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Electronics Worksheet: Electronic Components

Electronics lesson 17: Electronic components · Set 134 · 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 capacitor stores a little charge. (a) False (b) True
  2. 2.🧩 Which component stores a little charge? (a) buzzer (b) diode (c) thermistor (d) capacitor
  3. 3.What does a fuse do? (a) lets current go one way (b) boosts a small signal (c) blows if current is high (d) makes things spin
  4. 4.What does a resistor do? (a) limits the current (b) lets current go one way (c) stores a little charge (d) is a resistance knob
  5. 5.🧩 A capacitor in a circuit can … (a) make light (b) measure heat (c) store charge briefly (d) spin a wheel
  6. 6.🧩 Which component senses how bright it is? (a) motor (b) transistor (c) resistor (d) LDR
  7. 7.True or false: a potentiometer is a resistance knob. (a) False (b) True
  8. 8.🧩 Which part changes electrical energy into movement? (a) a resistor (b) a fuse (c) an LED (d) a motor
  9. 9.True or false: a resistor has coloured bands. (a) True (b) False
  10. 10.What does an LDR do? (a) is a resistance knob (b) lets current go one way (c) makes a beeping sound (d) senses how bright it is
  11. 11.True or false: an LED makes a beeping sound. (a) False (b) True
  12. 12.True or false: a potentiometer glows using little power. (a) False (b) True
  13. 13.🧩 Which part changes electrical energy into sound? (a) a buzzer (b) a resistor (c) a diode (d) a capacitor
  14. 14.True or false: a resistor limits the current. (a) True (b) False
  15. 15.🧩 Which component boosts a small signal? (a) motor (b) capacitor (c) transistor (d) thermistor
  16. 16.True or false: a transistor lets current go one way. (a) True (b) False
  17. 17.True or false: an LDR smooths a wobbly supply. (a) True (b) False
  18. 18.True or false: a thermistor glows using little power. (a) False (b) True
  19. 19.True or false: a motor turns a fan or wheels. (a) True (b) False
  20. 20.What does a potentiometer do? (a) is a resistance knob (b) boosts a small signal (c) beeps for an alarm (d) has coloured bands
  21. 21.🧩 Which component smooths a wobbly supply? (a) motor (b) capacitor (c) fuse (d) transistor
  22. 22.True or false: an LED lets current go one way. (a) False (b) True
  23. 23.🧩 Which component makes things spin? (a) buzzer (b) fuse (c) motor (d) thermistor
  24. 24.True or false: a thermistor limits the current. (a) False (b) True
  25. 25.True or false: a thermistor senses how hot it is. (a) True (b) False
  26. 26.True or false: an LDR senses how bright it is. (a) True (b) False
  27. 27.🧩 Which component senses how hot it is? (a) potentiometer (b) resistor (c) buzzer (d) thermistor
  28. 28.True or false: a thermistor is a resistance knob. (a) False (b) True
  29. 29.What does a motor do? (a) makes things spin (b) limits the current (c) boosts a small signal (d) blows if current is high
  30. 30.🧩 Which component beeps for an alarm? (a) capacitor (b) buzzer (c) motor (d) LDR
  31. 31.True or false: a fuse blows if current is high. (a) False (b) True
  32. 32.What does a thermistor do? (a) makes a beeping sound (b) senses how hot it is (c) turns a fan or wheels (d) has coloured bands
  33. 33.What does a diode do? (a) blows if current is high (b) turns a fan or wheels (c) glows using little power (d) lets current go one way
  34. 34.🧩 Which component turns a fan or wheels? (a) capacitor (b) thermistor (c) buzzer (d) motor
  35. 35.True or false: a diode beeps for an alarm. (a) True (b) False
  36. 36.What does a capacitor do? (a) limits the current (b) beeps for an alarm (c) senses how bright it is (d) stores a little charge
  37. 37.True or false: a potentiometer makes a beeping sound. (a) False (b) True
  38. 38.🧩 Which component has coloured bands? (a) resistor (b) transistor (c) motor (d) capacitor
  39. 39.True or false: a buzzer beeps for an alarm. (a) False (b) True
  40. 40.True or false: an LED senses how hot it is. (a) True (b) False

Answer key

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

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