Circuits and resistance practical

• What is the first step in investigating adding resistors in series?

  Build the circuit to find its initial resistance.
• Why is it important to measure the potential difference of the battery in the experiment?

  It is necessary to calculate the current through the circuit.
• How do you calculate the current through the circuit?

  Using the formula \( A = \frac{V}{R} \).
• What formula is used to calculate the resistance of the circuit?

  Resistance is calculated using \( R = \frac{V}{I} \).
• What should you do after measuring the current through the circuit in the series experiment?

  Add another resistor in series with the first.
• What happens to the total resistance of the circuit when you add more resistors in series?

  The total resistance increases, leading to reduced current.
• What is the first step when investigating adding resistors in parallel?

  Build the same initial circuit as in the series experiment.
• How do you calculate the resistance of the circuit in the parallel experiment?

  Using the formula \( R = \frac{V}{I} \).
• What should you do after measuring the current through the circuit in the parallel experiment?

  Add another resistor in parallel with the first.
• What happens to the total current through the circuit when resistors are added in parallel?

  The total current increases, leading to decreased total resistance.
• What is the relationship between the number of resistors added in parallel and the overall resistance?

  The more resistors you add, the smaller the overall resistance becomes.
• What are the results of adding resistors in series and parallel circuits?

  • Series: Total resistance increases, current decreases.
  • Parallel: Total current increases, overall resistance decreases.
• What should the results of the experiments agree with?

  What you learnt about resistance in series and parallel circuits.
• What is the purpose of plotting a graph of the number of resistors against total resistance?

  To visualize the relationship between resistors and total resistance.
• What is the unit of resistance?

  Ohm (Ω)
• What is the significance of using identical resistors in the experiments?

  It ensures a fair test and consistent results.
• What does p.d. stand for in the context of the experiments?

  Potential difference.
• What is the unit of current?

  Ampere (A)
• What is the purpose of the warm-up check questions?

  To assess understanding of the concepts before the experiment.