Three-phase electric power is a common method of alternating current electric power generation, transmission, and distribution. It is a type of polyphase system and is the most common method used by electrical grids worldwide to transfer power. It is also used to power large motors and other heavy loads.
A three-wire three-phase circuit is usually more economical than an equivalent two-wire single-phase circuit at the same line to ground voltage because it uses less conductor material to transmit a given amount of electrical power. Polyphase power systems were independently invented by Galileo Ferraris, Mikhail Dolivo-Dobrovolsky, Jonas Wenström, John Hopkinson and Nikola Tesla in the late 1880s.
A number expressed by 0s and 1s is referred to as a binary literal (binary digits). Integral types (byte, short, int, and long) can be expressed in Java using a binary number system.
The integral value might be prefixed with 0b or 0B to specify a binary literal. By constantly dividing the supplied number by 2 until we receive 0 as the quotient, we can convert a decimal number to a binary number in the simplest way possible. The binary value of the specified decimal number is then obtained by writing the remainders in reverse order. Any of the digits 0 through 9 can be found in a decimal integer literal. The octal integer literal, as opposed to the decimal integer literal, is used to interpret integer literals that start with the number 0.
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Metadata is data about data.
For example, a mp3 file is data, metadata would be data explaining the artist, song name, album, etc.
In a database, the data would be a record, metadata about this could include if the data was an integer or a string, as well as the size limit for this field.
