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WJEC GCSE Electronics resistive components quiz quiz

15questions. Pick an answer and you'll see why right away.

  1. Two 100 Ω resistors are connected in series. What is the total resistance?

  2. Two 100 Ω resistors are connected in parallel. What is the total resistance?

  3. Which is true of resistors in parallel?

  4. What does the E24 series describe?

  5. A resistor's tolerance of plus or minus 5% means:

  6. In the potential divider equation V_out = V_in × R2 / (R1 + R2), what is R2?

  7. A divider has two equal 10 kΩ resistors across a 6.0 V supply. What is the output across one of them?

  8. A 2.0 kΩ and a 4.0 kΩ resistor form a divider across 9.0 V, output across the 4.0 kΩ. The output is:

  9. How does the resistance of an LDR change as the light gets brighter?

  10. How does the resistance of an NTC thermistor change as it gets hotter?

  11. Why is a sensor such as an LDR used inside a potential divider?

  12. A logic input left connected to nothing when a switch is open is said to be:

  13. A pull-down resistor holds a switch input at which level when the switch is open?

  14. Why must an LED have a series resistor?

  15. An LED with forward voltage 2.0 V runs at 10 mA from a 5.0 V supply. The series resistor is about: