← Electronic components lesson New set →

Electronics Worksheet: Electronic Components

Electronics lesson 17: Electronic components · Set 376 · 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.True or false: an LED smooths a wobbly supply. (a) False (b) True
  2. 2.What does a potentiometer do? (a) turns a fan or wheels (b) limits the current (c) is a resistance knob (d) lets current go one way
  3. 3.What does a capacitor do? (a) makes a beeping sound (b) beeps for an alarm (c) smooths a wobbly supply (d) limits the current
  4. 4.True or false: a capacitor stores a little charge. (a) False (b) True
  5. 5.🧩 Which component smooths a wobbly supply? (a) diode (b) buzzer (c) capacitor (d) resistor
  6. 6.🧩 Which component has coloured bands? (a) resistor (b) buzzer (c) transistor (d) LED
  7. 7.What does an LDR do? (a) senses how bright it is (b) has coloured bands (c) limits the current (d) turns a fan or wheels
  8. 8.🧩 Which part changes electrical energy into sound? (a) a capacitor (b) a resistor (c) a buzzer (d) a diode
  9. 9.🧩 Which component blows if current is high? (a) diode (b) buzzer (c) fuse (d) potentiometer
  10. 10.What does an LED do? (a) smooths a wobbly supply (b) turns a fan or wheels (c) glows using little power (d) blows if current is high
  11. 11.True or false: a capacitor smooths a wobbly supply. (a) True (b) False
  12. 12.🧩 Which part changes electrical energy into movement? (a) a motor (b) an LED (c) a fuse (d) a resistor
  13. 13.🧩 Which component boosts a small signal? (a) diode (b) transistor (c) capacitor (d) LED
  14. 14.🧩 Which component lets current go one way? (a) diode (b) transistor (c) LED (d) LDR
  15. 15.True or false: a motor makes things spin. (a) True (b) False
  16. 16.True or false: a potentiometer makes things spin. (a) False (b) True
  17. 17.🧩 Which component stores a little charge? (a) potentiometer (b) LED (c) thermistor (d) capacitor
  18. 18.True or false: a diode stores a little charge. (a) True (b) False
  19. 19.🧩 A capacitor in a circuit can … (a) make light (b) measure heat (c) store charge briefly (d) spin a wheel
  20. 20.What does a fuse do? (a) senses how hot it is (b) boosts a small signal (c) blows if current is high (d) turns a fan or wheels
  21. 21.What does a diode do? (a) smooths a wobbly supply (b) senses how hot it is (c) lets current go one way (d) glows using little power
  22. 22.🧩 Which component glows using little power? (a) LED (b) motor (c) buzzer (d) potentiometer
  23. 23.🧩 Which component makes things spin? (a) thermistor (b) potentiometer (c) transistor (d) motor
  24. 24.True or false: a potentiometer is a resistance knob. (a) True (b) False
  25. 25.What does a resistor do? (a) stores a little charge (b) makes a beeping sound (c) senses how hot it is (d) has coloured bands
  26. 26.True or false: a buzzer beeps for an alarm. (a) True (b) False
  27. 27.True or false: a resistor limits the current. (a) False (b) True
  28. 28.True or false: a diode has coloured bands. (a) True (b) False
  29. 29.True or false: a motor turns a fan or wheels. (a) True (b) False
  30. 30.True or false: a diode blows if current is high. (a) False (b) True
  31. 31.🧩 Which component turns a fan or wheels? (a) potentiometer (b) transistor (c) motor (d) LED
  32. 32.True or false: an LED turns a fan or wheels. (a) True (b) False
  33. 33.What does a thermistor do? (a) makes a beeping sound (b) is a resistance knob (c) senses how hot it is (d) turns a fan or wheels
  34. 34.True or false: a thermistor senses how hot it is. (a) False (b) True
  35. 35.What does a buzzer do? (a) has coloured bands (b) boosts a small signal (c) blows if current is high (d) makes a beeping sound
  36. 36.True or false: a motor smooths a wobbly supply. (a) False (b) True
  37. 37.True or false: a buzzer smooths a wobbly supply. (a) False (b) True
  38. 38.True or false: a resistor has coloured bands. (a) False (b) True
  39. 39.What does a motor do? (a) senses how hot it is (b) lets current go one way (c) beeps for an alarm (d) turns a fan or wheels
  40. 40.🧩 Which component senses how bright it is? (a) diode (b) buzzer (c) LDR (d) LED

Answer key

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

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