Looking at the markings of any modern battery, whether it’s a lithium-ion cell phone battery or a lead-acid battery from an uninterruptible power supply, we can always find there information not only about the rated voltage of this power source, but also about its electric capacity.

Typically, these are numbers like: 2200 mAh (read as 2200 milliampere-hours), 4Ah (4 ampere-hours), etc. As you can see, a non-system unit of measurement - Ah (Ampere hour) - “ampere- hour ", and not at all" farad "as for capacitors. And the clock here does not appear for a reason, but for the reason that a regular battery, unlike a conventional capacitor, is able to power the load literally for hours. If you try to explain very simply, then the battery capacity in ampere-hours is a numerical expression of how long this battery is ...

Previously, a circuit with a step-down (or step-up, or multi-winding) transformer, a diode bridge, and a filter for smoothing ripples was used to power devices. For stabilization, linear circuits were used on parametric or integrated stabilizers. The main drawback was the low efficiency and high weight and dimensions of powerful power supplies.

All modern household electrical appliances use switching power supplies (UPS, UPS - the same thing). Most of these power supplies use a PWM controller as the main control element. In this article we will consider its structure and purpose. A PWM controller is a device that contains a number of circuitry solutions for managing power keys. At the same time, control is based on information obtained through feedback circuits for current or voltage ...

A wide range of products in different price ranges is presented on the market of LED lamps and fixtures. The main difference between devices of low and medium price segments is to a greater extent not in the LEDs used, but in the power sources for them. LEDs operate from direct current, and not from the alternating current that flows in the household electrical network, and the reliability of the lamps and the mode of operation of the LEDs are more dependent on the quality of the converter.

In this article, we will look at how to protect LED lamps and extend the life of low-cost models. Everything described below is true for luminaires and lamps. The cheapest LED products use a blanking capacitor as a power source. The principle of its operation is based on the reactance of a capacitor. In simple words, the capacitor in an AC circuit is an analogue of a resistor.Hence the same disadvantages follow. ...

Technology for enhancing comfort is now called smart. They touched almost all spheres of life. In stores you can find smart kettles, crock-pots, light bulbs and even door locks. They will be discussed in the article. Special attention is paid to this topic, because the safety of your property, and possibly personal safety, depends on the quality and reliability of the castle. Locks come in various designs, both as a stand-alone device and as a superstructure over a conventional mechanical lock.

Z-wave Dana Lock fits most doors. Works in conjunction with a Z-wave controller or Z-wave gateway, except for which it is compatible with Fibaro Home Center 2 and Home Center lite controllers. It is installed instead of the core of the old castle, the mechanism remains the same.There is a video on the network about the installation process of this system.In addition to the lock, a number of products are included in the Z-wave smart home system, for example, a common controller Fibaro Home Center interacts with all connected...

Lighting the workplace is an important condition for the productive implementation of tasks. The proper level of illumination is created by local light sources, which include table lamps. The comfort of its use depends on the choice of this light source. On the modern market there is a wide range of both decorative and functional lamps from simple to complex devices with a wide range of additional functions.

Table lamps can be divided into two types: decorative and for working lighting. Decorative table lamps are used to create a subdued uniform light in the room. For this, translucent diffuser shades or lampshades of glass, plastic or fabric are used. Such lamps complement design decisions in the interior and for the most part are not suitable for lighting a workplace. Table lamps create a directional beam...

Growing vegetables in a greenhouse requires special attention to all the nuances and conditions. A significant role is played by the temperature of the soil and the environment. Frost is especially dangerous for plants, and if the temperature of the soil drops below the recommended norm, then the seedlings can disappear altogether. Therefore, you need to equip the soil heating system. One of the possible options is heating the greenhouses and soil with a heating cable.

Heating the soil with a cable will help to achieve a larger crop than without it.The optimum temperature is considered to be at the level of 15-25 degrees Celsius. To achieve this temperature, it is necessary to spend 75-100 W / m. In this case, the specified parameters should not be exceeded, since overheating of the root system as well as hypothermia is dangerous. To save the cable, it should be laid only in those places where plants will grow. Warming the soil under paths and walkways is simply meaningless ...

For electricity, you need to pay, as well as for any other resources and services. In order not to let yourself be deceived when paying, you need to learn how to calculate its expense. There are special devices for this, for example, an individual meter, which is installed in each house or apartment. However, it shows the total consumption, and how to calculate the electricity consumption by a separate device we will describe in this article.

The main characteristics of electrical appliances are voltage, current and power. At the same time, either all three parameters, or in a selective manner, can be indicated on the case or in the instrument passport. In Russia and neighboring countries, electrical appliances are used that are designed for a voltage of 220 V AC, in America, for comparison, there may be a voltage of 110 or 120 V. In the passport of the device, depending on the particular case, in explicit form, the power may not be indicated at all, but the electricity consumption ...

Stepper motors are used to control the position of something, or to rotate the working unit at a given speed and angle. Such features made it possible to use it in robotics, numerically controlled machines (CNC), and other automation systems. In this article, we will consider a number of issues related to the construction of stepper motors and how to control them using the Arduino microcontroller.

All electric motors used in practice operate due to electrodynamic phenomena and processes occurring in the magnetic fields of rotors and stators.As we have already mentioned, any engine consists of at least two parts - mobile (rotor) and motionless (stator). For its rotation, it is necessary that the magnetic field also rotates. The rotor field rotates after the stator field. In principle, such basic information is enough to understand the general picture of the operation of electric motors ...