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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