resistors

• Resistor

  A component that adds 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. Graph is a straight line passing through the origin

  4. 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
• Ohm

  Unit of resistance
• Resistance is calculated by dividing potential difference by current
• Resistance can be useful in circuits to control the amount of energy transferred to a component
• Resistors

  • Can have any resistance value needed
• Resistors are added in series with other components to share the potential difference