Section 6- Magnetism and Electro-magnetism

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  • Section 6- Magnetism and Electro-magnetism
    • Magnets and Magnetic Fields
      • Magnets produce Fields
      • Magnetism can be Induced
        • Like poles repel each other
        • Opposite Poles attact
      • To see the magnetic field, you can get a bar magnet and lay a paper on top and put iron filing on top of it.
      • Magnetic Field Line means the path strength of magnet
    • Electro-magnetism
      • A current- Carrying wire creates a magnetic Field
      • There is a magnetic Field around a straight, current- carrying wire
      • The magnetic field around a straight wire
    • The Motor Effect
      • It is a magnet exerting a force on the carry wireing
      • This simple device shows that when an electrical current flows through a magnetic field, a force is exerted on the current. This force can be used to make an electric motor.
    • Electric Motors and Loudspeakers
      • A loudspeaker is a linear motor with a small range. It has a single moving coil that is permanently but flexibly wired
      • The coil moves in the field of a permanent magnet, which is usually shaped to produce maximum force on the coil.
      • Electric Motors only work on direct current
        • This is because current only flows in one direction
    • Electromagnetic Induction
      • Electromagnetic induction occurs when a circuit with an alternating current flowing through it generates current in another circuit simply by being placed nearby.
      • An alternating current is the kind of electricity flowing through power lines and home wiring, as opposed to a direct current, which we get from batteries.
      • Faraday's Law. is the right hand rule
    • Transformers
      • Transformers change the voltage up and down
      • They work by combining an oscillating electromagnets with another coil to induce
      • Transformers only work on Alternating Current
      • If the voltage decreases it is called a step down
      • If the voltage increases it is called at step down.
      • The ratio of turns= ration of the voltage
      • Equation is Input (Primary) Voltage/ Output (secondary) Voltage= Number of turns on primary/ number of turns on secondary


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