Electronics Worksheet: Sensors and Actuators

Electronics lesson 26: Sensors and actuators · Set 238 · 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.🔍 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?
2. 2.🔍 Which sensor would you use to open blinds at sunrise? (a) a distance sensor (b) a gas sensor (c) a sound sensor (d) a light sensor
3. 3.⚙️ Which actuator would you use to turn to an exact angle? (a) a buzzer (b) a motor (c) an LED (d) a servo motor
4. 4.Which job needs a buzzer? (a) open a gate to 90° (b) show a status light (c) spin a robot’s wheels (d) beep an alarm
5. 5.🔍 An object is 204 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
6. 6.🔍 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?
7. 7.🔍 An object is 221 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
8. 8.🔍 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?
9. 9.Which job needs a light sensor? (a) open blinds at sunrise (b) close a window in rain (c) switch on with a clap (d) stop a robot near walls
10. 10.🔍 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?
11. 11.🔍 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)?
12. 12.🔍 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?
13. 13.⚙️ What is an actuator? (a) a battery (b) a sensor (c) a program (d) an output that acts
14. 14.Which job needs a servo motor? (a) show the temperature (b) spin a robot’s wheels (c) open a gate to 90° (d) move water to plants
15. 15.🔍 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)?
16. 16.Which job needs a temperature sensor? (a) switch on with a clap (b) close a window in rain (c) spot someone walking in (d) keep an incubator warm
17. 17.🔍 Which sensor would you use to spot someone walking in? (a) a light sensor (b) a rain sensor (c) a gas sensor (d) a motion sensor
18. 18.Which job needs a sound sensor? (a) switch on lamps at dusk (b) make a parking alarm (c) spot someone walking in (d) measure classroom noise
19. 19.Which job needs a servo motor? (a) spin a robot’s wheels (b) show the temperature (c) move water to plants (d) turn to an exact angle
20. 20.🔍 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?
21. 21.True or false: to water a dry plant, use a light sensor. (a) True (b) False
22. 22.True or false: to stop a robot near walls, use a light sensor. (a) True (b) False
23. 23.True or false: to switch on with a clap, use a sound sensor. (a) False (b) True
24. 24.🔍 For a microcontroller, is a sensor an input or an output? (a) a power source (b) an input (c) an output (d) a fuse
25. 25.Which job needs a temperature sensor? (a) switch on with a clap (b) spot someone walking in (c) make a parking alarm (d) start a fan when hot
26. 26.🔍 A distance sensor sends a sound pulse and hears the echo 18 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
27. 27.🔍 Which sensor would you use to switch on lamps at dusk? (a) a light sensor (b) a gas sensor (c) a distance sensor (d) a motion sensor
28. 28.🔍 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)?
29. 29.True or false: to measure classroom noise, use a temperature sensor. (a) False (b) True
30. 30.🔍 Which sensor would you use to water a dry plant? (a) a motion sensor (b) a soil moisture sensor (c) a gas sensor (d) a distance sensor
31. 31.Which job needs an LED? (a) show a status light (b) move water to plants (c) beep an alarm (d) spin a robot’s wheels
32. 32.True or false: to keep an incubator warm, use a soil moisture sensor. (a) False (b) True
33. 33.⚙️ Which actuator would you use to open a gate to 90°? (a) an LED (b) a pump (c) a display (d) a servo motor
34. 34.Which job needs a motor? (a) beep an alarm (b) spin a robot’s wheels (c) show the temperature (d) turn to an exact angle
35. 35.True or false: to open blinds at sunrise, use a distance sensor. (a) False (b) True
36. 36.🔍 Which sensor would you use to stop a robot near walls? (a) a light sensor (b) a gas sensor (c) a sound sensor (d) a distance sensor
37. 37.True or false: to warn of a gas leak, use a gas sensor. (a) False (b) True
38. 38.⚙️ Which actuator would you use to show a status light? (a) an LED (b) a buzzer (c) a display (d) a motor
39. 39.Which job needs a pump? (a) spin a robot’s wheels (b) move water to plants (c) show the temperature (d) show a status light
40. 40.Which job needs a display? (a) show the temperature (b) show a status light (c) move water to plants (d) open a gate to 90°

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