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theoretical consideration the fourth fundamental quantity could be taken as charge which hasthe fundamental unit couloumb. It is possible to derive current from charge and vice versa.However, the reason for selection of current rather than charge as the fundamental quantity isthat ampere serves as the link between electrical, magnetic and mechanical quantities and ismore readly measured.Even though it is possible to function with the seven fundamental units mentioned above,yet if a set of derived units are defined with special names, the resulting equations andcalculations are greatly simplified Table i.1 lists the Derived units in S.I.
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Byte.Bit Addressing:To access a bit in a memory area, you specify the address, which includes the memory area identifier, the byte address, and the bit number.
I 3 4...
Memory Area IdentifierMemory area identifier
Byte address: byte 3 (thefourth byte)
Period separates the byteaddress from the bitnumber
Bit of byte, or bit number:bit 4 of 8 (0 to 7) 7 6 5 4 3 2 1 0
Byte 0Byte 1Byte 2Byte 3Byte 4Byte 5
Process–image Input (I) Memory Area.
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