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Electronics Worksheet: Electronic Components

Electronics lesson 17: Electronic components · Set 340 · 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.What does an LDR do? (a) senses how bright it is (b) senses how hot it is (c) makes a beeping sound (d) glows using little power
  2. 2.🧩 A capacitor in a circuit can … (a) make light (b) spin a wheel (c) measure heat (d) store charge briefly
  3. 3.What does a thermistor do? (a) makes a beeping sound (b) smooths a wobbly supply (c) turns a fan or wheels (d) senses how hot it is
  4. 4.🧩 Which part changes electrical energy into sound? (a) a resistor (b) a buzzer (c) a diode (d) a capacitor
  5. 5.🧩 Which part changes electrical energy into movement? (a) a fuse (b) a resistor (c) a motor (d) an LED
  6. 6.True or false: a buzzer turns a fan or wheels. (a) True (b) False
  7. 7.What does a buzzer do? (a) limits the current (b) beeps for an alarm (c) blows if current is high (d) turns a fan or wheels
  8. 8.True or false: a potentiometer is a resistance knob. (a) False (b) True
  9. 9.True or false: a motor makes things spin. (a) True (b) False
  10. 10.True or false: a potentiometer senses how hot it is. (a) True (b) False
  11. 11.True or false: a resistor limits the current. (a) False (b) True
  12. 12.🧩 Which component blows if current is high? (a) motor (b) LED (c) fuse (d) capacitor
  13. 13.True or false: a resistor lets current go one way. (a) True (b) False
  14. 14.True or false: a capacitor stores a little charge. (a) False (b) True
  15. 15.🧩 Which component stores a little charge? (a) resistor (b) transistor (c) capacitor (d) diode
  16. 16.🧩 Which component glows using little power? (a) motor (b) LED (c) capacitor (d) resistor
  17. 17.What does a potentiometer do? (a) senses how hot it is (b) is a resistance knob (c) makes a beeping sound (d) turns a fan or wheels
  18. 18.🧩 Which component makes things spin? (a) motor (b) thermistor (c) fuse (d) transistor
  19. 19.True or false: a thermistor glows using little power. (a) True (b) False
  20. 20.🧩 Which component smooths a wobbly supply? (a) LDR (b) resistor (c) motor (d) capacitor
  21. 21.True or false: an LED boosts a small signal. (a) True (b) False
  22. 22.What does a motor do? (a) senses how hot it is (b) makes things spin (c) senses how bright it is (d) makes a beeping sound
  23. 23.🧩 Which component makes a beeping sound? (a) motor (b) buzzer (c) potentiometer (d) capacitor
  24. 24.What does an LED do? (a) has coloured bands (b) smooths a wobbly supply (c) glows using little power (d) makes things spin
  25. 25.🧩 Which component beeps for an alarm? (a) motor (b) resistor (c) buzzer (d) diode
  26. 26.True or false: a diode lets current go one way. (a) False (b) True
  27. 27.True or false: a thermistor limits the current. (a) False (b) True
  28. 28.True or false: a motor smooths a wobbly supply. (a) True (b) False
  29. 29.🧩 Which component senses how bright it is? (a) transistor (b) LED (c) motor (d) LDR
  30. 30.What does a diode do? (a) glows using little power (b) stores a little charge (c) is a resistance knob (d) lets current go one way
  31. 31.🧩 Which component limits the current? (a) buzzer (b) resistor (c) motor (d) transistor
  32. 32.True or false: a capacitor smooths a wobbly supply. (a) False (b) True
  33. 33.🧩 Which component lets current go one way? (a) diode (b) thermistor (c) LDR (d) fuse
  34. 34.🧩 Which component turns a fan or wheels? (a) motor (b) diode (c) thermistor (d) resistor
  35. 35.🧩 Which component senses how hot it is? (a) capacitor (b) resistor (c) thermistor (d) motor
  36. 36.True or false: an LED glows using little power. (a) True (b) False
  37. 37.True or false: an LED stores a little charge. (a) False (b) True
  38. 38.True or false: a fuse has coloured bands. (a) False (b) True
  39. 39.🧩 Which component has coloured bands? (a) capacitor (b) thermistor (c) buzzer (d) resistor
  40. 40.True or false: a buzzer makes a beeping sound. (a) False (b) True

Answer key

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

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