Electronics Worksheet: Sensors and Actuators

Electronics lesson 26: Sensors and actuators · Set 304 · 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 job needs a motor? (a) spin a robot’s wheels (b) show the temperature (c) show a status light (d) move water to plants
2. 2.🔍 For a microcontroller, is a sensor an input or an output? (a) a fuse (b) a power source (c) an input (d) an output
3. 3.⚙️ Which actuator would you use to turn to an exact angle? (a) a pump (b) a servo motor (c) a motor (d) a buzzer
4. 4.True or false: to stop a robot near walls, use a distance sensor. (a) True (b) False
5. 5.⚙️ What is an actuator? (a) a battery (b) an output that acts (c) a program (d) a sensor
6. 6.🔍 Which sensor would you use to keep an incubator warm? (a) a gas sensor (b) a temperature sensor (c) a soil moisture sensor (d) a distance sensor
7. 7.Which job needs a gas sensor? (a) switch on lamps at dusk (b) switch on with a clap (c) start a fan when hot (d) warn of a gas leak
8. 8.🔍 Which sensor would you use to switch on lamps at dusk? (a) a motion sensor (b) a distance sensor (c) a light sensor (d) a temperature sensor
9. 9.⚙️ Which actuator would you use to open a gate to 90°? (a) a servo motor (b) an LED (c) a display (d) a pump
10. 10.⚙️ Which actuator would you use to spin a robot’s wheels? (a) a pump (b) a motor (c) a servo motor (d) an LED
11. 11.Which job needs a display? (a) show the temperature (b) turn to an exact angle (c) move water to plants (d) spin a robot’s wheels
12. 12.True or false: to keep an incubator warm, use a soil moisture sensor. (a) True (b) False
13. 13.🔍 A distance sensor sends a sound pulse and hears the echo 2 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
14. 14.⚙️ Which actuator would you use to show the temperature? (a) a pump (b) a display (c) a motor (d) an LED
15. 15.🔍 Which sensor would you use to make a parking alarm? (a) a distance sensor (b) a motion sensor (c) a soil moisture sensor (d) a sound sensor
16. 16.🔍 A distance sensor sends a sound pulse and hears the echo 10 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
17. 17.🔍 Which sensor would you use to close a window in rain? (a) a light sensor (b) a motion sensor (c) a sound sensor (d) a rain sensor
18. 18.Which job needs a pump? (a) show a status light (b) show the temperature (c) move water to plants (d) turn to an exact angle
19. 19.Which job needs a buzzer? (a) move water to plants (b) spin a robot’s wheels (c) beep an alarm (d) show a status light
20. 20.True or false: to stop a robot near walls, use a gas sensor. (a) False (b) True
21. 21.Which job needs a servo motor? (a) show a status light (b) beep an alarm (c) spin a robot’s wheels (d) turn to an exact angle
22. 22.🔍 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)?
23. 23.🔍 A distance sensor sends a sound pulse and hears the echo 12 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
24. 24.🔍 Which sensor would you use to start a fan when hot? (a) a soil moisture sensor (b) a distance sensor (c) a temperature sensor (d) a gas sensor
25. 25.Which job needs a rain sensor? (a) measure classroom noise (b) close a window in rain (c) open blinds at sunrise (d) start a fan when hot
26. 26.🔍 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)?
27. 27.Which job needs a servo motor? (a) beep an alarm (b) show the temperature (c) open a gate to 90° (d) show a status light
28. 28.Which job needs a motion sensor? (a) spot someone walking in (b) switch on lamps at dusk (c) water a dry plant (d) switch on with a clap
29. 29.⚙️ Which actuator would you use to move water to plants? (a) a motor (b) a servo motor (c) a display (d) a pump
30. 30.Which job needs a temperature sensor? (a) water a dry plant (b) keep an incubator warm (c) open blinds at sunrise (d) switch on lamps at dusk
31. 31.🔍 Which sensor would you use to stop a robot near walls? (a) a distance sensor (b) a temperature sensor (c) a motion sensor (d) a light sensor
32. 32.🔍 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?
33. 33.🔍 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)?
34. 34.🔍 An object is 255 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 light sensor? (a) make a parking alarm (b) switch on lamps at dusk (c) start a fan when hot (d) spot someone walking in
36. 36.⚙️ Which actuator would you use to show a status light? (a) a motor (b) an LED (c) a servo motor (d) a buzzer
37. 37.True or false: to make a parking alarm, use a distance sensor. (a) True (b) False
38. 38.🔍 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?
39. 39.Which job needs a distance sensor? (a) close a window in rain (b) keep an incubator warm (c) start a fan when hot (d) stop a robot near walls
40. 40.🔍 An object is 102 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?

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