← Electronic components lesson New set →

Electronics Worksheet: Electronic Components

Electronics lesson 17: Electronic components · Set 358 · 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 component senses how bright it is? (a) LDR (b) buzzer (c) motor (d) capacitor
  2. 2.🧩 Which part changes electrical energy into sound? (a) a resistor (b) a buzzer (c) a capacitor (d) a diode
  3. 3.True or false: a capacitor has coloured bands. (a) True (b) False
  4. 4.🧩 A capacitor in a circuit can … (a) measure heat (b) store charge briefly (c) spin a wheel (d) make light
  5. 5.What does a diode do? (a) lets current go one way (b) glows using little power (c) smooths a wobbly supply (d) is a resistance knob
  6. 6.True or false: an LED has coloured bands. (a) True (b) False
  7. 7.What does a potentiometer do? (a) limits the current (b) makes things spin (c) is a resistance knob (d) lets current go one way
  8. 8.True or false: an LDR boosts a small signal. (a) False (b) True
  9. 9.🧩 Which component boosts a small signal? (a) transistor (b) thermistor (c) motor (d) LDR
  10. 10.🧩 Which component stores a little charge? (a) capacitor (b) diode (c) LDR (d) fuse
  11. 11.🧩 Which component makes things spin? (a) potentiometer (b) motor (c) capacitor (d) diode
  12. 12.🧩 Which part changes electrical energy into movement? (a) an LED (b) a resistor (c) a fuse (d) a motor
  13. 13.🧩 Which component limits the current? (a) LDR (b) potentiometer (c) resistor (d) buzzer
  14. 14.🧩 Which component turns a fan or wheels? (a) fuse (b) diode (c) motor (d) buzzer
  15. 15.What does an LDR do? (a) stores a little charge (b) senses how bright it is (c) blows if current is high (d) makes things spin
  16. 16.True or false: an LDR smooths a wobbly supply. (a) False (b) True
  17. 17.True or false: a fuse stores a little charge. (a) False (b) True
  18. 18.🧩 Which component senses how hot it is? (a) LDR (b) thermistor (c) LED (d) capacitor
  19. 19.What does a motor do? (a) smooths a wobbly supply (b) makes a beeping sound (c) senses how bright it is (d) turns a fan or wheels
  20. 20.True or false: a buzzer boosts a small signal. (a) False (b) True
  21. 21.🧩 Which component makes a beeping sound? (a) LED (b) resistor (c) LDR (d) buzzer
  22. 22.What does a resistor do? (a) glows using little power (b) has coloured bands (c) senses how hot it is (d) boosts a small signal
  23. 23.True or false: a capacitor glows using little power. (a) False (b) True
  24. 24.True or false: a transistor boosts a small signal. (a) False (b) True
  25. 25.True or false: an LDR senses how bright it is. (a) True (b) False
  26. 26.What does an LED do? (a) beeps for an alarm (b) glows using little power (c) blows if current is high (d) stores a little charge
  27. 27.🧩 Which component smooths a wobbly supply? (a) capacitor (b) motor (c) resistor (d) transistor
  28. 28.What does a resistor do? (a) limits the current (b) stores a little charge (c) makes a beeping sound (d) blows if current is high
  29. 29.What does a thermistor do? (a) has coloured bands (b) turns a fan or wheels (c) senses how hot it is (d) smooths a wobbly supply
  30. 30.🧩 Which component blows if current is high? (a) buzzer (b) resistor (c) fuse (d) LED
  31. 31.What does a capacitor do? (a) senses how bright it is (b) stores a little charge (c) limits the current (d) turns a fan or wheels
  32. 32.True or false: a transistor turns a fan or wheels. (a) True (b) False
  33. 33.What does a buzzer do? (a) turns a fan or wheels (b) has coloured bands (c) beeps for an alarm (d) boosts a small signal
  34. 34.🧩 Which component has coloured bands? (a) motor (b) buzzer (c) thermistor (d) resistor
  35. 35.True or false: a resistor limits the current. (a) False (b) True
  36. 36.True or false: an LDR turns a fan or wheels. (a) True (b) False
  37. 37.🧩 Which component beeps for an alarm? (a) buzzer (b) fuse (c) potentiometer (d) resistor
  38. 38.True or false: a motor smooths a wobbly supply. (a) False (b) True
  39. 39.True or false: a fuse blows if current is high. (a) True (b) False
  40. 40.True or false: a resistor glows using little power. (a) True (b) False

Answer key

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

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