← Electronic components lesson New set →

Electronics Worksheet: Electronic Components

Electronics lesson 17: Electronic components · Set 59 · 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 resistor (b) a buzzer (c) a capacitor (d) a diode
  2. 2.🧩 Which component senses how bright it is? (a) motor (b) fuse (c) thermistor (d) LDR
  3. 3.True or false: a diode senses how bright it is. (a) False (b) True
  4. 4.True or false: an LDR senses how bright it is. (a) True (b) False
  5. 5.What does a transistor do? (a) lets current go one way (b) stores a little charge (c) boosts a small signal (d) blows if current is high
  6. 6.🧩 Which component stores a little charge? (a) transistor (b) diode (c) thermistor (d) capacitor
  7. 7.True or false: an LED blows if current is high. (a) True (b) False
  8. 8.🧩 A capacitor in a circuit can … (a) store charge briefly (b) spin a wheel (c) measure heat (d) make light
  9. 9.True or false: a capacitor has coloured bands. (a) True (b) False
  10. 10.True or false: an LED makes things spin. (a) False (b) True
  11. 11.🧩 Which part changes electrical energy into movement? (a) a resistor (b) an LED (c) a fuse (d) a motor
  12. 12.What does a diode do? (a) lets current go one way (b) makes things spin (c) has coloured bands (d) glows using little power
  13. 13.What does an LED do? (a) stores a little charge (b) boosts a small signal (c) limits the current (d) glows using little power
  14. 14.What does an LDR do? (a) beeps for an alarm (b) makes things spin (c) makes a beeping sound (d) senses how bright it is
  15. 15.What does a fuse do? (a) smooths a wobbly supply (b) senses how hot it is (c) blows if current is high (d) makes a beeping sound
  16. 16.🧩 Which component makes things spin? (a) motor (b) capacitor (c) buzzer (d) fuse
  17. 17.True or false: a capacitor stores a little charge. (a) False (b) True
  18. 18.🧩 Which component has coloured bands? (a) fuse (b) diode (c) resistor (d) potentiometer
  19. 19.True or false: a buzzer makes a beeping sound. (a) True (b) False
  20. 20.True or false: a motor turns a fan or wheels. (a) True (b) False
  21. 21.🧩 Which component boosts a small signal? (a) transistor (b) LED (c) buzzer (d) LDR
  22. 22.What does a buzzer do? (a) stores a little charge (b) senses how hot it is (c) limits the current (d) makes a beeping sound
  23. 23.🧩 Which component turns a fan or wheels? (a) potentiometer (b) diode (c) fuse (d) motor
  24. 24.True or false: a buzzer limits the current. (a) False (b) True
  25. 25.True or false: a thermistor is a resistance knob. (a) False (b) True
  26. 26.True or false: a resistor has coloured bands. (a) False (b) True
  27. 27.True or false: a thermistor senses how hot it is. (a) True (b) False
  28. 28.What does a capacitor do? (a) has coloured bands (b) turns a fan or wheels (c) smooths a wobbly supply (d) lets current go one way
  29. 29.🧩 Which component makes a beeping sound? (a) LED (b) diode (c) potentiometer (d) buzzer
  30. 30.True or false: an LDR senses how hot it is. (a) True (b) False
  31. 31.True or false: a motor is a resistance knob. (a) True (b) False
  32. 32.🧩 Which component smooths a wobbly supply? (a) resistor (b) thermistor (c) capacitor (d) diode
  33. 33.What does a potentiometer do? (a) blows if current is high (b) senses how hot it is (c) is a resistance knob (d) beeps for an alarm
  34. 34.🧩 Which component glows using little power? (a) LDR (b) diode (c) LED (d) fuse
  35. 35.🧩 Which component is a resistance knob? (a) buzzer (b) capacitor (c) potentiometer (d) transistor
  36. 36.True or false: a fuse senses how hot it is. (a) True (b) False
  37. 37.True or false: a resistor limits the current. (a) True (b) False
  38. 38.True or false: a potentiometer makes a beeping sound. (a) False (b) True
  39. 39.What does a resistor do? (a) lets current go one way (b) limits the current (c) makes things spin (d) smooths a wobbly supply
  40. 40.True or false: a fuse is a resistance knob. (a) True (b) False

Answer key

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

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