Resistors (AQA GCSE Physics)

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Constant & Variable Resistance

  • Resistors come in two types:
    • Fixed resistors
    • Variable resistors

  • Fixed resistors have a resistance that remains constant
  • Variable resistors can change the resistance through the circuit
    • This therefore can vary the amount of current through the circuit

  • For fixed and variable resistors, once the resistance is set, it will stay at this value no matter how the current changes
  • However, the resistance of components such as lamps, diodes (diodes and LEDs), thermistors and LDRs (light dependent resistors) changes with the current through the component

Fixed & Variable Resistor, downloadable IGCSE & GCSE Physics revision notes

Fixed and variable resistor circuit symbols

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Ashika

Author: Ashika

Expertise: Physics Project Lead

Ashika graduated with a first-class Physics degree from Manchester University and, having worked as a software engineer, focused on Physics education, creating engaging content to help students across all levels. Now an experienced GCSE and A Level Physics and Maths tutor, Ashika helps to grow and improve our Physics resources.