Electronics Worksheet: Sensors and Actuators

Electronics lesson 26: Sensors and actuators · Set 113 · 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.🔍 For a microcontroller, is a sensor an input or an output? (a) a power source (b) an output (c) an input (d) a fuse
2. 2.🔍 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?
3. 3.Which job needs a motor? (a) beep an alarm (b) spin a robot’s wheels (c) show a status light (d) turn to an exact angle
4. 4.Which job needs a display? (a) beep an alarm (b) move water to plants (c) turn to an exact angle (d) show the temperature
5. 5.⚙️ What is an actuator? (a) a sensor (b) a program (c) an output that acts (d) a battery
6. 6.⚙️ Which actuator would you use to open a gate to 90°? (a) a display (b) a buzzer (c) a pump (d) a servo motor
7. 7.Which job needs a gas sensor? (a) make a parking alarm (b) open blinds at sunrise (c) switch on lamps at dusk (d) warn of a gas leak
8. 8.🔍 A distance sensor sends a sound pulse and hears the echo 4 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
9. 9.🔍 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?
10. 10.True or false: to keep an incubator warm, use a temperature sensor. (a) True (b) False
11. 11.🔍 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)?
12. 12.True or false: to measure classroom noise, use a sound sensor. (a) True (b) False
13. 13.Which job needs a rain sensor? (a) start a fan when hot (b) keep an incubator warm (c) open blinds at sunrise (d) close a window in rain
14. 14.🔍 Which sensor would you use to keep an incubator warm? (a) a distance sensor (b) a rain sensor (c) a temperature sensor (d) a light sensor
15. 15.True or false: to warn of a gas leak, use a motion sensor. (a) False (b) True
16. 16.Which job needs a distance sensor? (a) open blinds at sunrise (b) spot someone walking in (c) keep an incubator warm (d) make a parking alarm
17. 17.⚙️ Which actuator would you use to show a status light? (a) a display (b) a servo motor (c) a motor (d) an LED
18. 18.Which job needs a temperature sensor? (a) switch on with a clap (b) stop a robot near walls (c) measure classroom noise (d) start a fan when hot
19. 19.Which job needs a soil moisture sensor? (a) switch on lamps at dusk (b) switch on with a clap (c) water a dry plant (d) measure classroom noise
20. 20.🔍 A distance sensor sends a sound pulse and hears the echo 16 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
21. 21.🔍 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?
22. 22.Which job needs a pump? (a) move water to plants (b) show the temperature (c) beep an alarm (d) show a status light
23. 23.Which job needs a sound sensor? (a) warn of a gas leak (b) measure classroom noise (c) switch on lamps at dusk (d) make a parking alarm
24. 24.🔍 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?
25. 25.🔍 Which sensor would you use to start a fan when hot? (a) a motion sensor (b) a sound sensor (c) a temperature sensor (d) a light sensor
26. 26.🔍 Which sensor would you use to spot someone walking in? (a) a distance sensor (b) a rain sensor (c) a light sensor (d) a motion sensor
27. 27.Which job needs a light sensor? (a) open blinds at sunrise (b) spot someone walking in (c) water a dry plant (d) start a fan when hot
28. 28.Which job needs an LED? (a) spin a robot’s wheels (b) show a status light (c) move water to plants (d) beep an alarm
29. 29.🔍 Which sensor would you use to make a parking alarm? (a) a distance sensor (b) a temperature sensor (c) a motion sensor (d) a sound sensor
30. 30.⚙️ Which actuator would you use to spin a robot’s wheels? (a) a servo motor (b) a pump (c) a motor (d) a buzzer
31. 31.🔍 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)?
32. 32.🔍 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?
33. 33.🔍 Which sensor would you use to close a window in rain? (a) a temperature sensor (b) a gas sensor (c) a sound sensor (d) a rain sensor
34. 34.True or false: to spot someone walking in, use a light sensor. (a) True (b) False
35. 35.🔍 Which sensor would you use to stop a robot near walls? (a) a gas sensor (b) a distance sensor (c) a light sensor (d) a sound sensor
36. 36.⚙️ Which actuator would you use to show the temperature? (a) an LED (b) a pump (c) a buzzer (d) a display
37. 37.🔍 Which sensor would you use to warn of a gas leak? (a) a light sensor (b) a gas sensor (c) a sound sensor (d) a temperature sensor
38. 38.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
39. 39.Which job needs a servo motor? (a) spin a robot’s wheels (b) turn to an exact angle (c) show a status light (d) show the temperature
40. 40.True or false: to open blinds at sunrise, use a rain sensor. (a) True (b) False

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