Electronics Worksheet: Sensors and Actuators

Electronics lesson 26: Sensors and actuators · Set 232 · 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 221 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
2. 2.⚙️ Which actuator would you use to turn to an exact angle? (a) a servo motor (b) an LED (c) a display (d) a motor
3. 3.⚙️ Which actuator would you use to show the temperature? (a) a pump (b) a servo motor (c) an LED (d) a display
4. 4.Which job needs a display? (a) show the temperature (b) beep an alarm (c) move water to plants (d) turn to an exact angle
5. 5.True or false: to make a parking alarm, use a distance sensor. (a) True (b) False
6. 6.⚙️ Which actuator would you use to move water to plants? (a) an LED (b) a motor (c) a pump (d) a servo motor
7. 7.🔍 Which sensor would you use to stop a robot near walls? (a) a distance sensor (b) a rain sensor (c) a light sensor (d) a soil moisture sensor
8. 8.True or false: to switch on with a clap, use a distance sensor. (a) False (b) True
9. 9.🔍 Which sensor would you use to close a window in rain? (a) a temperature sensor (b) a light sensor (c) a soil moisture sensor (d) a rain sensor
10. 10.🔍 Which sensor would you use to spot someone walking in? (a) a sound sensor (b) a light sensor (c) a distance sensor (d) a motion sensor
11. 11.True or false: to open blinds at sunrise, use a rain sensor. (a) False (b) True
12. 12.Which job needs a temperature sensor? (a) keep an incubator warm (b) water a dry plant (c) open blinds at sunrise (d) spot someone walking in
13. 13.🔍 Which sensor would you use to measure classroom noise? (a) a temperature sensor (b) a gas sensor (c) a sound sensor (d) a motion sensor
14. 14.🔍 A distance sensor sends a sound pulse and hears the echo 17 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
15. 15.Which job needs a distance sensor? (a) measure classroom noise (b) start a fan when hot (c) open blinds at sunrise (d) stop a robot near walls
16. 16.Which job needs a servo motor? (a) beep an alarm (b) open a gate to 90° (c) show a status light (d) move water to plants
17. 17.🔍 An object is 119 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
18. 18.🔍 An object is 187 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
19. 19.🔍 Which sensor would you use to switch on lamps at dusk? (a) a soil moisture sensor (b) a light sensor (c) a sound sensor (d) a distance sensor
20. 20.🔍 For a microcontroller, is a sensor an input or an output? (a) an output (b) a power source (c) a fuse (d) an input
21. 21.⚙️ What is an actuator? (a) an output that acts (b) a program (c) a battery (d) a sensor
22. 22.⚙️ Which actuator would you use to beep an alarm? (a) a pump (b) a servo motor (c) a buzzer (d) an LED
23. 23.Which job needs a soil moisture sensor? (a) water a dry plant (b) close a window in rain (c) keep an incubator warm (d) switch on lamps at dusk
24. 24.🔍 Which sensor would you use to switch on with a clap? (a) a motion sensor (b) a light sensor (c) a sound sensor (d) a soil moisture sensor
25. 25.Which job needs a light sensor? (a) make a parking alarm (b) keep an incubator warm (c) close a window in rain (d) switch on lamps at dusk
26. 26.Which job needs a pump? (a) move water to plants (b) spin a robot’s wheels (c) open a gate to 90° (d) beep an alarm
27. 27.🔍 An object is 289 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
28. 28.🔍 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)?
29. 29.Which job needs a rain sensor? (a) make a parking alarm (b) start a fan when hot (c) close a window in rain (d) spot someone walking in
30. 30.Which job needs an LED? (a) move water to plants (b) spin a robot’s wheels (c) show a status light (d) beep an alarm
31. 31.True or false: to make a parking alarm, use a rain sensor. (a) True (b) False
32. 32.🔍 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?
33. 33.Which job needs a motor? (a) turn to an exact angle (b) move water to plants (c) spin a robot’s wheels (d) show a status light
34. 34.Which job needs a distance sensor? (a) spot someone walking in (b) switch on lamps at dusk (c) open blinds at sunrise (d) make a parking alarm
35. 35.True or false: to measure classroom noise, use a sound sensor. (a) True (b) False
36. 36.True or false: to spot someone walking in, use a rain sensor. (a) True (b) False
37. 37.Which job needs a servo motor? (a) turn to an exact angle (b) show the temperature (c) beep an alarm (d) move water to plants
38. 38.🔍 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?
39. 39.True or false: to warn of a gas leak, use a gas sensor. (a) True (b) False
40. 40.True or false: to warn of a gas leak, use a rain sensor. (a) True (b) False

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