Electronics Worksheet: Electronic Components

Electronics lesson 17: Electronic components · Set 78 · 40 questions

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.

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

Free electronics lessons, practice and worksheets at talentjr.in/electronics-for-kids