Electronics Worksheet: Sensors and Actuators

Electronics lesson 26: Sensors and actuators · Set 115 · 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.True or false: to close a window in rain, use a rain sensor. (a) True (b) False
2. 2.🔍 An object is 17 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
3. 3.⚙️ Which actuator would you use to turn to an exact angle? (a) a buzzer (b) a servo motor (c) a motor (d) a display
4. 4.Which job needs a light sensor? (a) close a window in rain (b) water a dry plant (c) open blinds at sunrise (d) measure classroom noise
5. 5.🔍 A distance sensor sends a sound pulse and hears the echo 7 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
6. 6.🔍 An object is 68 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
7. 7.True or false: to switch on with a clap, use a sound sensor. (a) False (b) True
8. 8.Which job needs a rain sensor? (a) stop a robot near walls (b) switch on lamps at dusk (c) warn of a gas leak (d) close a window in rain
9. 9.⚙️ Which actuator would you use to spin a robot’s wheels? (a) an LED (b) a pump (c) a buzzer (d) a motor
10. 10.True or false: to measure classroom noise, use a sound sensor. (a) False (b) True
11. 11.⚙️ Which actuator would you use to beep an alarm? (a) a display (b) a servo motor (c) a motor (d) a buzzer
12. 12.Which job needs a motion sensor? (a) switch on lamps at dusk (b) make a parking alarm (c) spot someone walking in (d) open blinds at sunrise
13. 13.Which job needs a temperature sensor? (a) spot someone walking in (b) switch on lamps at dusk (c) keep an incubator warm (d) open blinds at sunrise
14. 14.🔍 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?
15. 15.Which job needs a display? (a) beep an alarm (b) show a status light (c) show the temperature (d) open a gate to 90°
16. 16.True or false: to stop a robot near walls, use a motion sensor. (a) False (b) True
17. 17.🔍 A distance sensor sends a sound pulse and hears the echo 6 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
18. 18.🔍 Which sensor would you use to keep an incubator warm? (a) a sound sensor (b) a light sensor (c) a gas sensor (d) a temperature sensor
19. 19.True or false: to open blinds at sunrise, use a motion sensor. (a) False (b) True
20. 20.⚙️ Which actuator would you use to show the temperature? (a) an LED (b) a motor (c) a servo motor (d) a display
21. 21.True or false: to close a window in rain, use a gas sensor. (a) False (b) True
22. 22.True or false: to keep an incubator warm, use a temperature sensor. (a) False (b) True
23. 23.Which job needs a light sensor? (a) spot someone walking in (b) close a window in rain (c) switch on lamps at dusk (d) switch on with a clap
24. 24.🔍 An object is 306 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
25. 25.🔍 A distance sensor sends a sound pulse and hears the echo 19 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
26. 26.True or false: to spot someone walking in, use a sound sensor. (a) True (b) False
27. 27.True or false: to stop a robot near walls, use a distance sensor. (a) False (b) True
28. 28.⚙️ What is an actuator? (a) a program (b) a battery (c) an output that acts (d) a sensor
29. 29.🔍 For a microcontroller, is a sensor an input or an output? (a) an input (b) a fuse (c) an output (d) a power source
30. 30.🔍 A distance sensor sends a sound pulse and hears the echo 11 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
31. 31.Which job needs a pump? (a) spin a robot’s wheels (b) open a gate to 90° (c) move water to plants (d) show a status light
32. 32.True or false: to stop a robot near walls, use a gas sensor. (a) True (b) False
33. 33.🔍 A distance sensor sends a sound pulse and hears the echo 1 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
34. 34.🔍 An object is 238 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
35. 35.Which job needs a temperature sensor? (a) water a dry plant (b) switch on lamps at dusk (c) start a fan when hot (d) stop a robot near walls
36. 36.🔍 An object is 51 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
37. 37.🔍 A distance sensor sends a sound pulse and hears the echo 18 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
38. 38.🔍 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?
39. 39.Which job needs a distance sensor? (a) stop a robot near walls (b) spot someone walking in (c) close a window in rain (d) open blinds at sunrise
40. 40.Which job needs a gas sensor? (a) make a parking alarm (b) switch on lamps at dusk (c) measure classroom noise (d) warn of a gas leak

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