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Electronics Worksheet: Electronic Components

Electronics lesson 17: Electronic components · Set 421 · 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.True or false: a fuse blows if current is high. (a) True (b) False
  2. 2.True or false: a transistor smooths a wobbly supply. (a) False (b) True
  3. 3.🧩 Which part changes electrical energy into sound? (a) a resistor (b) a capacitor (c) a diode (d) a buzzer
  4. 4.🧩 A capacitor in a circuit can … (a) store charge briefly (b) make light (c) measure heat (d) spin a wheel
  5. 5.🧩 Which component glows using little power? (a) transistor (b) thermistor (c) diode (d) LED
  6. 6.What does a capacitor do? (a) stores a little charge (b) lets current go one way (c) beeps for an alarm (d) limits the current
  7. 7.🧩 Which part changes electrical energy into movement? (a) a resistor (b) a fuse (c) an LED (d) a motor
  8. 8.What does a potentiometer do? (a) senses how hot it is (b) blows if current is high (c) boosts a small signal (d) is a resistance knob
  9. 9.🧩 Which component lets current go one way? (a) diode (b) potentiometer (c) resistor (d) capacitor
  10. 10.What does a resistor do? (a) stores a little charge (b) senses how bright it is (c) has coloured bands (d) turns a fan or wheels
  11. 11.🧩 Which component senses how hot it is? (a) motor (b) transistor (c) thermistor (d) LED
  12. 12.True or false: a thermistor senses how hot it is. (a) False (b) True
  13. 13.What does an LED do? (a) glows using little power (b) is a resistance knob (c) stores a little charge (d) makes things spin
  14. 14.True or false: a buzzer beeps for an alarm. (a) False (b) True
  15. 15.🧩 Which component senses how bright it is? (a) LDR (b) LED (c) motor (d) resistor
  16. 16.🧩 Which component is a resistance knob? (a) diode (b) buzzer (c) fuse (d) potentiometer
  17. 17.True or false: a resistor limits the current. (a) False (b) True
  18. 18.🧩 Which component makes a beeping sound? (a) transistor (b) buzzer (c) motor (d) LED
  19. 19.🧩 Which component turns a fan or wheels? (a) diode (b) motor (c) LED (d) capacitor
  20. 20.True or false: a thermistor turns a fan or wheels. (a) False (b) True
  21. 21.What does a capacitor do? (a) is a resistance knob (b) limits the current (c) smooths a wobbly supply (d) senses how bright it is
  22. 22.True or false: a potentiometer is a resistance knob. (a) True (b) False
  23. 23.What does a transistor do? (a) is a resistance knob (b) boosts a small signal (c) senses how bright it is (d) stores a little charge
  24. 24.🧩 Which component boosts a small signal? (a) potentiometer (b) LDR (c) LED (d) transistor
  25. 25.True or false: a transistor boosts a small signal. (a) True (b) False
  26. 26.🧩 Which component makes things spin? (a) thermistor (b) LDR (c) transistor (d) motor
  27. 27.What does a buzzer do? (a) turns a fan or wheels (b) senses how hot it is (c) senses how bright it is (d) makes a beeping sound
  28. 28.🧩 Which component smooths a wobbly supply? (a) LDR (b) diode (c) capacitor (d) fuse
  29. 29.What does a motor do? (a) boosts a small signal (b) turns a fan or wheels (c) senses how hot it is (d) limits the current
  30. 30.True or false: a capacitor stores a little charge. (a) False (b) True
  31. 31.True or false: a thermistor stores a little charge. (a) True (b) False
  32. 32.🧩 Which component has coloured bands? (a) resistor (b) transistor (c) motor (d) thermistor
  33. 33.True or false: a motor turns a fan or wheels. (a) True (b) False
  34. 34.True or false: an LDR turns a fan or wheels. (a) False (b) True
  35. 35.🧩 Which component makes a beeping sound? (a) buzzer (b) thermistor (c) motor (d) fuse
  36. 36.🧩 Which component beeps for an alarm? (a) thermistor (b) LED (c) buzzer (d) fuse
  37. 37.True or false: a transistor senses how hot it is. (a) True (b) False
  38. 38.What does a thermistor do? (a) lets current go one way (b) is a resistance knob (c) beeps for an alarm (d) senses how hot it is
  39. 39.True or false: a capacitor senses how hot it is. (a) True (b) False
  40. 40.🧩 Which component limits the current? (a) motor (b) potentiometer (c) thermistor (d) resistor

Answer key

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

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