P.4- Electric Circuits

?
  • Created by: Inaya_oxo
  • Created on: 04-11-16 17:05
View mindmap
  • P.4- Electric Circuits
    • P4.1 - Electric Charges and Fields
      • Charges
        • neutrons have no charge
        • electrons are negatively charged
        • protons are positively charged
        • a charged atom is called an ion
      • Static Electricity
        • only produced when 2 insulators are rubbed together
        • conductors cant produce it as they pull the flow of charge towards the earth
        • the object that is losing its electrons becomes positively charged
          • the object gaining electrons becomes negatively charged
      • Electric Fields
        • a charged object has an electric field around itself
        • lines can be drawn to represent it
        • if the charges are different the 2 objects will attract
          • if the charges are the same the 2 objects will atract
    • P4.2 - Current and Charge
      • current is the rate of flow of the electrons passing in a wire
        • current is measured in amps
      • voltage is the electrical energy between 2 points in a circuit
      • electric charge is measured in coulombs
      • a diode stops the energy flowing in a particular direction
    • P4.3 - Potential difference and resistance
      • potential difference
        • voltage is measured in volts
        • same thing as voltage
      • resistance
        • is the collisions the electrons have to face when going through a wire
        • measured in ohms
        • in a circuit it limits the current
        • factors that affect
          • length of wire
          • material
          • temperature
    • P4.4 -  component characteristis
      • Faliment lamp
        • it is a non ohmic  conductor
        • the resistance increases as the current increases
        • resistance increases as the filament temperature increases
      • Diode
        • its an non ohmic conductor
        • the resistance changes as the current changes
        • Light emitting diodes light up when a current passes through
      • Thermistors and light-dependent resistors
        • they are used in sensor circuits
        • a thermistors resistance decreases as the temperature increases
        • the resistance of a light-dependent resistor decreases if the light intensity dereases
    • P4.5 - series circuits
      • the same current passes through each component
      • it has no extra branches
      • the voltage is divided between the components
      • when you add another resistor the total resistance in the circuit increases
    • P4.6 -Parallel Circuits
      • they have extra branches
      • the current divides once the branches split in the circuit
      • the voltage is the same as the power supply
      • once you add another resistor the total resistance decreases

Comments

No comments have yet been made

Similar Physics resources:

See all Physics resources »See all Electricity resources »