Investigating Resistance in Series and Parallel Circuits

• What is the unit of resistance?

  Ohm (Ω)
• What is the procedure for investigating resistance in series circuits?

  1. Set up a circuit with a battery and resistor.
  2. Calculate resistance using $V =$$IR$.
  3. Add identical resistors one by one.
  4. Calculate overall resistance after each addition.
  5. Repeat until at least 4 resistors are added.
  6. Plot a graph of results.
• What is the formula to calculate resistance in a circuit?

  Resistance = Voltage / Current
• If the potential difference is 12V and the current is 3A, what is the resistance?

  $R =$$\frac{12V}{3A} =$$4Ω$
• What are the variables in the resistance investigation?

  • Independent Variable: Number of identical resistors
  • Dependent Variable: Resistance (Ω)
• What is the goal of the resistance investigation in series circuits?

  • To observe how resistance changes with the addition of resistors.
  • To plot a graph of resistance against the number of resistors.
• How many resistors should be added in total for the investigation?

  At least 4 resistors
• What is the difference between series and parallel circuits in terms of resistance?

  • Series: Total resistance increases with added resistors.
  • Parallel: Total resistance decreases with added resistors.
• What is the first step in the resistance investigation?

  Set up a circuit with a battery and resistor
• What should you do after calculating the resistance of the initial circuit?

  Add another identical resistor
• How does adding identical resistors in series affect the overall resistance?

  Overall resistance increases with each addition
• What is the relationship between the number of resistors and resistance in a series circuit?

  More resistors lead to higher total resistance