← Electronic components lesson New set →

Electronics Worksheet: Electronic Components

Electronics lesson 17: Electronic components · Set 140 · 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 movement? (a) an LED (b) a fuse (c) a motor (d) a resistor
  2. 2.True or false: a potentiometer is a resistance knob. (a) False (b) True
  3. 3.🧩 Which component limits the current? (a) transistor (b) resistor (c) diode (d) potentiometer
  4. 4.🧩 Which component makes a beeping sound? (a) LDR (b) buzzer (c) capacitor (d) diode
  5. 5.🧩 Which component has coloured bands? (a) buzzer (b) fuse (c) resistor (d) LED
  6. 6.What does a buzzer do? (a) makes a beeping sound (b) has coloured bands (c) turns a fan or wheels (d) lets current go one way
  7. 7.🧩 Which component lets current go one way? (a) thermistor (b) diode (c) LED (d) capacitor
  8. 8.True or false: an LDR boosts a small signal. (a) True (b) False
  9. 9.True or false: a potentiometer makes things spin. (a) True (b) False
  10. 10.What does an LED do? (a) makes a beeping sound (b) has coloured bands (c) glows using little power (d) beeps for an alarm
  11. 11.🧩 A capacitor in a circuit can … (a) spin a wheel (b) make light (c) measure heat (d) store charge briefly
  12. 12.True or false: an LED is a resistance knob. (a) True (b) False
  13. 13.🧩 Which part changes electrical energy into sound? (a) a buzzer (b) a diode (c) a capacitor (d) a resistor
  14. 14.True or false: a fuse has coloured bands. (a) True (b) False
  15. 15.What does a fuse do? (a) lets current go one way (b) makes a beeping sound (c) blows if current is high (d) is a resistance knob
  16. 16.🧩 Which component senses how bright it is? (a) potentiometer (b) LED (c) LDR (d) buzzer
  17. 17.What does an LDR do? (a) senses how bright it is (b) is a resistance knob (c) turns a fan or wheels (d) limits the current
  18. 18.True or false: a thermistor has coloured bands. (a) False (b) True
  19. 19.True or false: a diode turns a fan or wheels. (a) False (b) True
  20. 20.What does a capacitor do? (a) stores a little charge (b) has coloured bands (c) turns a fan or wheels (d) makes things spin
  21. 21.True or false: a diode blows if current is high. (a) False (b) True
  22. 22.What does a diode do? (a) makes a beeping sound (b) glows using little power (c) smooths a wobbly supply (d) lets current go one way
  23. 23.🧩 Which component boosts a small signal? (a) fuse (b) LDR (c) transistor (d) motor
  24. 24.True or false: an LED glows using little power. (a) False (b) True
  25. 25.True or false: a transistor senses how hot it is. (a) True (b) False
  26. 26.What does a thermistor do? (a) senses how hot it is (b) limits the current (c) makes things spin (d) makes a beeping sound
  27. 27.🧩 Which component makes things spin? (a) LDR (b) motor (c) capacitor (d) transistor
  28. 28.🧩 Which component senses how hot it is? (a) resistor (b) capacitor (c) buzzer (d) thermistor
  29. 29.True or false: an LDR senses how bright it is. (a) False (b) True
  30. 30.What does a resistor do? (a) beeps for an alarm (b) senses how bright it is (c) turns a fan or wheels (d) has coloured bands
  31. 31.True or false: a potentiometer boosts a small signal. (a) False (b) True
  32. 32.🧩 Which component is a resistance knob? (a) resistor (b) capacitor (c) LED (d) potentiometer
  33. 33.True or false: a buzzer smooths a wobbly supply. (a) True (b) False
  34. 34.🧩 Which component beeps for an alarm? (a) thermistor (b) LED (c) buzzer (d) motor
  35. 35.True or false: a buzzer beeps for an alarm. (a) True (b) False
  36. 36.True or false: an LED makes things spin. (a) True (b) False
  37. 37.True or false: a buzzer makes a beeping sound. (a) True (b) False
  38. 38.True or false: a motor stores a little charge. (a) True (b) False
  39. 39.🧩 Which component stores a little charge? (a) thermistor (b) motor (c) LED (d) capacitor
  40. 40.True or false: a resistor has coloured bands. (a) True (b) False

Answer key

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

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