Electronics Worksheet: Electronic Components

Electronics lesson 17: Electronic components · Set 81 · 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.🧩 Which component smooths a wobbly supply? (a) capacitor (b) diode (c) potentiometer (d) transistor
2. 2.True or false: a resistor limits the current. (a) False (b) True
3. 3.🧩 Which component stores a little charge? (a) LED (b) transistor (c) thermistor (d) capacitor
4. 4.True or false: a buzzer makes a beeping sound. (a) False (b) True
5. 5.🧩 Which component turns a fan or wheels? (a) buzzer (b) resistor (c) motor (d) fuse
6. 6.What does a thermistor do? (a) senses how hot it is (b) glows using little power (c) smooths a wobbly supply (d) beeps for an alarm
7. 7.🧩 Which component has coloured bands? (a) LDR (b) LED (c) motor (d) resistor
8. 8.What does a resistor do? (a) glows using little power (b) turns a fan or wheels (c) senses how bright it is (d) limits the current
9. 9.True or false: a buzzer beeps for an alarm. (a) True (b) False
10. 10.🧩 A capacitor in a circuit can … (a) make light (b) spin a wheel (c) store charge briefly (d) measure heat
11. 11.🧩 Which component makes a beeping sound? (a) capacitor (b) buzzer (c) LDR (d) fuse
12. 12.🧩 Which component beeps for an alarm? (a) resistor (b) LED (c) motor (d) buzzer
13. 13.True or false: a diode lets current go one way. (a) False (b) True
14. 14.What does a motor do? (a) limits the current (b) beeps for an alarm (c) smooths a wobbly supply (d) makes things spin
15. 15.🧩 Which component boosts a small signal? (a) LED (b) potentiometer (c) transistor (d) capacitor
16. 16.🧩 Which component limits the current? (a) diode (b) resistor (c) transistor (d) LDR
17. 17.What does a fuse do? (a) limits the current (b) boosts a small signal (c) blows if current is high (d) turns a fan or wheels
18. 18.🧩 Which part changes electrical energy into movement? (a) an LED (b) a motor (c) a resistor (d) a fuse
19. 19.🧩 Which component glows using little power? (a) diode (b) LED (c) capacitor (d) resistor
20. 20.🧩 Which component lets current go one way? (a) transistor (b) diode (c) LED (d) potentiometer
21. 21.True or false: a thermistor smooths a wobbly supply. (a) True (b) False
22. 22.True or false: a diode turns a fan or wheels. (a) False (b) True
23. 23.🧩 Which component blows if current is high? (a) thermistor (b) fuse (c) capacitor (d) transistor
24. 24.What does a diode do? (a) makes things spin (b) stores a little charge (c) beeps for an alarm (d) lets current go one way
25. 25.🧩 Which component makes things spin? (a) motor (b) LDR (c) buzzer (d) transistor
26. 26.True or false: a motor turns a fan or wheels. (a) False (b) True
27. 27.What does a capacitor do? (a) is a resistance knob (b) smooths a wobbly supply (c) boosts a small signal (d) blows if current is high
28. 28.What does an LDR do? (a) stores a little charge (b) has coloured bands (c) blows if current is high (d) senses how bright it is
29. 29.🧩 Which component is a resistance knob? (a) resistor (b) LED (c) potentiometer (d) capacitor
30. 30.What does a capacitor do? (a) has coloured bands (b) makes a beeping sound (c) stores a little charge (d) lets current go one way
31. 31.🧩 Which component senses how hot it is? (a) LDR (b) thermistor (c) motor (d) potentiometer
32. 32.🧩 Which component senses how bright it is? (a) fuse (b) resistor (c) diode (d) LDR
33. 33.What does a transistor do? (a) limits the current (b) boosts a small signal (c) senses how bright it is (d) smooths a wobbly supply
34. 34.True or false: an LED senses how hot it is. (a) True (b) False
35. 35.What does a buzzer do? (a) senses how bright it is (b) makes a beeping sound (c) stores a little charge (d) is a resistance knob
36. 36.True or false: a thermistor stores a little charge. (a) False (b) True
37. 37.🧩 Which part changes electrical energy into sound? (a) a capacitor (b) a diode (c) a buzzer (d) a resistor
38. 38.True or false: a diode makes things spin. (a) True (b) False
39. 39.What does a potentiometer do? (a) is a resistance knob (b) has coloured bands (c) makes a beeping sound (d) boosts a small signal
40. 40.True or false: a fuse blows if current is high. (a) False (b) True

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