Electronics Worksheet: Sensors and Actuators

Electronics lesson 26: Sensors and actuators · Set 121 · 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 display? (a) beep an alarm (b) show the temperature (c) move water to plants (d) open a gate to 90°
2. 2.🔍 For a microcontroller, is a sensor an input or an output? (a) a fuse (b) an input (c) an output (d) a power source
3. 3.🔍 Which sensor would you use to close a window in rain? (a) a rain sensor (b) a distance sensor (c) a temperature sensor (d) a soil moisture sensor
4. 4.True or false: to switch on with a clap, use a soil moisture sensor. (a) True (b) False
5. 5.True or false: to open blinds at sunrise, use a light sensor. (a) True (b) False
6. 6.🔍 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?
7. 7.🔍 Which sensor would you use to spot someone walking in? (a) a gas sensor (b) a sound sensor (c) a motion sensor (d) a distance sensor
8. 8.🔍 Which sensor would you use to measure classroom noise? (a) a gas sensor (b) a rain sensor (c) a sound sensor (d) a soil moisture sensor
9. 9.Which job needs a light sensor? (a) make a parking alarm (b) water a dry plant (c) open blinds at sunrise (d) spot someone walking in
10. 10.🔍 An object is 221 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
11. 11.True or false: to close a window in rain, use a rain sensor. (a) True (b) False
12. 12.⚙️ Which actuator would you use to show a status light? (a) a servo motor (b) a motor (c) a pump (d) an LED
13. 13.🔍 An object is 119 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
14. 14.🔍 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?
15. 15.⚙️ Which actuator would you use to move water to plants? (a) a motor (b) an LED (c) a pump (d) a servo motor
16. 16.True or false: to switch on lamps at dusk, use a light sensor. (a) True (b) False
17. 17.True or false: to measure classroom noise, use a sound sensor. (a) True (b) False
18. 18.🔍 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)?
19. 19.⚙️ Which actuator would you use to turn to an exact angle? (a) a buzzer (b) a display (c) a servo motor (d) a pump
20. 20.⚙️ What is an actuator? (a) a program (b) a sensor (c) a battery (d) an output that acts
21. 21.Which job needs a light sensor? (a) spot someone walking in (b) keep an incubator warm (c) close a window in rain (d) switch on lamps at dusk
22. 22.True or false: to switch on with a clap, use a distance sensor. (a) True (b) False
23. 23.True or false: to keep an incubator warm, use a sound sensor. (a) True (b) False
24. 24.True or false: to switch on lamps at dusk, use a rain sensor. (a) False (b) True
25. 25.Which job needs a rain sensor? (a) water a dry plant (b) close a window in rain (c) start a fan when hot (d) warn of a gas leak
26. 26.🔍 Which sensor would you use to stop a robot near walls? (a) a motion sensor (b) a sound sensor (c) a distance sensor (d) a temperature sensor
27. 27.⚙️ Which actuator would you use to beep an alarm? (a) a motor (b) an LED (c) a servo motor (d) a buzzer
28. 28.Which job needs a sound sensor? (a) measure classroom noise (b) switch on lamps at dusk (c) make a parking alarm (d) start a fan when hot
29. 29.🔍 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)?
30. 30.⚙️ Which actuator would you use to spin a robot’s wheels? (a) a pump (b) a display (c) a servo motor (d) a motor
31. 31.Which job needs a gas sensor? (a) warn of a gas leak (b) spot someone walking in (c) keep an incubator warm (d) switch on lamps at dusk
32. 32.Which job needs a motion sensor? (a) water a dry plant (b) close a window in rain (c) spot someone walking in (d) start a fan when hot
33. 33.True or false: to water a dry plant, use a soil moisture sensor. (a) True (b) False
34. 34.🔍 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?
35. 35.Which job needs a buzzer? (a) open a gate to 90° (b) show the temperature (c) beep an alarm (d) move water to plants
36. 36.🔍 Which sensor would you use to keep an incubator warm? (a) a light sensor (b) a distance sensor (c) a gas sensor (d) a temperature sensor
37. 37.🔍 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?
38. 38.🔍 Which sensor would you use to make a parking alarm? (a) a distance sensor (b) a temperature sensor (c) a motion sensor (d) a soil moisture sensor
39. 39.True or false: to spot someone walking in, use a soil moisture sensor. (a) False (b) True
40. 40.🔍 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)?

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