AQA GCSE Physics

Revision Notes

2.1.5 Resistors

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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