Electronics Worksheet: Sensors and Actuators

Electronics lesson 26: Sensors and actuators · Set 318 · 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.True or false: to stop a robot near walls, use a distance sensor. (a) True (b) False
2. 2.🔍 Which sensor would you use to open blinds at sunrise? (a) a temperature sensor (b) a motion sensor (c) a distance sensor (d) a light sensor
3. 3.🔍 Which sensor would you use to start a fan when hot? (a) a light sensor (b) a distance sensor (c) a sound sensor (d) a temperature sensor
4. 4.🔍 For a microcontroller, is a sensor an input or an output? (a) an output (b) an input (c) a fuse (d) a power source
5. 5.⚙️ What is an actuator? (a) a battery (b) a sensor (c) an output that acts (d) a program
6. 6.⚙️ Which actuator would you use to move water to plants? (a) a motor (b) a pump (c) an LED (d) a display
7. 7.Which job needs a pump? (a) show the temperature (b) turn to an exact angle (c) move water to plants (d) show a status light
8. 8.🔍 Which sensor would you use to stop a robot near walls? (a) a distance sensor (b) a temperature sensor (c) a rain sensor (d) a gas sensor
9. 9.Which job needs a soil moisture sensor? (a) measure classroom noise (b) make a parking alarm (c) close a window in rain (d) water a dry plant
10. 10.🔍 Which sensor would you use to switch on lamps at dusk? (a) a soil moisture sensor (b) a motion sensor (c) a light sensor (d) a distance sensor
11. 11.⚙️ Which actuator would you use to show a status light? (a) a buzzer (b) a servo motor (c) an LED (d) a pump
12. 12.Which job needs a light sensor? (a) make a parking alarm (b) close a window in rain (c) measure classroom noise (d) switch on lamps at dusk
13. 13.🔍 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?
14. 14.True or false: to open blinds at sunrise, use a gas sensor. (a) True (b) False
15. 15.Which job needs a motor? (a) show a status light (b) beep an alarm (c) show the temperature (d) spin a robot’s wheels
16. 16.True or false: to switch on with a clap, use a sound sensor. (a) True (b) False
17. 17.🔍 Which sensor would you use to warn of a gas leak? (a) a distance sensor (b) a gas sensor (c) a temperature sensor (d) a motion sensor
18. 18.Which job needs a display? (a) show the temperature (b) spin a robot’s wheels (c) beep an alarm (d) show a status light
19. 19.True or false: to keep an incubator warm, use a soil moisture sensor. (a) True (b) False
20. 20.🔍 Which sensor would you use to water a dry plant? (a) a light sensor (b) a sound sensor (c) a soil moisture sensor (d) a distance sensor
21. 21.True or false: to stop a robot near walls, use a temperature sensor. (a) True (b) False
22. 22.⚙️ Which actuator would you use to beep an alarm? (a) a buzzer (b) an LED (c) a motor (d) a display
23. 23.True or false: to close a window in rain, use a rain sensor. (a) True (b) False
24. 24.True or false: to switch on lamps at dusk, use a motion sensor. (a) True (b) False
25. 25.🔍 Which sensor would you use to keep an incubator warm? (a) a soil moisture sensor (b) a distance sensor (c) a light sensor (d) a temperature sensor
26. 26.🔍 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)?
27. 27.True or false: to water a dry plant, use a soil moisture sensor. (a) True (b) False
28. 28.Which job needs a temperature sensor? (a) water a dry plant (b) keep an incubator warm (c) switch on with a clap (d) warn of a gas leak
29. 29.Which job needs a light sensor? (a) water a dry plant (b) measure classroom noise (c) open blinds at sunrise (d) spot someone walking in
30. 30.⚙️ Which actuator would you use to turn to an exact angle? (a) a pump (b) an LED (c) a servo motor (d) a buzzer
31. 31.🔍 A distance sensor sends a sound pulse and hears the echo 8 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
32. 32.⚙️ Which actuator would you use to open a gate to 90°? (a) a buzzer (b) a pump (c) a display (d) a servo motor
33. 33.Which job needs a buzzer? (a) spin a robot’s wheels (b) show a status light (c) beep an alarm (d) open a gate to 90°
34. 34.Which job needs a gas sensor? (a) make a parking alarm (b) stop a robot near walls (c) switch on with a clap (d) warn of a gas leak
35. 35.True or false: to water a dry plant, use a light sensor. (a) True (b) False
36. 36.🔍 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?
37. 37.🔍 A distance sensor sends a sound pulse and hears the echo 1 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
38. 38.🔍 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)?
39. 39.🔍 Which sensor would you use to make a parking alarm? (a) a sound sensor (b) a gas sensor (c) a distance sensor (d) a motion sensor
40. 40.🔍 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)?

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