Electronics Worksheet: Electronic Components

Electronics lesson 17: Electronic components · Set 456 · 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) is a resistance knob (b) smooths a wobbly supply (c) senses how bright it is (d) limits the current
2. 2.True or false: a fuse blows if current is high. (a) False (b) True
3. 3.What does an LED do? (a) glows using little power (b) smooths a wobbly supply (c) beeps for an alarm (d) makes a beeping sound
4. 4.What does a buzzer do? (a) beeps for an alarm (b) blows if current is high (c) limits the current (d) makes things spin
5. 5.🧩 Which component has coloured bands? (a) buzzer (b) resistor (c) LDR (d) capacitor
6. 6.True or false: a capacitor stores a little charge. (a) False (b) True
7. 7.What does a resistor do? (a) stores a little charge (b) limits the current (c) senses how hot it is (d) smooths a wobbly supply
8. 8.🧩 Which component smooths a wobbly supply? (a) fuse (b) capacitor (c) buzzer (d) resistor
9. 9.True or false: an LED glows using little power. (a) False (b) True
10. 10.🧩 A capacitor in a circuit can … (a) store charge briefly (b) measure heat (c) spin a wheel (d) make light
11. 11.🧩 Which part changes electrical energy into sound? (a) a capacitor (b) a diode (c) a resistor (d) a buzzer
12. 12.🧩 Which component lets current go one way? (a) diode (b) potentiometer (c) resistor (d) motor
13. 13.What does a potentiometer do? (a) senses how bright it is (b) stores a little charge (c) is a resistance knob (d) blows if current is high
14. 14.What does a capacitor do? (a) glows using little power (b) senses how hot it is (c) limits the current (d) stores a little charge
15. 15.What does a transistor do? (a) lets current go one way (b) has coloured bands (c) senses how hot it is (d) boosts a small signal
16. 16.True or false: a capacitor senses how bright it is. (a) True (b) False
17. 17.🧩 Which component senses how bright it is? (a) resistor (b) LDR (c) motor (d) potentiometer
18. 18.True or false: a thermistor stores a little charge. (a) False (b) True
19. 19.What does a capacitor do? (a) smooths a wobbly supply (b) senses how bright it is (c) glows using little power (d) blows if current is high
20. 20.🧩 Which part changes electrical energy into movement? (a) a fuse (b) a resistor (c) an LED (d) a motor
21. 21.What does a diode do? (a) lets current go one way (b) stores a little charge (c) makes a beeping sound (d) smooths a wobbly supply
22. 22.🧩 Which component boosts a small signal? (a) LED (b) motor (c) buzzer (d) transistor
23. 23.True or false: a motor turns a fan or wheels. (a) False (b) True
24. 24.🧩 Which component makes a beeping sound? (a) diode (b) buzzer (c) LED (d) transistor
25. 25.What does a buzzer do? (a) limits the current (b) turns a fan or wheels (c) makes things spin (d) makes a beeping sound
26. 26.True or false: an LDR stores a little charge. (a) True (b) False
27. 27.True or false: a buzzer blows if current is high. (a) True (b) False
28. 28.🧩 Which component beeps for an alarm? (a) transistor (b) buzzer (c) potentiometer (d) thermistor
29. 29.True or false: a resistor beeps for an alarm. (a) False (b) True
30. 30.🧩 Which component stores a little charge? (a) diode (b) potentiometer (c) LED (d) capacitor
31. 31.What does a resistor do? (a) blows if current is high (b) has coloured bands (c) senses how bright it is (d) stores a little charge
32. 32.🧩 Which component senses how hot it is? (a) thermistor (b) transistor (c) fuse (d) LED
33. 33.True or false: a potentiometer is a resistance knob. (a) True (b) False
34. 34.True or false: a fuse senses how bright it is. (a) False (b) True
35. 35.True or false: a thermistor blows if current is high. (a) False (b) True
36. 36.True or false: a buzzer senses how bright it is. (a) True (b) False
37. 37.What does a fuse do? (a) blows if current is high (b) senses how hot it is (c) senses how bright it is (d) smooths a wobbly supply
38. 38.True or false: a buzzer makes a beeping sound. (a) True (b) False
39. 39.🧩 A capacitor in a circuit can … (a) make light (b) measure heat (c) spin a wheel (d) store charge briefly
40. 40.True or false: a transistor has coloured bands. (a) True (b) False

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