Variable resistance

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  • Variable Resistance
    • Filament bulbs
      • As the potential difference across the wire increases, the electrons move more rapidly
    • Diodes and LEDs
      • A current can only flow through a diode in one direction
      • The resistance of the diode is very high in the reverse direction
      • A light-emitting diode (LED) will only give out light when the current flows in the forward direction above a small threshold
  • LDR
    • The resistance of a light-dependent resistor (LDR) falls as the intensity of light falling on it increases
    • An LDR allows more current to flow in the light compared to the dark
    • Variable Resistance
      • Filament bulbs
        • As the potential difference across the wire increases, the electrons move more rapidly
      • Diodes and LEDs
        • A current can only flow through a diode in one direction
        • The resistance of the diode is very high in the reverse direction
        • A light-emitting diode (LED) will only give out light when the current flows in the forward direction above a small threshold

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