Thursday 5 August 2021

Term 3 Week 2 2021

  Homework

  • Act 13A, p.205-206 Level 2 D.C. Circuit Revision
  • Act 13B, p.210-211 Internal Resistance of a Battery
  • Act 13C, p.214-216 Kirchhoff's Laws
  • Act 14A, p.224 Capacitors
  • Act 14B, p.228-229 Capacitor Networks & Energy
  • Act 14C, p.233-235 Charging and Discharging Graphs for Capacitors
  • Act 15A, 243-244 Induced Voltage and Current, Lenz's Law, Lorentz Law, Magnetic Flux
  • Act 15B, p.247 Transformers
  • Act 15C, p.253 Inductance
  • Act 15D, p.256-258 Powering Up and Down Graphs for Inductors

  • Right Hand Screw Rule


    Right Hand Slap Rule

    Magnetic Flux










    Lenz's Law

    Faraday's Law & Lenz's Law


    Inductance






    Transformers


    The ratio of the secondary to primary voltage is equal to the ratio of the secondary to primary turns

    Vs/Vp = Ns/Np

    In an Ideal Transforme
    Secondary Power = Primary Power
    In reality, energy is lost through heat from eddy currents generated in the soft iron core from the changing flux.

    NB: As Voltage is often referred to as e.m.f. the Symbol "e" or "E" is often used in engineering to refer to e.m.f.
    This is the case in the video below.
    After explaining how basic Transformers work, this video goes on to explain 3-Phase Transformers.

    NZ Street Step-Down Transformer

    Internal Diagram of a Transformer

    How Do Substations Work?

    Fuse MCB, How it Works


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