← Electronic components lesson New set →

Electronics Worksheet: Electronic Components

Electronics lesson 17: Electronic components · Set 342 · 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.🧩 A capacitor in a circuit can … (a) spin a wheel (b) measure heat (c) make light (d) store charge briefly
  2. 2.🧩 Which part changes electrical energy into movement? (a) a resistor (b) a motor (c) an LED (d) a fuse
  3. 3.🧩 Which part changes electrical energy into sound? (a) a diode (b) a resistor (c) a capacitor (d) a buzzer
  4. 4.What does a diode do? (a) has coloured bands (b) lets current go one way (c) smooths a wobbly supply (d) glows using little power
  5. 5.🧩 Which component lets current go one way? (a) fuse (b) potentiometer (c) diode (d) motor
  6. 6.🧩 Which component is a resistance knob? (a) potentiometer (b) LED (c) diode (d) capacitor
  7. 7.What does a buzzer do? (a) makes a beeping sound (b) smooths a wobbly supply (c) has coloured bands (d) blows if current is high
  8. 8.What does a thermistor do? (a) senses how hot it is (b) beeps for an alarm (c) has coloured bands (d) senses how bright it is
  9. 9.🧩 Which component blows if current is high? (a) transistor (b) fuse (c) LDR (d) motor
  10. 10.🧩 Which component has coloured bands? (a) thermistor (b) resistor (c) fuse (d) motor
  11. 11.True or false: a capacitor smooths a wobbly supply. (a) False (b) True
  12. 12.🧩 Which component boosts a small signal? (a) resistor (b) fuse (c) buzzer (d) transistor
  13. 13.What does a resistor do? (a) makes a beeping sound (b) turns a fan or wheels (c) limits the current (d) senses how bright it is
  14. 14.True or false: a potentiometer is a resistance knob. (a) False (b) True
  15. 15.🧩 Which component smooths a wobbly supply? (a) transistor (b) potentiometer (c) LED (d) capacitor
  16. 16.True or false: a transistor senses how bright it is. (a) True (b) False
  17. 17.What does a motor do? (a) makes things spin (b) beeps for an alarm (c) stores a little charge (d) lets current go one way
  18. 18.True or false: a resistor senses how hot it is. (a) True (b) False
  19. 19.What does a capacitor do? (a) stores a little charge (b) senses how bright it is (c) limits the current (d) turns a fan or wheels
  20. 20.What does an LED do? (a) glows using little power (b) senses how bright it is (c) boosts a small signal (d) senses how hot it is
  21. 21.True or false: a diode has coloured bands. (a) True (b) False
  22. 22.What does a transistor do? (a) senses how hot it is (b) smooths a wobbly supply (c) limits the current (d) boosts a small signal
  23. 23.True or false: an LED glows using little power. (a) True (b) False
  24. 24.🧩 Which component stores a little charge? (a) capacitor (b) resistor (c) buzzer (d) diode
  25. 25.True or false: a buzzer makes a beeping sound. (a) True (b) False
  26. 26.True or false: a fuse senses how bright it is. (a) False (b) True
  27. 27.True or false: a thermistor senses how hot it is. (a) True (b) False
  28. 28.True or false: a motor turns a fan or wheels. (a) False (b) True
  29. 29.🧩 Which component limits the current? (a) buzzer (b) resistor (c) LED (d) diode
  30. 30.True or false: a fuse makes a beeping sound. (a) True (b) False
  31. 31.What does a resistor do? (a) makes things spin (b) has coloured bands (c) makes a beeping sound (d) smooths a wobbly supply
  32. 32.🧩 Which component senses how hot it is? (a) capacitor (b) potentiometer (c) thermistor (d) LED
  33. 33.True or false: an LED has coloured bands. (a) False (b) True
  34. 34.🧩 Which component turns a fan or wheels? (a) diode (b) potentiometer (c) motor (d) resistor
  35. 35.True or false: an LED lets current go one way. (a) False (b) True
  36. 36.🧩 Which component beeps for an alarm? (a) diode (b) buzzer (c) resistor (d) fuse
  37. 37.🧩 Which component makes a beeping sound? (a) capacitor (b) LED (c) fuse (d) buzzer
  38. 38.What does a fuse do? (a) blows if current is high (b) has coloured bands (c) senses how hot it is (d) senses how bright it is
  39. 39.What does an LDR do? (a) senses how bright it is (b) beeps for an alarm (c) makes things spin (d) senses how hot it is
  40. 40.🧩 Which component senses how bright it is? (a) capacitor (b) motor (c) LDR (d) thermistor

Answer key

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

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