Electronics Worksheet: Sensors and Actuators

Electronics lesson 26: Sensors and actuators · Set 311 · 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 beep an alarm? (a) a motor (b) a buzzer (c) a display (d) a pump
2. 2.🔍 An object is 170 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
3. 3.True or false: to switch on with a clap, use a soil moisture sensor. (a) True (b) False
4. 4.Which job needs an LED? (a) show a status light (b) turn to an exact angle (c) show the temperature (d) open a gate to 90°
5. 5.🔍 Which sensor would you use to stop a robot near walls? (a) a rain sensor (b) a light sensor (c) a distance sensor (d) a temperature sensor
6. 6.⚙️ Which actuator would you use to turn to an exact angle? (a) a buzzer (b) a pump (c) a servo motor (d) a motor
7. 7.⚙️ What is an actuator? (a) a battery (b) an output that acts (c) a sensor (d) a program
8. 8.🔍 For a microcontroller, is a sensor an input or an output? (a) a fuse (b) an output (c) an input (d) a power source
9. 9.True or false: to keep an incubator warm, use a soil moisture sensor. (a) False (b) True
10. 10.Which job needs a distance sensor? (a) measure classroom noise (b) open blinds at sunrise (c) make a parking alarm (d) start a fan when hot
11. 11.🔍 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)?
12. 12.🔍 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?
13. 13.🔍 Which sensor would you use to spot someone walking in? (a) a sound sensor (b) a light sensor (c) a motion sensor (d) a distance sensor
14. 14.Which job needs a motor? (a) show the temperature (b) open a gate to 90° (c) beep an alarm (d) spin a robot’s wheels
15. 15.🔍 Which sensor would you use to switch on with a clap? (a) a soil moisture sensor (b) a gas sensor (c) a light sensor (d) a sound sensor
16. 16.True or false: to open blinds at sunrise, use a light sensor. (a) True (b) False
17. 17.Which job needs a temperature sensor? (a) open blinds at sunrise (b) spot someone walking in (c) make a parking alarm (d) start a fan when hot
18. 18.⚙️ Which actuator would you use to open a gate to 90°? (a) a buzzer (b) an LED (c) a servo motor (d) a display
19. 19.Which job needs a gas sensor? (a) spot someone walking in (b) warn of a gas leak (c) switch on lamps at dusk (d) close a window in rain
20. 20.⚙️ Which actuator would you use to show a status light? (a) a display (b) a motor (c) a pump (d) an LED
21. 21.⚙️ Which actuator would you use to show the temperature? (a) a display (b) an LED (c) a buzzer (d) a servo motor
22. 22.Which job needs a servo motor? (a) show a status light (b) show the temperature (c) move water to plants (d) open a gate to 90°
23. 23.True or false: to start a fan when hot, use a temperature sensor. (a) False (b) True
24. 24.True or false: to water a dry plant, use a light sensor. (a) False (b) True
25. 25.Which job needs a motion sensor? (a) switch on lamps at dusk (b) spot someone walking in (c) stop a robot near walls (d) measure classroom noise
26. 26.⚙️ Which actuator would you use to spin a robot’s wheels? (a) a motor (b) a display (c) an LED (d) a servo motor
27. 27.🔍 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)?
28. 28.True or false: to start a fan when hot, use a light sensor. (a) True (b) False
29. 29.True or false: to switch on lamps at dusk, use a light sensor. (a) True (b) False
30. 30.Which job needs a distance sensor? (a) stop a robot near walls (b) switch on lamps at dusk (c) spot someone walking in (d) keep an incubator warm
31. 31.True or false: to water a dry plant, use a soil moisture sensor. (a) True (b) False
32. 32.Which job needs a soil moisture sensor? (a) spot someone walking in (b) warn of a gas leak (c) water a dry plant (d) measure classroom noise
33. 33.True or false: to open blinds at sunrise, use a rain sensor. (a) True (b) False
34. 34.⚙️ Which actuator would you use to move water to plants? (a) a pump (b) a display (c) a servo motor (d) an LED
35. 35.🔍 Which sensor would you use to switch on lamps at dusk? (a) a gas sensor (b) a light sensor (c) a sound sensor (d) a rain sensor
36. 36.🔍 Which sensor would you use to start a fan when hot? (a) a soil moisture sensor (b) a rain sensor (c) a temperature sensor (d) a distance sensor
37. 37.Which job needs a display? (a) move water to plants (b) turn to an exact angle (c) show the temperature (d) open a gate to 90°
38. 38.Which job needs a light sensor? (a) measure classroom noise (b) spot someone walking in (c) switch on lamps at dusk (d) start a fan when hot
39. 39.🔍 Which sensor would you use to measure classroom noise? (a) a temperature sensor (b) a distance sensor (c) a sound sensor (d) a soil moisture sensor
40. 40.True or false: to stop a robot near walls, use a gas sensor. (a) False (b) True

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