← Electronic components lesson New set →

Electronics Worksheet: Electronic Components

Electronics lesson 17: Electronic components · Set 186 · 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 part changes electrical energy into sound? (a) a buzzer (b) a capacitor (c) a resistor (d) a diode
  2. 2.What does an LDR do? (a) boosts a small signal (b) limits the current (c) makes a beeping sound (d) senses how bright it is
  3. 3.🧩 A capacitor in a circuit can … (a) spin a wheel (b) measure heat (c) store charge briefly (d) make light
  4. 4.🧩 Which component senses how bright it is? (a) resistor (b) buzzer (c) LDR (d) fuse
  5. 5.🧩 Which component smooths a wobbly supply? (a) capacitor (b) buzzer (c) potentiometer (d) fuse
  6. 6.True or false: a fuse turns a fan or wheels. (a) False (b) True
  7. 7.🧩 Which component stores a little charge? (a) buzzer (b) motor (c) capacitor (d) diode
  8. 8.True or false: a motor blows if current is high. (a) True (b) False
  9. 9.🧩 Which component makes things spin? (a) LDR (b) resistor (c) thermistor (d) motor
  10. 10.🧩 Which part changes electrical energy into movement? (a) a motor (b) a resistor (c) an LED (d) a fuse
  11. 11.What does a diode do? (a) makes things spin (b) limits the current (c) lets current go one way (d) beeps for an alarm
  12. 12.What does a transistor do? (a) beeps for an alarm (b) glows using little power (c) makes things spin (d) boosts a small signal
  13. 13.True or false: a motor makes a beeping sound. (a) True (b) False
  14. 14.What does a resistor do? (a) blows if current is high (b) senses how bright it is (c) has coloured bands (d) is a resistance knob
  15. 15.True or false: a capacitor stores a little charge. (a) True (b) False
  16. 16.What does a buzzer do? (a) turns a fan or wheels (b) beeps for an alarm (c) makes things spin (d) senses how bright it is
  17. 17.True or false: a diode lets current go one way. (a) True (b) False
  18. 18.True or false: a buzzer makes things spin. (a) False (b) True
  19. 19.🧩 Which component limits the current? (a) capacitor (b) motor (c) resistor (d) potentiometer
  20. 20.What does a resistor do? (a) smooths a wobbly supply (b) limits the current (c) stores a little charge (d) beeps for an alarm
  21. 21.True or false: an LED boosts a small signal. (a) True (b) False
  22. 22.🧩 Which component makes a beeping sound? (a) resistor (b) buzzer (c) capacitor (d) diode
  23. 23.🧩 Which component beeps for an alarm? (a) resistor (b) LDR (c) capacitor (d) buzzer
  24. 24.What does a buzzer do? (a) makes a beeping sound (b) senses how hot it is (c) lets current go one way (d) blows if current is high
  25. 25.🧩 Which component boosts a small signal? (a) buzzer (b) transistor (c) LDR (d) LED
  26. 26.True or false: a resistor limits the current. (a) True (b) False
  27. 27.True or false: a diode smooths a wobbly supply. (a) True (b) False
  28. 28.🧩 Which component blows if current is high? (a) LED (b) transistor (c) buzzer (d) fuse
  29. 29.🧩 Which component glows using little power? (a) buzzer (b) motor (c) potentiometer (d) LED
  30. 30.True or false: a thermistor senses how hot it is. (a) True (b) False
  31. 31.🧩 Which component senses how hot it is? (a) LDR (b) thermistor (c) LED (d) fuse
  32. 32.🧩 Which component turns a fan or wheels? (a) motor (b) transistor (c) LDR (d) thermistor
  33. 33.What does a potentiometer do? (a) beeps for an alarm (b) senses how bright it is (c) is a resistance knob (d) glows using little power
  34. 34.True or false: a potentiometer senses how bright it is. (a) False (b) True
  35. 35.True or false: a buzzer beeps for an alarm. (a) True (b) False
  36. 36.True or false: a potentiometer is a resistance knob. (a) True (b) False
  37. 37.What does a motor do? (a) has coloured bands (b) limits the current (c) glows using little power (d) turns a fan or wheels
  38. 38.True or false: an LDR blows if current is high. (a) False (b) True
  39. 39.True or false: a capacitor limits the current. (a) False (b) True
  40. 40.🧩 Which component is a resistance knob? (a) capacitor (b) motor (c) fuse (d) potentiometer

Answer key

  1. a buzzer
  2. senses how bright it is
  3. store charge briefly
  4. LDR
  5. capacitor
  6. False
  7. capacitor
  8. False
  9. motor
  10. a motor
  11. lets current go one way
  12. boosts a small signal
  13. False
  14. has coloured bands
  15. True
  16. beeps for an alarm
  17. True
  18. False
  19. resistor
  20. limits the current
  21. False
  22. buzzer
  23. buzzer
  24. makes a beeping sound
  25. transistor
  26. True
  27. False
  28. fuse
  29. LED
  30. True
  31. thermistor
  32. motor
  33. is a resistance knob
  34. False
  35. True
  36. True
  37. turns a fan or wheels
  38. False
  39. False
  40. potentiometer

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