aqa physics circuits

PLEASE NOTE THIS I A BAISIC MINDMAP AND IS NOT ALL YOU NEED TO KNOW ABOUT CIRCUITS

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  • CIRCUITS
    • Current and potential difference
      • current is the flow of electric charge round a circuit
      • current will only flow through a component if there is a potential difference across it
      • potential difference is the driving force pushes the current around (in VOLTS)
      • the greater the resistance across a component the smaller the current that flows
      • CURRENT = CHARGE / TIME
      • P.D = WORK DONE / CHARGE
        • CURRENT x RESISTANCE
    • THE BASICS
      • the ammeter
        • measures current in AMPS
        • must be placed in a series
        • can never be parallel to the volmeter
      • the volmeter
        • measures potential difference in VOLTS
        • must be placed in parallel around the component not the variable resistor or the battery
      • very basic circuits are used for V-I graphs
      • as you vary the variable resistor it alters the current flowing through a circuit
    • GRAPHS
      • the current through the resistor is directly proportional to the P.D
      • as the temperature of the filament increases the resistance increases
        • RESISTANCE ALWAYS INCREASES WITH TEMPRATURE
      • current will only flow through a diode in one direction. It has a very high resistance in the opposite direction
    • SERIES CIRCUITS
      • P.D. is shared between the components
      • current is the same everywhere
      • total resistance is the resistance added up throughout the whole circuit
      • cell voltages are added up
    • PARALLEL CIRCUITS
      • P.D, is the same across all components
      • current is shared between the branches

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