Electronics Worksheet: Sensors and Actuators

Electronics lesson 26: Sensors and actuators · Set 124 · 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 switch on lamps at dusk? (a) a sound sensor (b) a light sensor (c) a soil moisture sensor (d) a rain sensor
2. 2.🔍 Which sensor would you use to keep an incubator warm? (a) a temperature sensor (b) a rain sensor (c) a motion sensor (d) a gas sensor
3. 3.🔍 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?
4. 4.Which job needs a motion sensor? (a) spot someone walking in (b) warn of a gas leak (c) switch on lamps at dusk (d) start a fan when hot
5. 5.🔍 Which sensor would you use to switch on with a clap? (a) a gas sensor (b) a light sensor (c) a sound sensor (d) a distance sensor
6. 6.🔍 Which sensor would you use to water a dry plant? (a) a distance sensor (b) a soil moisture sensor (c) a temperature sensor (d) a sound sensor
7. 7.True or false: to start a fan when hot, use a temperature sensor. (a) True (b) False
8. 8.⚙️ Which actuator would you use to open a gate to 90°? (a) a display (b) an LED (c) a servo motor (d) a motor
9. 9.⚙️ Which actuator would you use to show a status light? (a) a motor (b) a display (c) a pump (d) an LED
10. 10.Which job needs a gas sensor? (a) warn of a gas leak (b) switch on with a clap (c) close a window in rain (d) spot someone walking in
11. 11.Which job needs a rain sensor? (a) keep an incubator warm (b) make a parking alarm (c) stop a robot near walls (d) close a window in rain
12. 12.⚙️ Which actuator would you use to beep an alarm? (a) a pump (b) a display (c) a buzzer (d) an LED
13. 13.Which job needs a soil moisture sensor? (a) switch on lamps at dusk (b) keep an incubator warm (c) close a window in rain (d) water a dry plant
14. 14.Which job needs a motor? (a) spin a robot’s wheels (b) show a status light (c) beep an alarm (d) turn to an exact angle
15. 15.🔍 An object is 85 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
16. 16.True or false: to open blinds at sunrise, use a sound sensor. (a) True (b) False
17. 17.🔍 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)?
18. 18.Which job needs an LED? (a) show the temperature (b) show a status light (c) move water to plants (d) open a gate to 90°
19. 19.🔍 Which sensor would you use to warn of a gas leak? (a) a soil moisture sensor (b) a gas sensor (c) a light sensor (d) a temperature sensor
20. 20.Which job needs a servo motor? (a) beep an alarm (b) open a gate to 90° (c) move water to plants (d) show the temperature
21. 21.True or false: to close a window in rain, use a temperature sensor. (a) True (b) False
22. 22.🔍 For a microcontroller, is a sensor an input or an output? (a) a fuse (b) a power source (c) an output (d) an input
23. 23.Which job needs a temperature sensor? (a) make a parking alarm (b) stop a robot near walls (c) switch on lamps at dusk (d) start a fan when hot
24. 24.⚙️ What is an actuator? (a) an output that acts (b) a battery (c) a program (d) a sensor
25. 25.🔍 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?
26. 26.⚙️ Which actuator would you use to turn to an exact angle? (a) a pump (b) a motor (c) a servo motor (d) a buzzer
27. 27.🔍 Which sensor would you use to stop a robot near walls? (a) a light sensor (b) a distance sensor (c) a sound sensor (d) a soil moisture sensor
28. 28.True or false: to stop a robot near walls, use a distance sensor. (a) False (b) True
29. 29.🔍 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?
30. 30.Which job needs a sound sensor? (a) switch on lamps at dusk (b) stop a robot near walls (c) close a window in rain (d) switch on with a clap
31. 31.🔍 An object is 136 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
32. 32.🔍 A distance sensor sends a sound pulse and hears the echo 20 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
33. 33.True or false: to open blinds at sunrise, use a light sensor. (a) True (b) False
34. 34.🔍 Which sensor would you use to close a window in rain? (a) a light sensor (b) a soil moisture sensor (c) a rain sensor (d) a motion sensor
35. 35.Which job needs a display? (a) turn to an exact angle (b) open a gate to 90° (c) show the temperature (d) beep an alarm
36. 36.⚙️ Which actuator would you use to spin a robot’s wheels? (a) an LED (b) a buzzer (c) a motor (d) a servo motor
37. 37.True or false: to close a window in rain, use a motion sensor. (a) True (b) False
38. 38.🔍 A distance sensor sends a sound pulse and hears the echo 11 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
39. 39.Which job needs a servo motor? (a) turn to an exact angle (b) beep an alarm (c) move water to plants (d) spin a robot’s wheels
40. 40.🔍 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?

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