← Electronic components lesson New set →

Electronics Worksheet: Electronic Components

Electronics lesson 17: Electronic components · Set 275 · 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 a capacitor do? (a) senses how bright it is (b) senses how hot it is (c) stores a little charge (d) limits the current
  2. 2.🧩 Which component smooths a wobbly supply? (a) thermistor (b) resistor (c) LDR (d) capacitor
  3. 3.🧩 Which component glows using little power? (a) capacitor (b) thermistor (c) LED (d) fuse
  4. 4.What does a thermistor do? (a) senses how hot it is (b) limits the current (c) blows if current is high (d) senses how bright it is
  5. 5.True or false: a motor makes things spin. (a) False (b) True
  6. 6.🧩 Which part changes electrical energy into movement? (a) a fuse (b) a resistor (c) a motor (d) an LED
  7. 7.🧩 Which component beeps for an alarm? (a) buzzer (b) thermistor (c) diode (d) resistor
  8. 8.What does a resistor do? (a) stores a little charge (b) makes things spin (c) lets current go one way (d) has coloured bands
  9. 9.🧩 Which component makes things spin? (a) LDR (b) capacitor (c) motor (d) resistor
  10. 10.🧩 Which component limits the current? (a) thermistor (b) buzzer (c) resistor (d) LED
  11. 11.🧩 Which component blows if current is high? (a) thermistor (b) LDR (c) diode (d) fuse
  12. 12.True or false: an LED is a resistance knob. (a) False (b) True
  13. 13.What does a capacitor do? (a) boosts a small signal (b) lets current go one way (c) makes things spin (d) smooths a wobbly supply
  14. 14.True or false: a transistor boosts a small signal. (a) True (b) False
  15. 15.🧩 Which component stores a little charge? (a) capacitor (b) diode (c) motor (d) buzzer
  16. 16.True or false: a capacitor stores a little charge. (a) True (b) False
  17. 17.What does an LDR do? (a) blows if current is high (b) senses how bright it is (c) boosts a small signal (d) has coloured bands
  18. 18.True or false: a resistor has coloured bands. (a) True (b) False
  19. 19.🧩 Which component senses how bright it is? (a) LED (b) LDR (c) diode (d) thermistor
  20. 20.True or false: a buzzer beeps for an alarm. (a) True (b) False
  21. 21.True or false: a thermistor senses how hot it is. (a) False (b) True
  22. 22.🧩 Which part changes electrical energy into sound? (a) a diode (b) a resistor (c) a capacitor (d) a buzzer
  23. 23.What does a fuse do? (a) turns a fan or wheels (b) blows if current is high (c) stores a little charge (d) has coloured bands
  24. 24.True or false: an LED blows if current is high. (a) True (b) False
  25. 25.🧩 A capacitor in a circuit can … (a) spin a wheel (b) make light (c) store charge briefly (d) measure heat
  26. 26.What does a motor do? (a) turns a fan or wheels (b) blows if current is high (c) has coloured bands (d) glows using little power
  27. 27.🧩 Which component makes a beeping sound? (a) motor (b) buzzer (c) fuse (d) capacitor
  28. 28.What does a transistor do? (a) senses how bright it is (b) has coloured bands (c) boosts a small signal (d) blows if current is high
  29. 29.What does an LED do? (a) is a resistance knob (b) has coloured bands (c) blows if current is high (d) glows using little power
  30. 30.🧩 Which component senses how hot it is? (a) motor (b) thermistor (c) capacitor (d) potentiometer
  31. 31.True or false: a capacitor beeps for an alarm. (a) False (b) True
  32. 32.True or false: a potentiometer beeps for an alarm. (a) True (b) False
  33. 33.🧩 Which component lets current go one way? (a) transistor (b) diode (c) thermistor (d) potentiometer
  34. 34.True or false: a diode smooths a wobbly supply. (a) True (b) False
  35. 35.True or false: an LED limits the current. (a) True (b) False
  36. 36.🧩 Which component boosts a small signal? (a) LED (b) buzzer (c) transistor (d) LDR
  37. 37.True or false: a fuse turns a fan or wheels. (a) True (b) False
  38. 38.True or false: a buzzer limits the current. (a) False (b) True
  39. 39.🧩 Which component is a resistance knob? (a) motor (b) potentiometer (c) resistor (d) capacitor
  40. 40.What does a buzzer do? (a) makes a beeping sound (b) stores a little charge (c) lets current go one way (d) smooths a wobbly supply

Answer key

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

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