GCSE Physics – Current-potential difference graphs

Last updated: 25/05/2020
WJEC GCSE Science – Double science foundation Electric circuits GCSE Physics – Current-potential difference graphs

Learning Objectives

-I can draw and explain current-potential difference graphs for ohmic conductors, filament lamps and diodes
-I can explain the change in resistance of a thermistor as the temperature changes
-I can explain the change in resistance of an LDR as the light intensity changes

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  1. Current
  2. Review
  3. Answered

  1. Is resistance constant for resistors?

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  2. How do we test the resistance of a component?

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  3. How is a voltmeter connected?

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  4. How is an ammeter connected?

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  5. What is a current voltage graph?

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  6. A straight diagonal line on an I-V graph represents what?

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  7. What does the INVERSE gradient of a current/voltage graph represent?

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  8. If resistor A has an I-V line above resistor B, which has the highest resistance?

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  9. If resistor A has an I-V line below resistor B, which has the highest resistance?

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  10. What type of conductor produces a straight diagonal line on an I-V graph?

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  11. What does Ohmic conductor mean?

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  12. What does the I-V graph for an Ohmic conductor look like?

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  13. What are thermistors used for?

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  14. What happens to a thermistor as temperature increases?

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  15. What would you use to change the temperature of the thermistor in an experiment?

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  16. What is an LDR?

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  17. What are LDRs used for?

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  18. What happens to an LDR when light intensity increases?

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  19. What happens to an LDR when light intensity decreases?

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  20. How would you conduct an experiment with an LDR?

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  21. Why does the resistance of a filament lamp increase?

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  22. What does the I-V graph for a filament bulb look like?

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  23. What does the I-V graph for a diode look like?

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  24. Why does the I-V graph of a diode have a flat line on the negative V-axis?

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  25. What is the resistance of a diode for negative voltage values?

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