Yr9 - electricity and circuit basics

Download Yr9 - electricity and circuit basics

Post on 07-Aug-2015

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  1. 1. Dr Pusey www.puseyscience.com
  2. 2. Definitions Electricity = The flow of charge through an electrical conductor Circuit = a path through which electricity flows What are the requirements for a circuit? Power source, produces a charge imbalance Complete path of conducting material Two main types of circuit Series Parallel
  3. 3. Important Words Voltage The potential for electricity to flow. Measured in Volts Water Analogy: The amount of pressure pushing the water through the pipe http://hyperphysics.phy-astr.gsu.edu/hbase/electric/watcir2.html
  4. 4. Important Words Current The flow of charge through a conductor Measured in Amperes/Amps Water Analogy: The amount of water that water rushes through the pipe per second. http://hyperphysics.phy-astr.gsu.edu/hbase/electric/watcir2.html
  5. 5. Important Words Resistance The resistance to the flow of current through a conductor Measured in Ohms Water Analogy: The size of the pipe http://hyperphysics.phy-astr.gsu.edu/hbase/electric/watcir2.html
  6. 6. More about Components Batteries are the power source. A circuit will not work without a battery. Resistors restrict the current. Variable resistors can change resistance, like a dimmer switch for your light Voltmeters measure the voltage applied to something. They must be on the outside of the circuit Ammeters simply tell you how much current is going through them, so they need to be inside the circuit Lamps convert electricity into light energy. The more current, the brighter the light!
  7. 7. Circuit symbols DRAW THIS! V A Open Switch Closed Switch Light (Lamp) Ammeter Voltmeter Fuse Battery Cell Resistor Variable Resistor
  8. 8. Example 1 Turn this picture into a circuit diagram using the appropriate symbols
  9. 9. Example 2 Turn this picture into a circuit diagram using the appropriate symbols
  10. 10. Example 2 Turn this picture into a circuit diagram using the appropriate symbols
  11. 11. Example 3 Label the following circuit diagram
  12. 12. Example 3 Label the following circuit diagram
  13. 13. Quick Quiz Draw the circuit for a torch. Include a battery, a lamp and a switch.
  14. 14. Quick Quiz Draw the circuit for a torch. Include a battery, a lamp and a switch.