What is the aim of the resistance of a wire experiment?

To investigate the relationship between the length of a wire and its resistance.

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What is the independent variable in the resistance of a wire experiment?

Length of the wire.

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What is the dependent variable in the resistance of a wire experiment?

Resistance of the wire.

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What are the control variables in the resistance of a wire experiment?

  1. Thickness of the wire
  2. Material of the wire
  3. Temperature of the wire

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How is the resistance of a wire calculated?

R = IV​


Where:

  • R = Resistance (Ω)
  • V = Voltage (V)
  • I = Current (A)

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What equipment is used in the resistance of a wire experiment?

  1. Power supply
  2. Ammeter
  3. Voltmeter
  4. Crocodile clips
  5. Wire
  6. Metre ruler
  7. Switch
  8. Connecting wires
  9. Resistor

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What is the relationship between length and resistance?

Resistance is directly proportional to length. As length increases, resistance increases.

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What could cause errors in the resistance of a wire practical?

  1. Wire heating up
  2. Insensitive voltmeters/ammeters
  3. Imprecise length measurements

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How could the resistance of a wire experiment be improved?

  1. Allow wire to cool between readings
  2. Use more sensitive instruments
  3. Use mm scale ruler
  4. Take repeat readings and calculate average result

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What does the graph of length vs resistance look like?

A straight line graph, showing direct proportion.

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