Investigating components

• What is the purpose of the simple experiment mentioned?

  To investigate different components
• What can the standard test circuit be used for?

  To investigate the relationship between current, voltage, and resistance
• In what configuration must the ammeter be placed in the circuit?

  In series with the component under test
• How can the relationship between current, voltage, and resistance be shown?

  With an I-V graph
• What does the standard test circuit contain?

  • Ammeter
  • Voltmeter
  • Resistor
• What does the ammeter measure in the circuit?

  The current flowing through the component
• What does the voltmeter measure?

  The potential difference across the component
• How should the voltmeter be connected in the circuit?

  In parallel with the component under test
• What happens if the circuit gets too hot?

  It can affect the results of the experiment
• What should you do if the circuit starts to warm up?


  Disconnect it for a while
• What should be done after conducting the experiment?

  Repeat the measurements and calculate means
• How can you determine the resistance of the component?

  Using the formula \( R = \frac{V}{I} \)
• What does changing the output potential difference affect?

  It alters the current flowing through the circuit
• What should you do with several readings from the ammeter and voltmeter?

  Analyze how current varies with potential difference
• What is the significance of plotting the current against potential difference?

  It helps visualize the relationship between them
• What should you ensure about the circuit during the experiment?

  It doesn't get too hot
• What is the purpose of using the data collected?

  To work out the resistance for each measurement
• What should you refer to for more information about collecting data?

  Page 72
• What should you do if the circuit starts to warm up?

  Connect it for a while between readings
• Why should you repeat measurements in an experiment?

  To ensure accuracy and reliability of results
• Where can you find more information about collecting accurate results?

  Page 72
• What can you investigate using diodes, LDRs, and thermistors?

  Electrical characteristics and behaviors
• How can you create I-V graphs for diodes, thermistors, and LDRs?


  By using the method described above
• What happens to current flow through a diode after measurements?

  It cannot flow through the diode anymore
• What do thermistors do in an experiment?

  Keep the supply potential difference constant
• How does the current through a thermistor change with temperature?

  It increases as the temperature rises
• What is the effect of increasing temperature on the resistance of an LDR?

  The resistance decreases as temperature increases
• What is the purpose of measuring the current through a component?

  To determine the potential difference across it
• How does the supply potential difference affect the current through a component?

  Higher potential difference increases the current
• What happens to the current through a component as the resistance increases?

  The current decreases as resistance increases
• What are the components used in the experiment to measure current and potential difference?

  • Diodes
  • LDRs (Light Dependent Resistors)
  • Thermistors
• What factors affect the current through a circuit component?

  • Supply potential difference
  • Resistance of the component
  • Temperature of the environment
• What are the key steps in conducting an experiment with diodes, LDRs, and thermistors?

  1. Connect the components in a circuit
  2. Measure current and potential difference
  3. Repeat measurements for accuracy
  4. Analyze the results to draw conclusions
• What is the significance of using a constant supply potential difference in experiments?

  • Ensures consistent results
  • Reduces variability in measurements
  • Allows for accurate comparisons
• How does temperature influence the behavior of thermistors and LDRs?

  • Thermistors: Resistance decreases with temperature increase
  • LDRs: Resistance decreases with light intensity increase
• What is the relationship between current, resistance, and potential difference in a circuit?

  • Ohm's Law: $V =$$I \cdot R$
  • Current is inversely proportional to resistance
  • Current is directly proportional to potential difference