# 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)