Investigating how the Length of the Wire affects Resistance

• What is the independent variable in the experiment?

  Length of wire
• What is the dependent variable in the experiment?

  Resistance
• What is the control variable in the experiment?

  Temperature of wire
• How is resistance calculated in the experiment?

  Using the formula V = IR
• What should be kept constant throughout the experiment?

  Wire temperature
• What is the procedure for changing the length of the wire?

  • Move the crocodile clip to adjust length
  • Measure resistance for each length
• What equipment is needed for the experiment?

  A test wire, metre ruler, crocodile clip
• What unit is used to measure resistance?

  Ohm (Ω)
• If the length of the wire is doubled, what happens to the resistance?

  Resistance increases
• What factors affect resistance in a wire?

  • Length of wire
  • Cross-sectional area
  • Material of wire
  • Temperature of wire