Electronics Worksheet: Electronic Components

Electronics lesson 17: Electronic components · Set 249 · 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) measure heat (b) make light (c) store charge briefly (d) spin a wheel
2. 2.What does a diode do? (a) beeps for an alarm (b) glows using little power (c) lets current go one way (d) makes things spin
3. 3.🧩 Which part changes electrical energy into sound? (a) a resistor (b) a capacitor (c) a buzzer (d) a diode
4. 4.🧩 Which component has coloured bands? (a) potentiometer (b) buzzer (c) LDR (d) resistor
5. 5.What does a fuse do? (a) makes a beeping sound (b) is a resistance knob (c) blows if current is high (d) has coloured bands
6. 6.True or false: a transistor smooths a wobbly supply. (a) True (b) False
7. 7.🧩 Which component glows using little power? (a) resistor (b) transistor (c) potentiometer (d) LED
8. 8.🧩 Which component boosts a small signal? (a) LDR (b) transistor (c) buzzer (d) resistor
9. 9.What does a buzzer do? (a) senses how bright it is (b) beeps for an alarm (c) has coloured bands (d) glows using little power
10. 10.🧩 Which component smooths a wobbly supply? (a) thermistor (b) motor (c) capacitor (d) buzzer
11. 11.🧩 Which component turns a fan or wheels? (a) LDR (b) buzzer (c) motor (d) fuse
12. 12.What does a transistor do? (a) blows if current is high (b) is a resistance knob (c) senses how hot it is (d) boosts a small signal
13. 13.🧩 Which component stores a little charge? (a) buzzer (b) resistor (c) capacitor (d) diode
14. 14.True or false: a potentiometer boosts a small signal. (a) True (b) False
15. 15.True or false: a capacitor limits the current. (a) False (b) True
16. 16.🧩 Which component makes things spin? (a) diode (b) transistor (c) thermistor (d) motor
17. 17.What does a potentiometer do? (a) blows if current is high (b) is a resistance knob (c) stores a little charge (d) senses how bright it is
18. 18.🧩 Which component senses how hot it is? (a) motor (b) thermistor (c) capacitor (d) fuse
19. 19.🧩 Which component is a resistance knob? (a) resistor (b) thermistor (c) potentiometer (d) fuse
20. 20.🧩 Which part changes electrical energy into movement? (a) a resistor (b) a motor (c) a fuse (d) an LED
21. 21.What does an LED do? (a) smooths a wobbly supply (b) turns a fan or wheels (c) glows using little power (d) has coloured bands
22. 22.What does a resistor do? (a) is a resistance knob (b) blows if current is high (c) lets current go one way (d) has coloured bands
23. 23.What does a resistor do? (a) stores a little charge (b) limits the current (c) makes a beeping sound (d) lets current go one way
24. 24.🧩 Which component beeps for an alarm? (a) LDR (b) buzzer (c) potentiometer (d) fuse
25. 25.🧩 Which component makes a beeping sound? (a) thermistor (b) potentiometer (c) buzzer (d) fuse
26. 26.True or false: a thermistor glows using little power. (a) True (b) False
27. 27.🧩 Which component limits the current? (a) buzzer (b) motor (c) resistor (d) thermistor
28. 28.What does a buzzer do? (a) lets current go one way (b) makes a beeping sound (c) senses how hot it is (d) limits the current
29. 29.What does an LDR do? (a) senses how bright it is (b) blows if current is high (c) beeps for an alarm (d) boosts a small signal
30. 30.🧩 A capacitor in a circuit can … (a) spin a wheel (b) make light (c) measure heat (d) store charge briefly
31. 31.What does a motor do? (a) blows if current is high (b) beeps for an alarm (c) makes things spin (d) has coloured bands
32. 32.🧩 Which component senses how bright it is? (a) potentiometer (b) motor (c) LDR (d) fuse
33. 33.True or false: a capacitor lets current go one way. (a) True (b) False
34. 34.True or false: a fuse boosts a small signal. (a) True (b) False
35. 35.🧩 Which component lets current go one way? (a) LED (b) resistor (c) diode (d) capacitor
36. 36.True or false: a buzzer beeps for an alarm. (a) False (b) True
37. 37.What does a capacitor do? (a) boosts a small signal (b) senses how bright it is (c) beeps for an alarm (d) smooths a wobbly supply
38. 38.True or false: a transistor is a resistance knob. (a) True (b) False
39. 39.True or false: an LED smooths a wobbly supply. (a) False (b) True
40. 40.True or false: an LED glows using little power. (a) True (b) False

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