← Electronic components lesson New set →

Electronics Worksheet: Electronic Components

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

Answer key

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

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