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1.0 Machinery Principles, 变形电锯（1.1）启动旋转，有能量，他是牛顿（1.2), 牛顿吸引装备变钢铁侠（1…

- - - - Prime mover
        
        Water turbine
        
        Diesel engine
        
        Steam
      - mechanical energy to electric energy
        
        Action of a magnetic action
    - - Electrical energy to mechanical energy
  - - - from one voltage level to another voltage level
    - - High voltage, reduce transmission losses
- - - - Ampere's = direction of thumb is I, rotation is B
      - Direction of thumb is north pole (N), rotation is I
    - - Left-hand rule
        
        Motor (I is supplied)
      - Right-hand rule
        
        Generator (I is generated)
  - - - Magnetic Circuit
        
        Φ = BA = (μNiA) / lc = Ni (μA / lc) = Ni / R
  - - - Amount of flux not only depend on the amount of current applied to the winding
- - - - F = ma
    - - T = Ja
        
        J = the moment of inertia (kgm^2)
  - - - W = Fr
      - W = 𝜏θ
  - - - ω = dθ/dt
    - - a = dω/dt
    - - T = (F)(r sinθ)
  - - - restricted to one angular dimension
        
        CW = -ve angle
        
        CCW = +ve angle
- - - - e(ind) = -dΦ/dt = -N(dΦ/dt)
    - - e(ind) = dλ/dt
  - - - an electric current induced by an alternating magnetic field
      - eddy current flow circumferential direction
      - it generates its own magnetic field which counteracts the magnetic field of the coil
      - the self induction is low and the current consumption high in AC
    - - Definition
        
        An eddy current of magnitude flow through a core path of resistance, it will dissipate energy in the form of heat according to the power equation
      - Formula (power equation)
        
        P = I^2 x R
      - effect
        
        eddy current loss also increases the temperature of the magnitude material
      - Methods of reducing
        
        Lamination
        
        by splitting the solid core as thin sheets in the plane parallel to the magnetic field
        
        Each lamination is insulated from the other by a thin layer of coating of varnish or oxide film
        
        High resistance magnetic material
        
        such as silicon steel
      - Application
        
        Induction heating
        
        Braking of trains