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magnetic circuits, electric devices - Coggle Diagram

- - - - F= Hlc
      - F = NI(CURRENT)
        
        U nits AT ampere turns
      - F = FLUX*RELUCTANCE
        
        ONLY WHEN B = UH
  - - - not always true
        
        only when b = u h
    - - reluctance Lc/Ac*Uc
        
        think like 1/Uc like P(RHO)
        
        always better to draw diagram for the path
        
        keep in mind mean length
        
        BE CAREFUL WE NEED U so sometimes we are given relative permeabiity so according
        
        permebaility = relative * uo
- - - - use Qvcross B
      - but what about the permanent magnets if we want directly
        
        in reality the pole and an expression simialr to columbs lawe is not true
        
        humans decided to go with compass
        
        the direction was decided as the direction from s to n on the compass neddle
    - - actually these dipoles exerience force in non uniform filed
    - - why the second name
        
        becuase flux = b.a
      - it depnds on the medium where the magnet is put
        
        Rather we say that it is more useful in case medium is involved
        
        Maybe this is wrong
      - how to find
        
        in case steady current
        
        biot swart law
        
        amperes law
        
        tricks
        
        choose a loop where H /B is constant vector (direc+mag)
        
        or zero or perpendicular to the path always
        
        go along the loop in the direction of H or B
        
        try to stick to rectangular or circular or well defined shapes
        
        use RIGHT HAND screw rule for + - I
        
        I enclosed or penetrated
        
        surface if used be open
        
        1 more item...
        
        use I = INTG J.dA
    - - how H AND B related
        
        not always a linear but in linear medium B= uH
- - - - use FLUX = B.A
      - USE AMEPERS LAW IN TERMS OF H
      - then corresponding to h find the b using the given curve
- - - - hysteresis
        
        WHY happens
        
        H direction change as I current direction change HL = NI
      - EDDY current in the core
        
        HOW IN TRANSFROMER
  - - - helpful to represent the impedance of the secondary in primary
  - - - Measure real power