Electricity

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  • Physics- Electricty
    • Circuits
      • series
        • Voltage splits, amps stay the same
      • Parralel
        • Voltage stays the same, amps split
      • Direct current flows in one direction
        • Untitled
    • Static Electricity
      • like charges repel (--) (++)
      • unlike charges attract (-+)
      • Objects become charged by friction as electrons move
      • Anexcess of electrons means an object is negatively charged
        • A lack of free electrons means an object is positively charge
    • Electric circuits
      • A cell pushes electrons around
        • A battery contains 2 or more cells
      • A switch enables the current to be switched on or off
      • An indicator emits lights when a current passes through it
      • A diode allows the current to flow in one directon
      • An LED emits light when a current is passed through
      • An ameter is used to measure electric current
        • A voltmeter is used to measure potential difference (voltage)
    • Measurments
      • An electric charge is measured in coloumbs
      • Current is measured in amperes
      • Current = charge / time taken
      • 1 volt gives 1 joule of energy to each coloumb of charge
    • Calculations
      • Power (Watts) - energy transferred / times (s)
      • Power supplied = current * potential difference
      • Voltage = current * resistance
        • Resistance = voltage / current
  • An indicator emits lights when a current passes through it
  • An ameter is used to measure electric current
    • A voltmeter is used to measure potential difference (voltage)

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