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Electronics Worksheet: Electronic Components

Electronics lesson 17: Electronic components · Set 419 · 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) is a resistance knob (b) lets current go one way (c) glows using little power (d) senses how bright it is
  2. 2.🧩 A capacitor in a circuit can … (a) store charge briefly (b) measure heat (c) make light (d) spin a wheel
  3. 3.🧩 Which component glows using little power? (a) motor (b) LED (c) LDR (d) diode
  4. 4.What does a transistor do? (a) senses how hot it is (b) smooths a wobbly supply (c) makes a beeping sound (d) boosts a small signal
  5. 5.🧩 Which component senses how hot it is? (a) buzzer (b) resistor (c) thermistor (d) motor
  6. 6.True or false: a motor blows if current is high. (a) False (b) True
  7. 7.What does a thermistor do? (a) turns a fan or wheels (b) stores a little charge (c) smooths a wobbly supply (d) senses how hot it is
  8. 8.🧩 Which part changes electrical energy into movement? (a) a resistor (b) an LED (c) a fuse (d) a motor
  9. 9.True or false: an LED blows if current is high. (a) False (b) True
  10. 10.What does a potentiometer do? (a) glows using little power (b) stores a little charge (c) is a resistance knob (d) senses how hot it is
  11. 11.True or false: a resistor has coloured bands. (a) True (b) False
  12. 12.What does an LED do? (a) turns a fan or wheels (b) glows using little power (c) smooths a wobbly supply (d) is a resistance knob
  13. 13.What does a buzzer do? (a) makes things spin (b) turns a fan or wheels (c) blows if current is high (d) makes a beeping sound
  14. 14.True or false: a capacitor stores a little charge. (a) False (b) True
  15. 15.True or false: an LDR senses how bright it is. (a) False (b) True
  16. 16.🧩 Which component stores a little charge? (a) potentiometer (b) transistor (c) diode (d) capacitor
  17. 17.What does a fuse do? (a) is a resistance knob (b) smooths a wobbly supply (c) makes things spin (d) blows if current is high
  18. 18.True or false: an LDR makes things spin. (a) True (b) False
  19. 19.🧩 Which component makes things spin? (a) motor (b) transistor (c) diode (d) resistor
  20. 20.🧩 Which part changes electrical energy into sound? (a) a resistor (b) a buzzer (c) a capacitor (d) a diode
  21. 21.What does a capacitor do? (a) senses how bright it is (b) beeps for an alarm (c) smooths a wobbly supply (d) limits the current
  22. 22.True or false: a fuse is a resistance knob. (a) True (b) False
  23. 23.What does a motor do? (a) makes a beeping sound (b) stores a little charge (c) boosts a small signal (d) turns a fan or wheels
  24. 24.True or false: a transistor stores a little charge. (a) True (b) False
  25. 25.True or false: a potentiometer is a resistance knob. (a) False (b) True
  26. 26.🧩 Which component is a resistance knob? (a) resistor (b) potentiometer (c) motor (d) thermistor
  27. 27.🧩 Which component makes a beeping sound? (a) LDR (b) transistor (c) capacitor (d) buzzer
  28. 28.🧩 Which component boosts a small signal? (a) transistor (b) resistor (c) LDR (d) buzzer
  29. 29.True or false: an LED glows using little power. (a) False (b) True
  30. 30.True or false: a thermistor senses how bright it is. (a) True (b) False
  31. 31.True or false: a capacitor is a resistance knob. (a) True (b) False
  32. 32.🧩 Which component beeps for an alarm? (a) buzzer (b) capacitor (c) LDR (d) fuse
  33. 33.True or false: a resistor makes things spin. (a) True (b) False
  34. 34.🧩 Which component limits the current? (a) buzzer (b) resistor (c) diode (d) transistor
  35. 35.True or false: an LDR limits the current. (a) False (b) True
  36. 36.True or false: an LED beeps for an alarm. (a) True (b) False
  37. 37.What does a motor do? (a) lets current go one way (b) makes things spin (c) glows using little power (d) smooths a wobbly supply
  38. 38.🧩 Which component smooths a wobbly supply? (a) fuse (b) buzzer (c) transistor (d) capacitor
  39. 39.What does a capacitor do? (a) beeps for an alarm (b) makes things spin (c) has coloured bands (d) stores a little charge
  40. 40.🧩 Which component has coloured bands? (a) resistor (b) buzzer (c) transistor (d) LDR

Answer key

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

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