Electronics Worksheet: Sensors and Actuators

Electronics lesson 26: Sensors and actuators · Set 3 · 40 questions

Remember (Measure it, then move it): Match the sensor to the quantity: light, heat, distance, movement, soil wetness, sound, gas or rain. Match the actuator to the action: spin (motor), exact angle (servo), beep (buzzer), light (LED), water (pump), numbers (display). Echo distance = 17 × echo time in ms (cm), because the sound goes there and back.

1. 1.⚙️ What is an actuator? (a) a battery (b) an output that acts (c) a sensor (d) a program
2. 2.⚙️ Which actuator would you use to move water to plants? (a) an LED (b) a pump (c) a motor (d) a buzzer
3. 3.Which job needs a temperature sensor? (a) stop a robot near walls (b) open blinds at sunrise (c) switch on with a clap (d) start a fan when hot
4. 4.🔍 Which sensor would you use to open blinds at sunrise? (a) a light sensor (b) a gas sensor (c) a motion sensor (d) a soil moisture sensor
5. 5.🔍 A distance sensor sends a sound pulse and hears the echo 15 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
6. 6.Which job needs a light sensor? (a) switch on with a clap (b) stop a robot near walls (c) make a parking alarm (d) switch on lamps at dusk
7. 7.True or false: to stop a robot near walls, use a rain sensor. (a) False (b) True
8. 8.True or false: to measure classroom noise, use a sound sensor. (a) True (b) False
9. 9.Which job needs a motion sensor? (a) switch on lamps at dusk (b) measure classroom noise (c) water a dry plant (d) spot someone walking in
10. 10.Which job needs a light sensor? (a) switch on with a clap (b) measure classroom noise (c) keep an incubator warm (d) open blinds at sunrise
11. 11.🔍 For a microcontroller, is a sensor an input or an output? (a) a power source (b) an output (c) an input (d) a fuse
12. 12.🔍 Which sensor would you use to water a dry plant? (a) a light sensor (b) a temperature sensor (c) a soil moisture sensor (d) a gas sensor
13. 13.🔍 Which sensor would you use to measure classroom noise? (a) a distance sensor (b) a gas sensor (c) a sound sensor (d) a temperature sensor
14. 14.Which job needs a soil moisture sensor? (a) switch on lamps at dusk (b) measure classroom noise (c) water a dry plant (d) open blinds at sunrise
15. 15.⚙️ Which actuator would you use to open a gate to 90°? (a) a display (b) a motor (c) a servo motor (d) a buzzer
16. 16.Which job needs a sound sensor? (a) make a parking alarm (b) warn of a gas leak (c) keep an incubator warm (d) switch on with a clap
17. 17.Which job needs a motor? (a) open a gate to 90° (b) turn to an exact angle (c) show the temperature (d) spin a robot’s wheels
18. 18.🔍 A distance sensor sends a sound pulse and hears the echo 14 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
19. 19.🔍 An object is 323 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
20. 20.🔍 Which sensor would you use to warn of a gas leak? (a) a distance sensor (b) a gas sensor (c) a soil moisture sensor (d) a temperature sensor
21. 21.Which job needs a pump? (a) show a status light (b) move water to plants (c) open a gate to 90° (d) show the temperature
22. 22.🔍 Which sensor would you use to close a window in rain? (a) a gas sensor (b) a light sensor (c) a sound sensor (d) a rain sensor
23. 23.Which job needs a display? (a) spin a robot’s wheels (b) show the temperature (c) turn to an exact angle (d) show a status light
24. 24.True or false: to start a fan when hot, use a light sensor. (a) True (b) False
25. 25.🔍 A distance sensor sends a sound pulse and hears the echo 8 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
26. 26.⚙️ Which actuator would you use to spin a robot’s wheels? (a) a motor (b) an LED (c) a display (d) a servo motor
27. 27.🔍 An object is 34 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
28. 28.True or false: to keep an incubator warm, use a light sensor. (a) True (b) False
29. 29.Which job needs a buzzer? (a) show the temperature (b) beep an alarm (c) turn to an exact angle (d) move water to plants
30. 30.🔍 Which sensor would you use to spot someone walking in? (a) a motion sensor (b) a soil moisture sensor (c) a temperature sensor (d) a distance sensor
31. 31.True or false: to stop a robot near walls, use a distance sensor. (a) False (b) True
32. 32.True or false: to warn of a gas leak, use a rain sensor. (a) True (b) False
33. 33.🔍 Which sensor would you use to make a parking alarm? (a) a light sensor (b) a distance sensor (c) a temperature sensor (d) a sound sensor
34. 34.Which job needs a rain sensor? (a) open blinds at sunrise (b) measure classroom noise (c) close a window in rain (d) warn of a gas leak
35. 35.Which job needs a distance sensor? (a) water a dry plant (b) close a window in rain (c) stop a robot near walls (d) spot someone walking in
36. 36.🔍 Which sensor would you use to switch on with a clap? (a) a light sensor (b) a rain sensor (c) a gas sensor (d) a sound sensor
37. 37.⚙️ Which actuator would you use to beep an alarm? (a) a pump (b) a motor (c) a servo motor (d) a buzzer
38. 38.⚙️ Which actuator would you use to show the temperature? (a) a servo motor (b) a display (c) a buzzer (d) an LED
39. 39.True or false: to switch on with a clap, use a distance sensor. (a) False (b) True
40. 40.🔍 A distance sensor sends a sound pulse and hears the echo 3 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?

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