Traditional power supply testing requires engineers to manually set the parameters of the DC electronic load for pull-load testing, manually record the output parameters of the power supply under different load conditions, and then the operator to judge whether the power supply is qualified according to the standard, which is extremely inefficient and seriously affects the engineer's test verification and product delivery cycle. Moreover, when the traditional electronic load measures the ripple of the switching power supply, it is necessary to use an oscilloscope and a current probe together, which is not only expensive, but also extremely complicated to connect.

Superconductors are conductors that have zero resistance and complete flux repulsion effects at a certain temperature. This characteristic sets them apart from all other conductive materials in that they do not lose energy or heat when current flows through them. If superconductors are used to make transformers, generators, motors, current limiters, and energy storage systems, efficient power grids and motors can be realized. Superconducting magnets made from superconducting coils can be used in magnetic resonance imaging and artificially controlled nuclear fusion and other fields. The antimagnetic properties of superconductors also make them an option for magnetic levitation trains.

In the new energy industry, the output of batteries and photovoltaic solar panels is DC, and the energy storage and power generation systems composed of them have a high proportion of DC power supply systems.

"Charging for 5 minutes, talking for two hours" is known to almost everyone, but how does the voltage and current of the battery of the mobile phone change within five minutes of charging the mobile phone, and how much electricity is charged to the battery within five minutes? Smart home appliances such as washing machines and refrigerators, what is the current change and power consumption in different function modes and when they are in standby? These questions actually just use a power meter will allow us to see the process and results clearly!

Hydrogen energy, as an important way of efficient and clean production and utilization of electric energy, is steadily advancing in my country, and its application scenarios continue to expand. In the "Action Plan for Carbon Peaking Before 2030" issued by the State Council, 11 items involve the field of hydrogen energy, which points out the way in many aspects such as transportation application, technological research and development and innovation. In 2021, hydrogen energy will grow rapidly in the field of commercial vehicles, especially heavy trucks, and more than 1,000 hydrogen energy vehicles will be demonstrated in the Beijing Winter Olympics, basically all of which are passenger vehicles, covering buses and group shuttles.

What is a starter motor ? A starter (also self-starter, cranking motor, or starter motor) is a device used to rotate (crank) an internal-combustion engine so as to initiate the engine's operation under its own power. Starters can be electric, pneumatic, or hydraulic. The starter motor can effectively reduce manpower requirements, and is more rapid and reusable. It is often used in the start of automobile engines and the start of large construction machinery.