← Electronic components lesson New set →

Electronics Worksheet: Electronic Components

Electronics lesson 17: Electronic components · Set 308 · 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 fuse do? (a) limits the current (b) boosts a small signal (c) turns a fan or wheels (d) blows if current is high
  2. 2.What does a resistor do? (a) senses how bright it is (b) is a resistance knob (c) beeps for an alarm (d) limits the current
  3. 3.🧩 Which part changes electrical energy into sound? (a) a capacitor (b) a buzzer (c) a diode (d) a resistor
  4. 4.🧩 Which component stores a little charge? (a) motor (b) transistor (c) LDR (d) capacitor
  5. 5.🧩 A capacitor in a circuit can … (a) spin a wheel (b) store charge briefly (c) make light (d) measure heat
  6. 6.True or false: a diode makes a beeping sound. (a) False (b) True
  7. 7.True or false: a buzzer senses how hot it is. (a) True (b) False
  8. 8.True or false: a capacitor stores a little charge. (a) True (b) False
  9. 9.What does a motor do? (a) smooths a wobbly supply (b) glows using little power (c) makes things spin (d) lets current go one way
  10. 10.What does a diode do? (a) senses how hot it is (b) makes things spin (c) smooths a wobbly supply (d) lets current go one way
  11. 11.What does an LDR do? (a) senses how bright it is (b) limits the current (c) boosts a small signal (d) beeps for an alarm
  12. 12.What does a buzzer do? (a) makes things spin (b) glows using little power (c) makes a beeping sound (d) turns a fan or wheels
  13. 13.What does an LED do? (a) boosts a small signal (b) glows using little power (c) has coloured bands (d) limits the current
  14. 14.🧩 Which component boosts a small signal? (a) thermistor (b) potentiometer (c) motor (d) transistor
  15. 15.🧩 Which component blows if current is high? (a) fuse (b) capacitor (c) transistor (d) motor
  16. 16.What does a capacitor do? (a) stores a little charge (b) limits the current (c) has coloured bands (d) is a resistance knob
  17. 17.True or false: a capacitor smooths a wobbly supply. (a) True (b) False
  18. 18.🧩 Which component glows using little power? (a) fuse (b) diode (c) LED (d) capacitor
  19. 19.True or false: a potentiometer senses how hot it is. (a) True (b) False
  20. 20.🧩 Which component is a resistance knob? (a) potentiometer (b) diode (c) motor (d) fuse
  21. 21.True or false: a buzzer makes a beeping sound. (a) False (b) True
  22. 22.True or false: an LED makes things spin. (a) False (b) True
  23. 23.True or false: an LED glows using little power. (a) True (b) False
  24. 24.What does a buzzer do? (a) makes things spin (b) beeps for an alarm (c) senses how hot it is (d) glows using little power
  25. 25.🧩 Which part changes electrical energy into movement? (a) a motor (b) a resistor (c) a fuse (d) an LED
  26. 26.What does a potentiometer do? (a) stores a little charge (b) is a resistance knob (c) senses how bright it is (d) blows if current is high
  27. 27.True or false: an LED smooths a wobbly supply. (a) False (b) True
  28. 28.True or false: a resistor limits the current. (a) False (b) True
  29. 29.True or false: a transistor blows if current is high. (a) False (b) True
  30. 30.🧩 Which component senses how hot it is? (a) potentiometer (b) LED (c) resistor (d) thermistor
  31. 31.True or false: a fuse smooths a wobbly supply. (a) True (b) False
  32. 32.🧩 Which component limits the current? (a) resistor (b) transistor (c) buzzer (d) diode
  33. 33.True or false: an LED limits the current. (a) True (b) False
  34. 34.What does a motor do? (a) turns a fan or wheels (b) senses how hot it is (c) makes a beeping sound (d) smooths a wobbly supply
  35. 35.What does a thermistor do? (a) senses how hot it is (b) glows using little power (c) senses how bright it is (d) makes things spin
  36. 36.🧩 Which component smooths a wobbly supply? (a) motor (b) diode (c) fuse (d) capacitor
  37. 37.True or false: a motor turns a fan or wheels. (a) False (b) True
  38. 38.True or false: an LDR makes things spin. (a) True (b) False
  39. 39.🧩 Which component has coloured bands? (a) motor (b) resistor (c) diode (d) LDR
  40. 40.True or false: a buzzer boosts a small signal. (a) True (b) False

Answer key

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

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