Resistance of a Different Component

• What is the focus of the investigation described?

  Resistance of different components in a circuit
• What are the steps to investigate resistance in a circuit?

  1. Set up the circuit as shown.
  2. Record the current and voltage.
  3. Adjust the variable resistor to produce new values.
  4. Record these and repeat at least 5 times.
  5. Reverse the power supply leads and collect 5 sets of negative data.
  6. Plot a graph of Current vs Voltage.
  7. Repeat using a diode or a resistor in place of the filament bulb.
• How many times should the measurements be repeated?

  At least 5 times
• What should be plotted on the graph?

  Current vs Voltage
• What happens if the resistor is allowed to heat up?

  The graph produces a curve instead of a straight line
• What should be done to avoid disconnection in the circuit?

  Connect the battery when not in use
• What are the expected results of the investigation?

  • Ohmic behavior
  • Non-Ohmic behavior
• What type of components are being investigated?

  Different components in a circuit
• What is the consequence of connecting the resistor incorrectly?

  The graph may produce a curve instead of a straight line
• What is the significance of reversing the power supply leads?

  To collect negative data sets