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Electronics Worksheet: Electronic Components

Electronics lesson 17: Electronic components · Set 109 · 40 questions
TalentJR

Remember (One part, one job): Resistor: limits current. Capacitor: stores a little charge. Diode: one way only. LED: one way and glows. Buzzer: sound. Motor: spinning. Potentiometer: a knob that changes resistance. LDR: light sensor. Thermistor: heat sensor. Fuse: protects by blowing. Transistor: boosts or switches.

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  1. 1.What does a capacitor do? (a) turns a fan or wheels (b) smooths a wobbly supply (c) glows using little power (d) boosts a small signal
  2. 2.🧩 Which component beeps for an alarm? (a) fuse (b) motor (c) LED (d) buzzer
  3. 3.🧩 A capacitor in a circuit can … (a) make light (b) spin a wheel (c) measure heat (d) store charge briefly
  4. 4.What does a thermistor do? (a) lets current go one way (b) senses how hot it is (c) blows if current is high (d) has coloured bands
  5. 5.What does a transistor do? (a) boosts a small signal (b) senses how hot it is (c) is a resistance knob (d) stores a little charge
  6. 6.What does a resistor do? (a) turns a fan or wheels (b) smooths a wobbly supply (c) beeps for an alarm (d) limits the current
  7. 7.🧩 Which component smooths a wobbly supply? (a) capacitor (b) resistor (c) LED (d) thermistor
  8. 8.True or false: a resistor stores a little charge. (a) False (b) True
  9. 9.What does an LDR do? (a) glows using little power (b) blows if current is high (c) turns a fan or wheels (d) senses how bright it is
  10. 10.🧩 Which part changes electrical energy into movement? (a) an LED (b) a fuse (c) a motor (d) a resistor
  11. 11.🧩 Which part changes electrical energy into sound? (a) a diode (b) a resistor (c) a buzzer (d) a capacitor
  12. 12.🧩 Which component is a resistance knob? (a) potentiometer (b) diode (c) fuse (d) transistor
  13. 13.True or false: a thermistor stores a little charge. (a) True (b) False
  14. 14.What does an LED do? (a) senses how bright it is (b) limits the current (c) lets current go one way (d) glows using little power
  15. 15.True or false: a buzzer smooths a wobbly supply. (a) True (b) False
  16. 16.🧩 Which component senses how bright it is? (a) LDR (b) resistor (c) thermistor (d) fuse
  17. 17.True or false: an LDR beeps for an alarm. (a) False (b) True
  18. 18.True or false: a capacitor lets current go one way. (a) False (b) True
  19. 19.True or false: a capacitor glows using little power. (a) False (b) True
  20. 20.True or false: a capacitor stores a little charge. (a) True (b) False
  21. 21.True or false: a resistor has coloured bands. (a) False (b) True
  22. 22.True or false: a buzzer makes a beeping sound. (a) False (b) True
  23. 23.🧩 Which component senses how hot it is? (a) resistor (b) buzzer (c) motor (d) thermistor
  24. 24.True or false: a resistor lets current go one way. (a) False (b) True
  25. 25.True or false: a buzzer makes things spin. (a) False (b) True
  26. 26.True or false: a fuse senses how bright it is. (a) True (b) False
  27. 27.🧩 Which component glows using little power? (a) LED (b) transistor (c) motor (d) thermistor
  28. 28.True or false: a capacitor smooths a wobbly supply. (a) False (b) True
  29. 29.True or false: a diode smooths a wobbly supply. (a) True (b) False
  30. 30.True or false: a transistor boosts a small signal. (a) False (b) True
  31. 31.True or false: an LDR senses how bright it is. (a) True (b) False
  32. 32.True or false: a motor glows using little power. (a) True (b) False
  33. 33.🧩 Which component makes things spin? (a) buzzer (b) LED (c) thermistor (d) motor
  34. 34.🧩 Which component limits the current? (a) capacitor (b) potentiometer (c) resistor (d) transistor
  35. 35.What does a motor do? (a) senses how hot it is (b) stores a little charge (c) makes things spin (d) has coloured bands
  36. 36.What does a capacitor do? (a) boosts a small signal (b) lets current go one way (c) stores a little charge (d) senses how hot it is
  37. 37.True or false: a resistor glows using little power. (a) False (b) True
  38. 38.True or false: a buzzer senses how bright it is. (a) True (b) False
  39. 39.🧩 Which component boosts a small signal? (a) thermistor (b) fuse (c) resistor (d) transistor
  40. 40.What does a fuse do? (a) limits the current (b) blows if current is high (c) has coloured bands (d) makes a beeping sound

Answer key

  1. smooths a wobbly supply
  2. buzzer
  3. store charge briefly
  4. senses how hot it is
  5. boosts a small signal
  6. limits the current
  7. capacitor
  8. False
  9. senses how bright it is
  10. a motor
  11. a buzzer
  12. potentiometer
  13. False
  14. glows using little power
  15. False
  16. LDR
  17. False
  18. False
  19. False
  20. True
  21. True
  22. True
  23. thermistor
  24. False
  25. False
  26. False
  27. LED
  28. True
  29. False
  30. True
  31. True
  32. False
  33. motor
  34. resistor
  35. makes things spin
  36. stores a little charge
  37. False
  38. False
  39. transistor
  40. blows if current is high

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