← Electronic components lesson New set →

Electronics Worksheet: Electronic Components

Electronics lesson 17: Electronic components · Set 132 · 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.🧩 A capacitor in a circuit can … (a) make light (b) store charge briefly (c) spin a wheel (d) measure heat
  2. 2.🧩 Which component beeps for an alarm? (a) fuse (b) transistor (c) buzzer (d) potentiometer
  3. 3.🧩 Which component glows using little power? (a) motor (b) fuse (c) LED (d) resistor
  4. 4.True or false: a buzzer has coloured bands. (a) True (b) False
  5. 5.What does a capacitor do? (a) smooths a wobbly supply (b) lets current go one way (c) makes things spin (d) makes a beeping sound
  6. 6.🧩 Which part changes electrical energy into movement? (a) a resistor (b) a motor (c) an LED (d) a fuse
  7. 7.What does a buzzer do? (a) makes things spin (b) stores a little charge (c) makes a beeping sound (d) blows if current is high
  8. 8.True or false: a fuse lets current go one way. (a) False (b) True
  9. 9.🧩 Which component boosts a small signal? (a) LDR (b) transistor (c) motor (d) fuse
  10. 10.True or false: a fuse blows if current is high. (a) True (b) False
  11. 11.🧩 Which component makes a beeping sound? (a) potentiometer (b) thermistor (c) buzzer (d) motor
  12. 12.What does a fuse do? (a) boosts a small signal (b) blows if current is high (c) glows using little power (d) makes a beeping sound
  13. 13.True or false: a resistor blows if current is high. (a) True (b) False
  14. 14.🧩 Which component senses how bright it is? (a) potentiometer (b) motor (c) buzzer (d) LDR
  15. 15.🧩 Which component makes things spin? (a) potentiometer (b) transistor (c) motor (d) buzzer
  16. 16.🧩 Which component senses how hot it is? (a) LED (b) thermistor (c) LDR (d) capacitor
  17. 17.🧩 Which component turns a fan or wheels? (a) resistor (b) motor (c) transistor (d) buzzer
  18. 18.What does a motor do? (a) stores a little charge (b) beeps for an alarm (c) senses how hot it is (d) turns a fan or wheels
  19. 19.True or false: a fuse makes things spin. (a) False (b) True
  20. 20.True or false: a fuse boosts a small signal. (a) True (b) False
  21. 21.What does a potentiometer do? (a) blows if current is high (b) smooths a wobbly supply (c) senses how hot it is (d) is a resistance knob
  22. 22.🧩 Which component limits the current? (a) LDR (b) resistor (c) buzzer (d) capacitor
  23. 23.True or false: an LDR has coloured bands. (a) True (b) False
  24. 24.True or false: a motor has coloured bands. (a) True (b) False
  25. 25.🧩 Which component smooths a wobbly supply? (a) capacitor (b) fuse (c) motor (d) potentiometer
  26. 26.What does a thermistor do? (a) senses how hot it is (b) is a resistance knob (c) turns a fan or wheels (d) has coloured bands
  27. 27.What does an LDR do? (a) senses how bright it is (b) boosts a small signal (c) makes things spin (d) turns a fan or wheels
  28. 28.🧩 Which part changes electrical energy into sound? (a) a capacitor (b) a resistor (c) a buzzer (d) a diode
  29. 29.What does a resistor do? (a) has coloured bands (b) lets current go one way (c) is a resistance knob (d) makes things spin
  30. 30.🧩 Which component stores a little charge? (a) transistor (b) resistor (c) fuse (d) capacitor
  31. 31.True or false: a motor makes things spin. (a) True (b) False
  32. 32.What does a resistor do? (a) makes a beeping sound (b) limits the current (c) boosts a small signal (d) turns a fan or wheels
  33. 33.What does an LED do? (a) makes a beeping sound (b) limits the current (c) glows using little power (d) blows if current is high
  34. 34.True or false: a buzzer beeps for an alarm. (a) True (b) False
  35. 35.True or false: an LDR is a resistance knob. (a) False (b) True
  36. 36.What does a capacitor do? (a) stores a little charge (b) is a resistance knob (c) boosts a small signal (d) turns a fan or wheels
  37. 37.What does a transistor do? (a) boosts a small signal (b) makes things spin (c) is a resistance knob (d) glows using little power
  38. 38.🧩 Which component blows if current is high? (a) fuse (b) diode (c) capacitor (d) resistor
  39. 39.🧩 Which component has coloured bands? (a) capacitor (b) resistor (c) fuse (d) buzzer
  40. 40.True or false: a resistor has coloured bands. (a) True (b) False

Answer key

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

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