Multimeter - What are the symbols for AC and DC,
The symbol for alternating current is "~", or AC for short;
The symbol for direct current is "-", or DC for short.
For example, the AC voltage is AC220V, and the DC voltage is DC24V.
The size and direction of the current of alternating current is a current that varies periodically from time to time, and the average value of its operation in one cycle is zero.
DC current, also known as constant current, is constant in size and direction. The current density varies with time, usually moving in the same direction at all times.
Alternating Current (Alternating Current, abbreviation: AC) is alternating current whose direction changes periodically from time to time, with a running average of zero in one cycle. Unlike direct current, its direction changes over time, and direct current does not have a cyclic variation.
"Direct Current (DC), also known as "constant current", is a type of direct current, a direct current whose size and direction are unchanged, and was discovered by Thomas Edison in 1747. In 1747, the American Franklin formulated the law of conservation of electric charge based on experiments and defined the terms positive and negative electricity.
The frequency of alternating current (AC) is the number of times it varies periodically per unit of time in hertz, which is inversely related to the period. The frequency of alternating current (AC) in everyday life is typically 50 Hz or 60 Hz, whereas the frequency of AC involved in radio technology is typically larger, reaching kilohertz (KHz) or even megahertz (MHz) measures.
The AC frequency of the power system varies from country to country, and is usually 50 Hz or 60 Hz. In Asia, 50 Hz is used in China, Japan, Thailand, India and Singapore, while 60 Hz is used in South Korea, the Philippines and Taiwan, 50 Hz is used in most of Europe, and 60 Hz is used in the Americas, mainly in Mexico, the United States and Canada.
