P5

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  • P5-Electricity
    • Static Electricity
    • Circuits
      • Series
        • The current is the same across the circuit
        • The potential difference is different around components because voltage is shared. When added up it is the same as the potential difference of the battery.
        • Resistance adds up from the individualcomponents
      • Parallel
        • Total current is shared between branches and all components
        • The potential difference is the same across all components(including battery) as the voltage is the same everywhere in the circuit
        • Potential difference is the 'work done'- the amount of energy transferred / voltage between two points in a circuit.
          • Series
            • The current is the same across the circuit
            • The potential difference is different around components because voltage is shared. When added up it is the same as the potential difference of the battery.
            • Resistance adds up from the individualcomponents
          • Voltmeter measures this in Volts,
            • The Voltmeter must be placed in parallel with a component so it can compare the energy the charge has  before and after passing through the component.
          • When energy is transferred, 'work is done'
      • Symbols
        • REMEMBER WHAT THEY LOOK LIKE
      • The voltage of a battery shows how much work the battery will do to the charge that passes through it(how big a "push" it gives it)
    • Resistance
      • Voltage divided by Current
      • Measured in Ohms
    • Transformers
      • Only uses AC
      • Step up
        • More turns on the secondary coil.
        • Increases voltage
      • Step down
        • more turns on the primary coil
        • Decrease voltage
      • 4 things needed to change the size of a voltage
        • Add an Iron Core
        • Increasing turns on a coil
        • Increasing speed of rotation
        • Increasing the strength of the magnetic field
      • Electromagn-etic Induction
    • Generators
    • Motors
      • Uses DC
      • Fleming's Left Hand Rule
        • thuMb Motion
        • First finger Field
        • Second finger Current
      • What can electric motors be used in?
        • Washing Machines, Fridges, and Vacuum cleaners
        • In a DVD player
    • Magnetic Fields
    • Current
      • Voltage divided by Resistance
      • Measured with ammeter, amps
      • Flow of free electrons
  • The split -ring commutator is a clever way of swapping the electrical contacts every half turn
    • This reverses the direction of the current every half turn to keep the coil rotating continuously in the same direction
    • Motors
      • Uses DC
      • Fleming's Left Hand Rule
        • thuMb Motion
        • First finger Field
        • Second finger Current
      • What can electric motors be used in?
        • Washing Machines, Fridges, and Vacuum cleaners
        • In a DVD player

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