Electronics Worksheet: Sensors and Actuators

Electronics lesson 26: Sensors and actuators · Set 247 · 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 an LED? (a) turn to an exact angle (b) open a gate to 90° (c) spin a robot’s wheels (d) show a status light
2. 2.🔍 Which sensor would you use to stop a robot near walls? (a) a temperature sensor (b) a motion sensor (c) a distance sensor (d) a sound sensor
3. 3.🔍 For a microcontroller, is a sensor an input or an output? (a) a fuse (b) an output (c) a power source (d) an input
4. 4.🔍 Which sensor would you use to switch on with a clap? (a) a light sensor (b) a distance sensor (c) a rain sensor (d) a sound sensor
5. 5.🔍 Which sensor would you use to open blinds at sunrise? (a) a light sensor (b) a temperature sensor (c) a distance sensor (d) a soil moisture sensor
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.Which job needs a servo motor? (a) turn to an exact angle (b) beep an alarm (c) show the temperature (d) spin a robot’s wheels
8. 8.True or false: to switch on lamps at dusk, use a sound sensor. (a) True (b) False
9. 9.Which job needs a rain sensor? (a) close a window in rain (b) switch on lamps at dusk (c) spot someone walking in (d) stop a robot near walls
10. 10.⚙️ Which actuator would you use to show the temperature? (a) a display (b) a pump (c) a motor (d) an LED
11. 11.True or false: to stop a robot near walls, use a light sensor. (a) False (b) True
12. 12.Which job needs a motor? (a) turn to an exact angle (b) spin a robot’s wheels (c) open a gate to 90° (d) beep an alarm
13. 13.Which job needs a soil moisture sensor? (a) water a dry plant (b) open blinds at sunrise (c) start a fan when hot (d) switch on with a clap
14. 14.🔍 Which sensor would you use to start a fan when hot? (a) a gas sensor (b) a rain sensor (c) a light sensor (d) a temperature sensor
15. 15.Which job needs a display? (a) open a gate to 90° (b) show the temperature (c) move water to plants (d) beep an alarm
16. 16.True or false: to start a fan when hot, use a temperature sensor. (a) True (b) False
17. 17.🔍 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?
18. 18.⚙️ Which actuator would you use to spin a robot’s wheels? (a) a motor (b) a pump (c) a servo motor (d) an LED
19. 19.🔍 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)?
20. 20.True or false: to start a fan when hot, use a sound sensor. (a) False (b) True
21. 21.🔍 An object is 289 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
22. 22.🔍 Which sensor would you use to switch on lamps at dusk? (a) a motion sensor (b) a distance sensor (c) a sound sensor (d) a light sensor
23. 23.Which job needs a pump? (a) show the temperature (b) spin a robot’s wheels (c) move water to plants (d) show a status light
24. 24.True or false: to open blinds at sunrise, use a motion sensor. (a) False (b) True
25. 25.True or false: to spot someone walking in, use a light sensor. (a) True (b) False
26. 26.Which job needs a distance sensor? (a) close a window in rain (b) switch on with a clap (c) start a fan when hot (d) make a parking alarm
27. 27.🔍 An object is 272 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
28. 28.True or false: to make a parking alarm, use a distance sensor. (a) False (b) True
29. 29.🔍 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)?
30. 30.⚙️ Which actuator would you use to move water to plants? (a) a buzzer (b) a servo motor (c) a pump (d) a motor
31. 31.Which job needs a light sensor? (a) stop a robot near walls (b) switch on lamps at dusk (c) close a window in rain (d) start a fan when hot
32. 32.Which job needs a motion sensor? (a) switch on lamps at dusk (b) close a window in rain (c) spot someone walking in (d) water a dry plant
33. 33.True or false: to measure classroom noise, use a sound sensor. (a) True (b) False
34. 34.🔍 An object is 153 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 keep an incubator warm? (a) a sound sensor (b) a distance sensor (c) a light sensor (d) a temperature sensor
36. 36.Which job needs a temperature sensor? (a) make a parking alarm (b) spot someone walking in (c) start a fan when hot (d) stop a robot near walls
37. 37.🔍 Which sensor would you use to make a parking alarm? (a) a motion sensor (b) a temperature sensor (c) a distance sensor (d) a light sensor
38. 38.True or false: to make a parking alarm, use a gas sensor. (a) True (b) False
39. 39.🔍 A distance sensor sends a sound pulse and hears the echo 5 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
40. 40.🔍 Which sensor would you use to close a window in rain? (a) a gas sensor (b) a rain sensor (c) a soil moisture sensor (d) a motion sensor

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