In parallel

• 1. Using the same equipment as in series (so it's a fair test), build the same initial circuit but in parallel
• 2. Measure the total current through the circuit and calculate the resistance of the circuit using R = V / I

  
• 3. Next, add another resistor, in parallel with the first

  
• 4. Measure the total current through the circuit and use this and the potential difference of the battery to calculate the overall resistance of the circuit

  
• 5. Repeat steps 3 and 4 until you've added all of you resistors
• 6. Plot a graph of the number of resistors in the circuit against the total resistance