Investigating resistance

• What is the main focus of the practical investigation mentioned?

  Investigating the factors affecting resistance
• What are the two instruments mentioned for measuring electrical properties?

  Ammeter and Voltmeter
• What is the method to ensure safety during the investigation of resistance?

  • Monitor the temperature of the wire
  • Stop the circuit to allow cooling between readings
• Why is it important to be careful with the temperature of the wire during the investigation?

  Because a large current can cause the wire to heat up
• What should you do to prevent the wire from getting too hot?

  Turn off the circuit between readings
• Where can you find more information about the heating effect of current on wires?

  On page 411
• What is the relationship between the length of the wire and resistance?

  • Longer wires have higher resistance
  • Shorter wires have lower resistance
• What is a useful exam tip related to resistance?

  Consider the length of the wire