Electronics Worksheet: Sensors and Actuators

Electronics lesson 26: Sensors and actuators · Set 63 · 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.🔍 Which sensor would you use to start a fan when hot? (a) a temperature sensor (b) a gas sensor (c) a rain sensor (d) a distance sensor
2. 2.⚙️ Which actuator would you use to turn to an exact angle? (a) a buzzer (b) a display (c) a servo motor (d) a pump
3. 3.Which job needs a buzzer? (a) beep an alarm (b) turn to an exact angle (c) open a gate to 90° (d) move water to plants
4. 4.⚙️ Which actuator would you use to beep an alarm? (a) an LED (b) a buzzer (c) a display (d) a pump
5. 5.True or false: to measure classroom noise, use a distance sensor. (a) True (b) False
6. 6.Which job needs a rain sensor? (a) make a parking alarm (b) close a window in rain (c) water a dry plant (d) open blinds at sunrise
7. 7.⚙️ What is an actuator? (a) an output that acts (b) a battery (c) a program (d) a sensor
8. 8.⚙️ Which actuator would you use to open a gate to 90°? (a) a display (b) a servo motor (c) an LED (d) a motor
9. 9.True or false: to water a dry plant, use a soil moisture sensor. (a) False (b) True
10. 10.Which job needs a display? (a) show the temperature (b) move water to plants (c) show a status light (d) turn to an exact angle
11. 11.🔍 Which sensor would you use to switch on with a clap? (a) a sound sensor (b) a soil moisture sensor (c) a gas sensor (d) a temperature sensor
12. 12.True or false: to close a window in rain, use a rain sensor. (a) False (b) True
13. 13.True or false: to warn of a gas leak, use a distance sensor. (a) True (b) False
14. 14.🔍 A distance sensor sends a sound pulse and hears the echo 4 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
15. 15.🔍 For a microcontroller, is a sensor an input or an output? (a) a power source (b) an input (c) a fuse (d) an output
16. 16.True or false: to warn of a gas leak, use a temperature sensor. (a) True (b) False
17. 17.True or false: to keep an incubator warm, use a sound sensor. (a) False (b) True
18. 18.🔍 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)?
19. 19.🔍 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?
20. 20.🔍 An object is 204 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
21. 21.⚙️ Which actuator would you use to show a status light? (a) an LED (b) a servo motor (c) a motor (d) a pump
22. 22.🔍 Which sensor would you use to open blinds at sunrise? (a) a temperature sensor (b) a light sensor (c) a motion sensor (d) a distance sensor
23. 23.True or false: to make a parking alarm, use a distance sensor. (a) True (b) False
24. 24.Which job needs a motion sensor? (a) switch on lamps at dusk (b) spot someone walking in (c) warn of a gas leak (d) stop a robot near walls
25. 25.True or false: to keep an incubator warm, use a motion sensor. (a) False (b) True
26. 26.Which job needs a servo motor? (a) move water to plants (b) spin a robot’s wheels (c) turn to an exact angle (d) show a status light
27. 27.Which job needs a gas sensor? (a) close a window in rain (b) warn of a gas leak (c) stop a robot near walls (d) open blinds at sunrise
28. 28.🔍 A distance sensor sends a sound pulse and hears the echo 9 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
29. 29.🔍 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?
30. 30.🔍 An object is 170 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
31. 31.🔍 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)?
32. 32.Which job needs a pump? (a) spin a robot’s wheels (b) beep an alarm (c) show the temperature (d) move water to plants
33. 33.True or false: to stop a robot near walls, use a temperature sensor. (a) False (b) True
34. 34.🔍 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?
35. 35.🔍 Which sensor would you use to stop a robot near walls? (a) a sound sensor (b) a gas sensor (c) a distance sensor (d) a rain sensor
36. 36.True or false: to warn of a gas leak, use a sound sensor. (a) False (b) True
37. 37.🔍 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)?
38. 38.⚙️ Which actuator would you use to show the temperature? (a) a servo motor (b) a buzzer (c) a motor (d) a display
39. 39.🔍 Which sensor would you use to make a parking alarm? (a) a temperature sensor (b) a distance sensor (c) a soil moisture sensor (d) a motion sensor
40. 40.Which job needs a soil moisture sensor? (a) water a dry plant (b) make a parking alarm (c) open blinds at sunrise (d) start a fan when hot

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