 15% in the range from 100 to 1000 µg/m3.
Operating temperature range -10 °C to 50 °C.
Electromagnetic compatibility in accordance with the IEC61000 group of standards.

The presence of UART with 3,3 V levels makes it possible to connect to an external microcontroller without signal level conversion. It is possible to transfer the device to low power consumption mode with the built-in fan turned off and the current consumption reduced to 20 mA.

It may also be important for the developer to have a built-in stabilizer on board the device that converts the supply voltage of 5 V into an output voltage of 3,3 V, which can be used to power an external circuit, for example, controls or indications.

The Honeywell HPMA115S0 dust meter can be used with the following devices:

Air conditioners and air purifiers.
Portable air quality meters.
Integrated environment monitors.
Car air purifiers.

The Honeywell HPMA115S0 module is calibration free, RoHS compliant and REACH compliant.

Other interesting news:

▪ External optical drives Buffalo BRXL-PC6VU2-C

▪ M25P64 serial flash chip

▪ Coffee after a day's work is bad for sleep

▪ Footprint of the wooden Stonehenge

▪ Altruism relieves stress

News feed of science and technology, new electronics

Interesting materials of the Free Technical Library:

▪ section of the site Radioelectronics and electrical engineering. Article selection

▪ article Mole history. Popular expression

▪ article Why is the curiosity of automatic spelling called the Cupertino effect? Detailed answer

▪ article by Schizander. Legends, cultivation, methods of application

▪ article A simple radio warning system. Encyclopedia of radio electronics and electrical engineering

▪ article Electric spoon. physical experiment

Leave your comment on this article:

All languages of this page

Home page | Library | Articles | Website map | Site Reviews