Electronics Worksheet: Sensors and Actuators

Electronics lesson 26: Sensors and actuators · Set 87 · 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 keep an incubator warm? (a) a light sensor (b) a temperature sensor (c) a gas sensor (d) a distance sensor
2. 2.True or false: to switch on lamps at dusk, use a light sensor. (a) True (b) False
3. 3.Which job needs a buzzer? (a) show the temperature (b) beep an alarm (c) show a status light (d) open a gate to 90°
4. 4.🔍 For a microcontroller, is a sensor an input or an output? (a) an input (b) a power source (c) a fuse (d) an output
5. 5.⚙️ What is an actuator? (a) a sensor (b) a program (c) a battery (d) an output that acts
6. 6.🔍 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?
7. 7.True or false: to measure classroom noise, use a rain sensor. (a) True (b) False
8. 8.True or false: to stop a robot near walls, use a gas sensor. (a) False (b) True
9. 9.Which job needs a rain sensor? (a) open blinds at sunrise (b) water a dry plant (c) switch on lamps at dusk (d) close a window in rain
10. 10.True or false: to measure classroom noise, use a sound sensor. (a) True (b) False
11. 11.Which job needs a distance sensor? (a) keep an incubator warm (b) warn of a gas leak (c) close a window in rain (d) stop a robot near walls
12. 12.True or false: to stop a robot near walls, use a distance sensor. (a) True (b) False
13. 13.🔍 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?
14. 14.🔍 Which sensor would you use to make a parking alarm? (a) a distance sensor (b) a gas sensor (c) a soil moisture sensor (d) a motion sensor
15. 15.Which job needs a motor? (a) move water to plants (b) spin a robot’s wheels (c) show the temperature (d) open a gate to 90°
16. 16.⚙️ Which actuator would you use to show the temperature? (a) a display (b) a buzzer (c) a pump (d) an LED
17. 17.🔍 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)?
18. 18.⚙️ Which actuator would you use to turn to an exact angle? (a) a servo motor (b) a motor (c) a buzzer (d) an LED
19. 19.Which job needs a servo motor? (a) show the temperature (b) move water to plants (c) turn to an exact angle (d) beep an alarm
20. 20.Which job needs a pump? (a) spin a robot’s wheels (b) turn to an exact angle (c) open a gate to 90° (d) move water to plants
21. 21.Which job needs a motion sensor? (a) spot someone walking in (b) water a dry plant (c) start a fan when hot (d) close a window in rain
22. 22.Which job needs a soil moisture sensor? (a) water a dry plant (b) stop a robot near walls (c) make a parking alarm (d) spot someone walking in
23. 23.Which job needs a display? (a) show a status light (b) open a gate to 90° (c) show the temperature (d) move water to plants
24. 24.True or false: to spot someone walking in, use a soil moisture sensor. (a) False (b) True
25. 25.🔍 Which sensor would you use to start a fan when hot? (a) a temperature sensor (b) a distance sensor (c) a light sensor (d) a gas sensor
26. 26.🔍 Which sensor would you use to switch on with a clap? (a) a motion sensor (b) a temperature sensor (c) a sound sensor (d) a light sensor
27. 27.🔍 Which sensor would you use to close a window in rain? (a) a distance sensor (b) a soil moisture sensor (c) a rain sensor (d) a light sensor
28. 28.True or false: to start a fan when hot, use a distance sensor. (a) False (b) True
29. 29.🔍 A distance sensor sends a sound pulse and hears the echo 13 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
30. 30.🔍 Which sensor would you use to spot someone walking in? (a) a soil moisture sensor (b) a temperature sensor (c) a motion sensor (d) a light sensor
31. 31.Which job needs a servo motor? (a) beep an alarm (b) move water to plants (c) open a gate to 90° (d) show a status light
32. 32.True or false: to measure classroom noise, use a gas sensor. (a) False (b) True
33. 33.🔍 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)?
34. 34.True or false: to warn of a gas leak, use a gas sensor. (a) False (b) True
35. 35.Which job needs an LED? (a) show a status light (b) spin a robot’s wheels (c) move water to plants (d) open a gate to 90°
36. 36.🔍 Which sensor would you use to switch on lamps at dusk? (a) a gas sensor (b) a light sensor (c) a temperature sensor (d) a sound sensor
37. 37.🔍 Which sensor would you use to measure classroom noise? (a) a sound sensor (b) a motion sensor (c) a temperature sensor (d) a gas sensor
38. 38.True or false: to spot someone walking in, use a motion sensor. (a) False (b) True
39. 39.True or false: to water a dry plant, use a temperature sensor. (a) False (b) True
40. 40.🔍 Which sensor would you use to open blinds at sunrise? (a) a motion sensor (b) a gas sensor (c) a sound sensor (d) a light sensor

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