Electronics Worksheet: Sensors and Actuators

Electronics lesson 26: Sensors and actuators · Set 242 · 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 light sensor? (a) switch on lamps at dusk (b) water a dry plant (c) warn of a gas leak (d) spot someone walking in
2. 2.🔍 Which sensor would you use to keep an incubator warm? (a) a temperature sensor (b) a gas sensor (c) a light sensor (d) a rain sensor
3. 3.⚙️ Which actuator would you use to open a gate to 90°? (a) a pump (b) a servo motor (c) an LED (d) a buzzer
4. 4.⚙️ Which actuator would you use to show the temperature? (a) a display (b) a servo motor (c) a pump (d) a buzzer
5. 5.🔍 An object is 323 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
6. 6.⚙️ Which actuator would you use to spin a robot’s wheels? (a) a motor (b) a pump (c) a buzzer (d) an LED
7. 7.🔍 A distance sensor sends a sound pulse and hears the echo 6 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
8. 8.True or false: to switch on with a clap, use a sound sensor. (a) False (b) True
9. 9.True or false: to keep an incubator warm, use a soil moisture sensor. (a) True (b) False
10. 10.Which job needs a motion sensor? (a) open blinds at sunrise (b) measure classroom noise (c) spot someone walking in (d) start a fan when hot
11. 11.True or false: to keep an incubator warm, use a temperature sensor. (a) False (b) True
12. 12.Which job needs a buzzer? (a) open a gate to 90° (b) spin a robot’s wheels (c) beep an alarm (d) turn to an exact angle
13. 13.🔍 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)?
14. 14.🔍 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?
15. 15.Which job needs a gas sensor? (a) measure classroom noise (b) warn of a gas leak (c) switch on with a clap (d) stop a robot near walls
16. 16.🔍 An object is 255 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
17. 17.Which job needs a temperature sensor? (a) close a window in rain (b) stop a robot near walls (c) open blinds at sunrise (d) start a fan when hot
18. 18.🔍 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?
19. 19.🔍 An object is 34 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
20. 20.Which job needs a motor? (a) turn to an exact angle (b) spin a robot’s wheels (c) show a status light (d) beep an alarm
21. 21.🔍 Which sensor would you use to stop a robot near walls? (a) a rain sensor (b) a soil moisture sensor (c) a gas sensor (d) a distance sensor
22. 22.⚙️ Which actuator would you use to turn to an exact angle? (a) a motor (b) an LED (c) a servo motor (d) a pump
23. 23.True or false: to open blinds at sunrise, use a sound sensor. (a) True (b) False
24. 24.True or false: to spot someone walking in, use a motion sensor. (a) True (b) False
25. 25.🔍 For a microcontroller, is a sensor an input or an output? (a) a fuse (b) an input (c) a power source (d) an output
26. 26.⚙️ What is an actuator? (a) an output that acts (b) a battery (c) a sensor (d) a program
27. 27.⚙️ Which actuator would you use to beep an alarm? (a) a motor (b) a pump (c) a servo motor (d) a buzzer
28. 28.🔍 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)?
29. 29.True or false: to make a parking alarm, use a motion sensor. (a) True (b) False
30. 30.Which job needs a pump? (a) show a status light (b) open a gate to 90° (c) spin a robot’s wheels (d) move water to plants
31. 31.True or false: to stop a robot near walls, use a distance sensor. (a) True (b) False
32. 32.True or false: to open blinds at sunrise, use a light sensor. (a) False (b) True
33. 33.Which job needs a sound sensor? (a) measure classroom noise (b) close a window in rain (c) start a fan when hot (d) make a parking alarm
34. 34.🔍 Which sensor would you use to switch on lamps at dusk? (a) a temperature sensor (b) a light sensor (c) a soil moisture sensor (d) a motion sensor
35. 35.Which job needs a display? (a) show the temperature (b) move water to plants (c) beep an alarm (d) turn to an exact angle
36. 36.🔍 Which sensor would you use to make a parking alarm? (a) a light sensor (b) a rain sensor (c) a distance sensor (d) a gas sensor
37. 37.🔍 Which sensor would you use to switch on with a clap? (a) a sound sensor (b) a motion sensor (c) a temperature sensor (d) a light sensor
38. 38.🔍 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)?
39. 39.🔍 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)?
40. 40.🔍 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)?

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