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Eduqas GCSE Electronics resistive components and sensing overview quiz quiz

12questions. Pick an answer and you'll see why right away.

  1. On a four-band resistor, what does the third band represent?

  2. A resistor is brown, black, orange, gold. What is its value?

  3. When a variable resistor is used as a potentiometer, how many terminals are connected and what does it provide?

  4. An LED with a forward voltage of 2.0 V2.0\ \text{V} runs at 10 mA10\ \text{mA} from a 5.0 V5.0\ \text{V} supply. What series resistor is needed?

  5. Why does an LED need a series current-limiting resistor?

  6. A potential divider has a 4.0 kΩ4.0\ \text{k}\Omega top resistor and a 2.0 kΩ2.0\ \text{k}\Omega bottom resistor across 9.0 V9.0\ \text{V}, output across the bottom. What is the output?

  7. What happens to a potential divider's output voltage when a low-resistance load is connected across it?

  8. As the light level on an LDR increases, its resistance:

  9. An NTC thermistor and a fixed resistor form a divider with the output across the fixed resistor. As the temperature rises, the output:

  10. What is the charge stored on a 100 μF100\ \mu\text{F} capacitor charged to 4.0 V4.0\ \text{V}?

  11. A 220 μF220\ \mu\text{F} capacitor charges through a 10 kΩ10\ \text{k}\Omega resistor. What is the time constant?

  12. After one time constant, a charging capacitor reaches about what fraction of the supply voltage?