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Electronics Worksheet: Electronic Components

Electronics lesson 17: Electronic components · Set 504 · 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.🧩 A capacitor in a circuit can … (a) measure heat (b) make light (c) store charge briefly (d) spin a wheel
  2. 2.True or false: an LDR lets current go one way. (a) False (b) True
  3. 3.🧩 Which part changes electrical energy into sound? (a) a resistor (b) a diode (c) a buzzer (d) a capacitor
  4. 4.True or false: a transistor has coloured bands. (a) True (b) False
  5. 5.🧩 Which part changes electrical energy into movement? (a) a fuse (b) a resistor (c) an LED (d) a motor
  6. 6.True or false: a thermistor lets current go one way. (a) True (b) False
  7. 7.🧩 Which component beeps for an alarm? (a) LDR (b) capacitor (c) buzzer (d) thermistor
  8. 8.True or false: a capacitor stores a little charge. (a) False (b) True
  9. 9.True or false: a buzzer smooths a wobbly supply. (a) True (b) False
  10. 10.True or false: a potentiometer senses how bright it is. (a) False (b) True
  11. 11.🧩 Which component blows if current is high? (a) fuse (b) buzzer (c) LDR (d) potentiometer
  12. 12.🧩 Which component glows using little power? (a) resistor (b) LED (c) transistor (d) buzzer
  13. 13.What does a motor do? (a) boosts a small signal (b) turns a fan or wheels (c) has coloured bands (d) senses how bright it is
  14. 14.🧩 Which component senses how bright it is? (a) motor (b) transistor (c) potentiometer (d) LDR
  15. 15.What does a transistor do? (a) has coloured bands (b) boosts a small signal (c) makes a beeping sound (d) stores a little charge
  16. 16.True or false: an LED limits the current. (a) True (b) False
  17. 17.True or false: a transistor blows if current is high. (a) False (b) True
  18. 18.True or false: a potentiometer is a resistance knob. (a) True (b) False
  19. 19.What does a potentiometer do? (a) makes a beeping sound (b) senses how hot it is (c) is a resistance knob (d) lets current go one way
  20. 20.🧩 Which component is a resistance knob? (a) resistor (b) potentiometer (c) transistor (d) LED
  21. 21.True or false: a capacitor blows if current is high. (a) True (b) False
  22. 22.🧩 Which component turns a fan or wheels? (a) LED (b) LDR (c) motor (d) potentiometer
  23. 23.What does a buzzer do? (a) makes a beeping sound (b) glows using little power (c) limits the current (d) lets current go one way
  24. 24.True or false: a motor smooths a wobbly supply. (a) True (b) False
  25. 25.True or false: a resistor is a resistance knob. (a) True (b) False
  26. 26.What does a motor do? (a) makes things spin (b) makes a beeping sound (c) limits the current (d) boosts a small signal
  27. 27.True or false: a diode makes things spin. (a) False (b) True
  28. 28.True or false: a motor makes a beeping sound. (a) True (b) False
  29. 29.True or false: a buzzer beeps for an alarm. (a) False (b) True
  30. 30.What does a capacitor do? (a) smooths a wobbly supply (b) makes things spin (c) limits the current (d) boosts a small signal
  31. 31.🧩 Which component limits the current? (a) resistor (b) LDR (c) potentiometer (d) fuse
  32. 32.True or false: a transistor boosts a small signal. (a) True (b) False
  33. 33.🧩 Which component has coloured bands? (a) LDR (b) fuse (c) capacitor (d) resistor
  34. 34.What does a thermistor do? (a) has coloured bands (b) smooths a wobbly supply (c) senses how hot it is (d) senses how bright it is
  35. 35.True or false: a diode beeps for an alarm. (a) True (b) False
  36. 36.True or false: a capacitor smooths a wobbly supply. (a) False (b) True
  37. 37.🧩 Which component senses how hot it is? (a) transistor (b) LDR (c) resistor (d) thermistor
  38. 38.🧩 Which component stores a little charge? (a) buzzer (b) LED (c) LDR (d) capacitor
  39. 39.True or false: a diode smooths a wobbly supply. (a) False (b) True
  40. 40.🧩 Which component boosts a small signal? (a) motor (b) potentiometer (c) LED (d) transistor

Answer key

  1. store charge briefly
  2. False
  3. a buzzer
  4. False
  5. a motor
  6. False
  7. buzzer
  8. True
  9. False
  10. False
  11. fuse
  12. LED
  13. turns a fan or wheels
  14. LDR
  15. boosts a small signal
  16. False
  17. False
  18. True
  19. is a resistance knob
  20. potentiometer
  21. False
  22. motor
  23. makes a beeping sound
  24. False
  25. False
  26. makes things spin
  27. False
  28. False
  29. True
  30. smooths a wobbly supply
  31. resistor
  32. True
  33. resistor
  34. senses how hot it is
  35. False
  36. True
  37. thermistor
  38. capacitor
  39. False
  40. transistor

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