← Electronic components lesson New set →

Electronics Worksheet: Electronic Components

Electronics lesson 17: Electronic components · Set 631 · 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.What does an LED do? (a) glows using little power (b) is a resistance knob (c) makes a beeping sound (d) beeps for an alarm
  2. 2.What does a diode do? (a) makes a beeping sound (b) makes things spin (c) lets current go one way (d) boosts a small signal
  3. 3.🧩 A capacitor in a circuit can … (a) measure heat (b) make light (c) store charge briefly (d) spin a wheel
  4. 4.True or false: a buzzer stores a little charge. (a) False (b) True
  5. 5.True or false: a motor makes things spin. (a) True (b) False
  6. 6.What does a thermistor do? (a) makes a beeping sound (b) stores a little charge (c) turns a fan or wheels (d) senses how hot it is
  7. 7.True or false: a thermistor smooths a wobbly supply. (a) True (b) False
  8. 8.What does a buzzer do? (a) makes a beeping sound (b) has coloured bands (c) lets current go one way (d) makes things spin
  9. 9.🧩 Which component senses how bright it is? (a) fuse (b) LED (c) diode (d) LDR
  10. 10.🧩 Which component makes a beeping sound? (a) thermistor (b) LED (c) buzzer (d) LDR
  11. 11.True or false: a potentiometer is a resistance knob. (a) True (b) False
  12. 12.True or false: a potentiometer smooths a wobbly supply. (a) False (b) True
  13. 13.True or false: a transistor limits the current. (a) True (b) False
  14. 14.True or false: a potentiometer senses how hot it is. (a) False (b) True
  15. 15.What does a buzzer do? (a) limits the current (b) stores a little charge (c) boosts a small signal (d) beeps for an alarm
  16. 16.🧩 Which component smooths a wobbly supply? (a) transistor (b) buzzer (c) capacitor (d) motor
  17. 17.True or false: a resistor limits the current. (a) False (b) True
  18. 18.What does an LDR do? (a) stores a little charge (b) makes a beeping sound (c) senses how bright it is (d) glows using little power
  19. 19.🧩 Which part changes electrical energy into sound? (a) a diode (b) a resistor (c) a capacitor (d) a buzzer
  20. 20.🧩 Which part changes electrical energy into movement? (a) a motor (b) a fuse (c) an LED (d) a resistor
  21. 21.🧩 Which component glows using little power? (a) potentiometer (b) motor (c) LED (d) buzzer
  22. 22.True or false: an LDR stores a little charge. (a) True (b) False
  23. 23.True or false: a potentiometer makes things spin. (a) True (b) False
  24. 24.True or false: an LDR makes things spin. (a) True (b) False
  25. 25.What does a resistor do? (a) stores a little charge (b) boosts a small signal (c) limits the current (d) senses how bright it is
  26. 26.True or false: a fuse makes things spin. (a) True (b) False
  27. 27.What does a fuse do? (a) senses how hot it is (b) blows if current is high (c) lets current go one way (d) is a resistance knob
  28. 28.What does a motor do? (a) turns a fan or wheels (b) senses how hot it is (c) is a resistance knob (d) beeps for an alarm
  29. 29.🧩 Which component makes things spin? (a) transistor (b) buzzer (c) motor (d) resistor
  30. 30.What does a transistor do? (a) smooths a wobbly supply (b) boosts a small signal (c) stores a little charge (d) makes things spin
  31. 31.What does a potentiometer do? (a) beeps for an alarm (b) senses how hot it is (c) stores a little charge (d) is a resistance knob
  32. 32.🧩 Which component has coloured bands? (a) resistor (b) motor (c) potentiometer (d) LDR
  33. 33.True or false: a fuse blows if current is high. (a) True (b) False
  34. 34.True or false: a resistor stores a little charge. (a) False (b) True
  35. 35.🧩 Which component is a resistance knob? (a) capacitor (b) potentiometer (c) LDR (d) LED
  36. 36.🧩 Which component beeps for an alarm? (a) thermistor (b) buzzer (c) capacitor (d) transistor
  37. 37.True or false: a transistor makes a beeping sound. (a) True (b) False
  38. 38.What does a capacitor do? (a) glows using little power (b) smooths a wobbly supply (c) makes things spin (d) has coloured bands
  39. 39.True or false: a buzzer glows using little power. (a) True (b) False
  40. 40.True or false: a capacitor stores a little charge. (a) True (b) False

Answer key

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

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