This part specifies the fundamental terms in electrotechnical terminology.
This part is applicable to the standard formulation and reversion, technical document compilation, preparation and translation of professional technology information and teaching material or books and periodicals and is used by the personnel in relevant departments regarding the scientific research, design, production, application, teaching and publication, etc. in electrician specialty.
2 Normative References
The following normative documents contain provisions which, through reference in this text, constitute provisions of this part of GB/T 2900. For dated references, subsequent amendments (excluding corrections), or revisions, of any of these publications do not apply to this part. However parties to agreements based on this part are encouraged to investigate the possibility of applying the most recent editions of the normative documents indicated below. For undated references, the latest edition of the normative document referred to applies.
GB/T 2900.60-2002 Electrotechnical Terminology C Electromagnetism (IEC 60050-121:1998, EQV)
GB/T 2900.61-2008 Electrotechnical Terminology - Physics and Chemistry (IEC 60050-111:1996, MOD)
GB/T 2900.71-2008 Electrotechnical Terminology - Electrical Installations (IEC 60050-826:2004, IDT)
GB/T 2900.72-2008 Electrotechnical Terminology - Polyphase Systems and Circuits (IEC 60050-141:2004, IDT)
GB/T 2900.73-2008 Electrotechnical Terminology - Earthing and Protection Against Electric Shock (IEC 60050-195:1998, MOD)
GB/T 2900.74-2008 Electrotechnical Terminology - Circuit Theory (IEC 60050-131:2002, MOD)
GB/T 2900.83-2008 Electrotechnical Terminology - Electrical and Magnetic Devices (IEC 60050-151:2001, IDT)
GB/T 4365-2003 Electrotechnical Terminology - Electromagnetic Compatibility (IEC 60050-161:1990, IDT)
GB/T 6988.1-2008 Preparation of Documents Used in Electrotechnology - Part 1: Rules (IEC 61802-1:2006, IDT)
IEC 60050-101:1998 International Electrotechnical Vocabulary - Mathematics
3 Terms and Definitions
3.1 Fundamental Terms
3.1.1
scalar quantity
quantity of single real number or complex number
[101-11-09]
Note: In the three-dimensional space with definable sense of direction, the term "scalar quantity" is generally limited to the quantity irrelevant to direction.
3.1.2
vector quantity
quantity which can be represented as an element of a set, in which both the product of any element and either any real or any complex number and also the sum of any two elements are elements of the set
[101-11-10]
Note 1: A vector quantity in an n-dimensional space is characterized by an ordered set of n real or complex numbers, which depend on the choice of the n base vectors if n is greater than 1.
Note 2: For a real two- or three-dimensional space, a vector quantity can be represented as an oriented line segment characterized by its direction and length.
Note 3: A complex vector quantity is defined by a real part and an imaginary part: where and are real vector quantities.
Note 4: A vector quantity is indicated by a letter symbol V in bold-face type or by an arrow above a letter symbol: .
3.1.3
field
state of a region in which a quantity or an interrelated set of quantities exists at each point and depends on the position of the point
