Electronics Worksheet: Sensors and Actuators

Electronics lesson 26: Sensors and actuators · Set 314 · 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 actuator would you use to turn to an exact angle? (a) a pump (b) a buzzer (c) a motor (d) a servo motor
2. 2.🔍 For a microcontroller, is a sensor an input or an output? (a) a fuse (b) an input (c) an output (d) a power source
3. 3.⚙️ Which actuator would you use to show the temperature? (a) a pump (b) a display (c) a buzzer (d) a servo motor
4. 4.🔍 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?
5. 5.Which job needs a light sensor? (a) switch on lamps at dusk (b) water a dry plant (c) stop a robot near walls (d) spot someone walking in
6. 6.True or false: to measure classroom noise, use a sound sensor. (a) False (b) True
7. 7.Which job needs a display? (a) show the temperature (b) move water to plants (c) open a gate to 90° (d) beep an alarm
8. 8.🔍 Which sensor would you use to measure classroom noise? (a) a light sensor (b) a sound sensor (c) a distance sensor (d) a soil moisture sensor
9. 9.⚙️ What is an actuator? (a) a battery (b) a sensor (c) a program (d) an output that acts
10. 10.🔍 Which sensor would you use to make a parking alarm? (a) a motion sensor (b) a gas sensor (c) a soil moisture sensor (d) a distance sensor
11. 11.⚙️ Which actuator would you use to spin a robot’s wheels? (a) a pump (b) a motor (c) a buzzer (d) an LED
12. 12.🔍 Which sensor would you use to switch on with a clap? (a) a soil moisture sensor (b) a temperature sensor (c) a motion sensor (d) a sound sensor
13. 13.Which job needs a sound sensor? (a) start a fan when hot (b) water a dry plant (c) measure classroom noise (d) open blinds at sunrise
14. 14.🔍 Which sensor would you use to start a fan when hot? (a) a distance sensor (b) a sound sensor (c) a motion sensor (d) a temperature sensor
15. 15.🔍 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)?
16. 16.🔍 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)?
17. 17.True or false: to keep an incubator warm, use a temperature sensor. (a) False (b) True
18. 18.True or false: to switch on lamps at dusk, use a temperature sensor. (a) True (b) False
19. 19.True or false: to keep an incubator warm, use a gas sensor. (a) False (b) True
20. 20.Which job needs a motor? (a) turn to an exact angle (b) spin a robot’s wheels (c) show the temperature (d) show a status light
21. 21.Which job needs a pump? (a) move water to plants (b) turn to an exact angle (c) open a gate to 90° (d) show a status light
22. 22.Which job needs a buzzer? (a) show the temperature (b) spin a robot’s wheels (c) turn to an exact angle (d) beep an alarm
23. 23.⚙️ Which actuator would you use to show a status light? (a) a pump (b) an LED (c) a servo motor (d) a display
24. 24.🔍 Which sensor would you use to switch on lamps at dusk? (a) a sound sensor (b) a motion sensor (c) a light sensor (d) a distance sensor
25. 25.🔍 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)?
26. 26.Which job needs a motion sensor? (a) start a fan when hot (b) switch on lamps at dusk (c) keep an incubator warm (d) spot someone walking in
27. 27.Which job needs a sound sensor? (a) open blinds at sunrise (b) switch on with a clap (c) start a fan when hot (d) spot someone walking in
28. 28.Which job needs a temperature sensor? (a) spot someone walking in (b) open blinds at sunrise (c) keep an incubator warm (d) close a window in rain
29. 29.🔍 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)?
30. 30.🔍 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)?
31. 31.True or false: to start a fan when hot, use a light sensor. (a) True (b) False
32. 32.Which job needs a servo motor? (a) move water to plants (b) open a gate to 90° (c) beep an alarm (d) show a status light
33. 33.True or false: to start a fan when hot, use a temperature sensor. (a) False (b) True
34. 34.🔍 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?
35. 35.Which job needs an LED? (a) turn to an exact angle (b) show a status light (c) beep an alarm (d) move water to plants
36. 36.Which job needs a soil moisture sensor? (a) keep an incubator warm (b) open blinds at sunrise (c) water a dry plant (d) switch on with a clap
37. 37.🔍 Which sensor would you use to stop a robot near walls? (a) a sound sensor (b) a gas sensor (c) a distance sensor (d) a temperature sensor
38. 38.Which job needs a rain sensor? (a) switch on with a clap (b) close a window in rain (c) start a fan when hot (d) switch on lamps at dusk
39. 39.Which job needs a distance sensor? (a) warn of a gas leak (b) keep an incubator warm (c) stop a robot near walls (d) spot someone walking in
40. 40.True or false: to water a dry plant, use a soil moisture sensor. (a) False (b) True

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