Electronics Worksheet: Electronic Components

Electronics lesson 17: Electronic components · Set 230 · 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.What does an LDR do? (a) limits the current (b) senses how bright it is (c) stores a little charge (d) smooths a wobbly supply
2. 2.🧩 Which part changes electrical energy into sound? (a) a buzzer (b) a capacitor (c) a resistor (d) a diode
3. 3.🧩 Which component blows if current is high? (a) fuse (b) transistor (c) capacitor (d) LDR
4. 4.🧩 A capacitor in a circuit can … (a) make light (b) measure heat (c) spin a wheel (d) store charge briefly
5. 5.True or false: an LED stores a little charge. (a) True (b) False
6. 6.🧩 Which component stores a little charge? (a) diode (b) potentiometer (c) capacitor (d) motor
7. 7.True or false: a buzzer beeps for an alarm. (a) False (b) True
8. 8.🧩 Which part changes electrical energy into movement? (a) a fuse (b) a resistor (c) an LED (d) a motor
9. 9.🧩 Which component lets current go one way? (a) fuse (b) resistor (c) diode (d) capacitor
10. 10.True or false: a motor blows if current is high. (a) True (b) False
11. 11.What does a motor do? (a) boosts a small signal (b) stores a little charge (c) makes a beeping sound (d) makes things spin
12. 12.🧩 Which component boosts a small signal? (a) motor (b) capacitor (c) transistor (d) buzzer
13. 13.🧩 Which component is a resistance knob? (a) transistor (b) resistor (c) potentiometer (d) thermistor
14. 14.🧩 Which component limits the current? (a) LDR (b) potentiometer (c) resistor (d) transistor
15. 15.What does a potentiometer do? (a) smooths a wobbly supply (b) limits the current (c) senses how hot it is (d) is a resistance knob
16. 16.What does an LED do? (a) is a resistance knob (b) glows using little power (c) makes a beeping sound (d) senses how hot it is
17. 17.True or false: an LED senses how hot it is. (a) False (b) True
18. 18.🧩 Which component senses how bright it is? (a) LDR (b) capacitor (c) motor (d) diode
19. 19.True or false: a fuse lets current go one way. (a) False (b) True
20. 20.True or false: a buzzer makes a beeping sound. (a) True (b) False
21. 21.True or false: a resistor has coloured bands. (a) True (b) False
22. 22.What does a motor do? (a) boosts a small signal (b) blows if current is high (c) turns a fan or wheels (d) smooths a wobbly supply
23. 23.🧩 Which component glows using little power? (a) transistor (b) diode (c) thermistor (d) LED
24. 24.What does a transistor do? (a) beeps for an alarm (b) has coloured bands (c) senses how bright it is (d) boosts a small signal
25. 25.What does a resistor do? (a) senses how bright it is (b) stores a little charge (c) limits the current (d) blows if current is high
26. 26.🧩 Which component makes things spin? (a) buzzer (b) capacitor (c) resistor (d) motor
27. 27.🧩 Which component has coloured bands? (a) motor (b) resistor (c) buzzer (d) LED
28. 28.True or false: an LDR boosts a small signal. (a) True (b) False
29. 29.🧩 Which component turns a fan or wheels? (a) buzzer (b) transistor (c) motor (d) potentiometer
30. 30.True or false: a capacitor limits the current. (a) False (b) True
31. 31.What does a capacitor do? (a) makes things spin (b) stores a little charge (c) turns a fan or wheels (d) blows if current is high
32. 32.What does a thermistor do? (a) lets current go one way (b) beeps for an alarm (c) senses how hot it is (d) blows if current is high
33. 33.True or false: a transistor boosts a small signal. (a) False (b) True
34. 34.🧩 Which component beeps for an alarm? (a) diode (b) capacitor (c) potentiometer (d) buzzer
35. 35.True or false: a fuse makes a beeping sound. (a) False (b) True
36. 36.What does a fuse do? (a) stores a little charge (b) glows using little power (c) blows if current is high (d) makes a beeping sound
37. 37.🧩 Which component makes a beeping sound? (a) buzzer (b) fuse (c) thermistor (d) capacitor
38. 38.True or false: an LED boosts a small signal. (a) True (b) False
39. 39.What does a diode do? (a) lets current go one way (b) is a resistance knob (c) smooths a wobbly supply (d) senses how bright it is
40. 40.🧩 Which component smooths a wobbly supply? (a) buzzer (b) LDR (c) capacitor (d) motor

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