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What's PCB? (A printed circuit board mechanically supports and…

- - - - what's subtractive manufacturing?
        
        Machining is any of various processes in which a piece of raw material is cut into a desired final shape and size by a controlled material-removal process. The processes that have this common theme, controlled material removal, are today collectively known as subtractive manufacturing,
  - - - what's electric charge
        
        Electric charge is the physical property of matter that causes it to experience a force when placed in an electromagnetic field.
      - what's electric current?
        
        An electric current is the rate of flow of electric charge past a point[1]:2[2]:622 or region.[2]:614 An electric current is said to exist when there is a net flow of electric charge through a region.
      - what's electric field?
        
        An electric field surrounds an electric charge, and exerts force on other charges in the field, attracting or repelling them.[1][2] Electric field is sometimes abbreviated as E-field.[3] The electric field is defined mathematically as a vector field that associates to each point in space the (electrostatic or Coulomb) force per unit of charge exerted on an infinitesimal positive test charge at rest at that point.
        
        what's vector field?
        
        In vector calculus and physics, a vector field is an assignment of a vector to each point in a subset of space
        
        what's vector calculus?
        
        Vector calculus, or vector analysis, is a branch of mathematics concerned with differentiation and integration of vector fields, primarily in 3-dimensional Euclidean space {\displaystyle \mathbb {R} ^{3}.}\mathbb {R} ^{3}. The term "vector calculus" is sometimes used as a synonym for the broader subject of multivariable calculus, which includes vector calculus as well as partial differentiation and multiple integration. Vector calculus plays an important role in differential geometry and in the study of partial differential equations. It is used extensively in physics and engineering, especially in the description of electromagnetic fields, gravitational fields and fluid flow.
        
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