← Electronic components lesson New set →

Electronics Worksheet: Electronic Components

Electronics lesson 17: Electronic components · Set 505 · 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.🧩 Which component boosts a small signal? (a) resistor (b) LED (c) transistor (d) motor
  2. 2.True or false: a capacitor smooths a wobbly supply. (a) True (b) False
  3. 3.🧩 Which component blows if current is high? (a) fuse (b) transistor (c) resistor (d) LED
  4. 4.What does a motor do? (a) has coloured bands (b) turns a fan or wheels (c) lets current go one way (d) makes a beeping sound
  5. 5.What does a fuse do? (a) has coloured bands (b) makes things spin (c) boosts a small signal (d) blows if current is high
  6. 6.What does a thermistor do? (a) has coloured bands (b) beeps for an alarm (c) smooths a wobbly supply (d) senses how hot it is
  7. 7.🧩 Which part changes electrical energy into sound? (a) a resistor (b) a buzzer (c) a diode (d) a capacitor
  8. 8.True or false: a buzzer makes things spin. (a) True (b) False
  9. 9.True or false: a capacitor lets current go one way. (a) True (b) False
  10. 10.What does a buzzer do? (a) turns a fan or wheels (b) beeps for an alarm (c) stores a little charge (d) limits the current
  11. 11.🧩 Which component smooths a wobbly supply? (a) resistor (b) LED (c) capacitor (d) transistor
  12. 12.True or false: an LDR stores a little charge. (a) True (b) False
  13. 13.🧩 Which component senses how hot it is? (a) capacitor (b) LDR (c) fuse (d) thermistor
  14. 14.True or false: a capacitor has coloured bands. (a) False (b) True
  15. 15.What does a motor do? (a) makes a beeping sound (b) makes things spin (c) stores a little charge (d) glows using little power
  16. 16.True or false: a transistor boosts a small signal. (a) False (b) True
  17. 17.True or false: a buzzer makes a beeping sound. (a) False (b) True
  18. 18.What does an LED do? (a) senses how bright it is (b) beeps for an alarm (c) boosts a small signal (d) glows using little power
  19. 19.True or false: an LDR senses how bright it is. (a) True (b) False
  20. 20.🧩 Which part changes electrical energy into movement? (a) an LED (b) a fuse (c) a motor (d) a resistor
  21. 21.True or false: a buzzer senses how bright it is. (a) False (b) True
  22. 22.🧩 Which component has coloured bands? (a) buzzer (b) resistor (c) motor (d) thermistor
  23. 23.True or false: a fuse turns a fan or wheels. (a) False (b) True
  24. 24.What does a resistor do? (a) lets current go one way (b) boosts a small signal (c) limits the current (d) smooths a wobbly supply
  25. 25.What does a resistor do? (a) has coloured bands (b) makes things spin (c) smooths a wobbly supply (d) turns a fan or wheels
  26. 26.What does a capacitor do? (a) glows using little power (b) stores a little charge (c) blows if current is high (d) beeps for an alarm
  27. 27.What does a diode do? (a) makes a beeping sound (b) boosts a small signal (c) limits the current (d) lets current go one way
  28. 28.🧩 Which component makes a beeping sound? (a) buzzer (b) transistor (c) LDR (d) diode
  29. 29.True or false: a buzzer turns a fan or wheels. (a) False (b) True
  30. 30.🧩 Which component beeps for an alarm? (a) motor (b) resistor (c) transistor (d) buzzer
  31. 31.🧩 A capacitor in a circuit can … (a) make light (b) measure heat (c) spin a wheel (d) store charge briefly
  32. 32.🧩 Which component limits the current? (a) transistor (b) motor (c) resistor (d) LED
  33. 33.True or false: a thermistor senses how hot it is. (a) True (b) False
  34. 34.True or false: an LDR senses how hot it is. (a) True (b) False
  35. 35.True or false: an LED glows using little power. (a) True (b) False
  36. 36.True or false: a resistor limits the current. (a) False (b) True
  37. 37.What does an LDR do? (a) blows if current is high (b) stores a little charge (c) senses how bright it is (d) limits the current
  38. 38.🧩 Which component glows using little power? (a) LED (b) LDR (c) fuse (d) resistor
  39. 39.True or false: a potentiometer boosts a small signal. (a) True (b) False
  40. 40.True or false: a capacitor senses how hot it is. (a) False (b) True

Answer key

  1. transistor
  2. True
  3. fuse
  4. turns a fan or wheels
  5. blows if current is high
  6. senses how hot it is
  7. a buzzer
  8. False
  9. False
  10. beeps for an alarm
  11. capacitor
  12. False
  13. thermistor
  14. False
  15. makes things spin
  16. True
  17. True
  18. glows using little power
  19. True
  20. a motor
  21. False
  22. resistor
  23. False
  24. limits the current
  25. has coloured bands
  26. stores a little charge
  27. lets current go one way
  28. buzzer
  29. False
  30. buzzer
  31. store charge briefly
  32. resistor
  33. True
  34. False
  35. True
  36. True
  37. senses how bright it is
  38. LED
  39. False
  40. False

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