← Electronic components lesson New set →

Electronics Worksheet: Electronic Components

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

Answer key

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

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