Resistors

• Resistor


  A component that is used to add resistance into a circuit
• Resistor


  • Symbol is a zigzag line
  • Used to make a circuit dimmer by sharing potential difference with a component
• Calculating resistance


  Divide potential difference by current
• Ohm


  Unit of resistance
• Higher resistance


  More energy transferred as heat
• Increasing potential difference across resistor

  Increases current flowing through resistor
• Ohmic conductor


  • Current is directly proportional to potential difference
  • Resistance is constant if temperature is constant
• Resistance will only stay constant if the temperature is constant