Resistors

• Resistor


  A component that adds resistance to a circuit
• Resistor


  • Symbol can be recognized
  • Used to add resistance to a circuit
• Current-potential difference graph for an ohmic conductor

  1. Plot potential difference on x-axis

  2. Plot current on y-axis

  3. Obtain a straight line passing through the origin

  4. Indicates current is directly proportional to potential difference

  5. Resistance is constant
• Increasing potential difference across a resistor

  Increases the current flowing through the resistor
• Resistance


  • Potential difference required to drive a current through a component
  • Calculated by dividing potential difference by current
  • Unit is the ohm
• Resistance can be useful in circuits, as it allows control over the current and energy transfer
• Resistance only stays constant if the temperature is constant for an ohmic conductor