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Electronics Worksheet: Electronic Components

Electronics lesson 17: Electronic components · Set 45 · 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.

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

Answer key

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

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