← Electronic components lesson New set →

Electronics Worksheet: Electronic Components

Electronics lesson 17: Electronic components · Set 10 · 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.

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

Answer key

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

Free electronics lessons, practice and worksheets at talentjr.in/electronics-for-kids