V=IR

• What does the equation v = ir stand for?

  Potential difference (voltage) equals current times resistance
• What is the resistance calculated from a 24 volt battery and a current of 8 amps?


  3 ohms
• What happens to current when voltage increases while resistance remains constant?


  The current increases proportionally
• What is the relationship between voltage, current, and resistance in a circuit?

  • Voltage (v) = Current (i) × Resistance (r)
  • If resistance is constant, increasing voltage increases current proportionally
• What does a steeper line on a current versus potential difference graph indicate?


  It indicates a smaller resistance
• What are the characteristics of filament lamps and diodes in terms of current and resistance?


  Filament Lamps:

  • Current increases resistance as it heats up
  • Curve becomes less steep at higher currents

  
  

  Diodes:

  • Allow current flow only in one direction
  • High resistance in reverse direction prevents current flow
• Current is the flow of electric charge per unit of time.
• The current through the resistor is directly proportional to the potential difference across it.
• Resistance is a measure of how much a material opposes the flow of electric current.
• If the resistance changes, the relationship between voltage and current becomes non-linear.