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Как отличить источник питания переменного и постоянного тока
Автор：Модуль питания ZYG Time： 2023-4-20
In the world of electronics, power supply is a critical component that ensures the smooth functioning of the device. The two most common types of power supply are AC and DC. Although both types of power supply serve the same purpose, they differ significantly in terms of their properties and applications. In this article, we will discuss how to differentiate between an AC and DC power supply.
AC Power Supply
AC stands for Alternating Current, which indicates that the flow of electrons constantly changes direction. AC power is the type of electrical energy commonly used in homes, offices, and industries. The primary source of AC power is the electrical grid that delivers power to our homes and businesses. AC power is used to power appliances, lights, and machines that require a continuous supply of power.
AC power supply can be differentiated from DC power supply by the waveform of the voltage. AC voltage waveform has a sinusoidal shape, which means that the voltage alternates between positive and negative values in a smooth, continuous manner. The frequency of the AC waveform is measured in Hertz (Hz), which represents the number of cycles per second. In North America, the standard AC frequency is 60 Hz, while in Europe and most other countries, it is 50 Hz.
Another way to differentiate between an AC and DC power supply is by using a multimeter. A multimeter is a handy tool that measures voltage, current, and resistance. To differentiate between AC and DC power supply, set the multimeter to measure voltage and connect the probes to the power source. If the voltage reading fluctuates between positive and negative values, it is an AC power supply. If the voltage reading remains constant, it is a DC power supply.
DC Power Supply
DC stands for Direct Current, which indicates that the flow of electrons is in one direction only. DC power is commonly used in electronics devices such as computers, televisions, and smartphones. The primary source of DC power is batteries or power supplies that convert AC power to DC power.
DC power supply can be differentiated from AC power supply by the absence of a waveform in the voltage. DC voltage remains constant over time and does not alternate between positive and negative values. The polarity of the DC voltage is also essential since the direction of the current flow depends on it. The positive and negative terminals of a DC power supply are marked, and it is critical to ensure that the device is connected correctly.
A multimeter can also be used to differentiate between an AC and DC power supply. To measure DC voltage, set the multimeter to the DC voltage range and connect the probes to the power source. If the voltage reading remains constant, it is a DC power supply. If the voltage reading fluctuates between positive and negative values, it is an AC power supply.
Conclusion
In summary, AC and DC power supply are two different types of electrical energy used in electronics devices. AC power supply has a sinusoidal waveform and fluctuates between positive and negative values, while DC power supply has a constant voltage value and flows in one direction only. A multimeter is a handy tool that can be used to differentiate between AC and DC power supply. By understanding the differences between AC and DC power supply, you can select the right power supply for your electronic devices and ensure their smooth functioning.
Предыдущий: How to Build an AC-DC Power Supply
Следующий: как подключить переменный ток к постоянному источнику питания
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