Electronics Worksheet: Sensors and Actuators

Electronics lesson 26: Sensors and actuators · Set 130 · 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.True or false: to keep an incubator warm, use a temperature sensor. (a) True (b) False
2. 2.Which job needs a buzzer? (a) spin a robot’s wheels (b) beep an alarm (c) move water to plants (d) show the temperature
3. 3.True or false: to open blinds at sunrise, use a light sensor. (a) True (b) False
4. 4.🔍 Which sensor would you use to close a window in rain? (a) a gas sensor (b) a distance sensor (c) a rain sensor (d) a temperature sensor
5. 5.True or false: to switch on lamps at dusk, use a light sensor. (a) True (b) False
6. 6.⚙️ Which actuator would you use to show a status light? (a) a buzzer (b) a servo motor (c) a display (d) an LED
7. 7.🔍 For a microcontroller, is a sensor an input or an output? (a) a fuse (b) a power source (c) an input (d) an output
8. 8.Which job needs a display? (a) beep an alarm (b) show a status light (c) spin a robot’s wheels (d) show the temperature
9. 9.🔍 Which sensor would you use to water a dry plant? (a) a soil moisture sensor (b) a distance sensor (c) a light sensor (d) a motion sensor
10. 10.True or false: to water a dry plant, use a distance sensor. (a) True (b) False
11. 11.True or false: to measure classroom noise, use a distance sensor. (a) False (b) True
12. 12.🔍 A distance sensor sends a sound pulse and hears the echo 19 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
13. 13.True or false: to keep an incubator warm, use a distance sensor. (a) True (b) False
14. 14.⚙️ Which actuator would you use to beep an alarm? (a) an LED (b) a buzzer (c) a servo motor (d) a motor
15. 15.⚙️ What is an actuator? (a) a battery (b) a sensor (c) an output that acts (d) a program
16. 16.Which job needs a servo motor? (a) spin a robot’s wheels (b) show a status light (c) beep an alarm (d) open a gate to 90°
17. 17.⚙️ Which actuator would you use to spin a robot’s wheels? (a) a servo motor (b) an LED (c) a display (d) a motor
18. 18.🔍 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)?
19. 19.True or false: to make a parking alarm, use a distance sensor. (a) True (b) False
20. 20.🔍 Which sensor would you use to spot someone walking in? (a) a sound sensor (b) a motion sensor (c) a light sensor (d) a distance sensor
21. 21.🔍 Which sensor would you use to warn of a gas leak? (a) a sound sensor (b) a motion sensor (c) a distance sensor (d) a gas sensor
22. 22.🔍 Which sensor would you use to switch on with a clap? (a) a sound sensor (b) a temperature sensor (c) a gas sensor (d) a rain sensor
23. 23.🔍 Which sensor would you use to switch on lamps at dusk? (a) a motion sensor (b) a gas sensor (c) a light sensor (d) a temperature sensor
24. 24.⚙️ Which actuator would you use to move water to plants? (a) a display (b) a servo motor (c) a pump (d) a motor
25. 25.Which job needs a soil moisture sensor? (a) water a dry plant (b) keep an incubator warm (c) measure classroom noise (d) spot someone walking in
26. 26.True or false: to water a dry plant, use a temperature sensor. (a) False (b) True
27. 27.⚙️ Which actuator would you use to show the temperature? (a) a display (b) a servo motor (c) an LED (d) a buzzer
28. 28.True or false: to close a window in rain, use a rain sensor. (a) False (b) True
29. 29.Which job needs an LED? (a) turn to an exact angle (b) spin a robot’s wheels (c) show a status light (d) beep an alarm
30. 30.True or false: to warn of a gas leak, use a gas sensor. (a) False (b) True
31. 31.⚙️ Which actuator would you use to turn to an exact angle? (a) a buzzer (b) a servo motor (c) a motor (d) a display
32. 32.🔍 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)?
33. 33.True or false: to stop a robot near walls, use a distance sensor. (a) True (b) False
34. 34.Which job needs a motion sensor? (a) open blinds at sunrise (b) start a fan when hot (c) spot someone walking in (d) warn of a gas leak
35. 35.🔍 Which sensor would you use to stop a robot near walls? (a) a sound sensor (b) a motion sensor (c) a temperature sensor (d) a distance sensor
36. 36.True or false: to switch on lamps at dusk, use a sound sensor. (a) True (b) False
37. 37.🔍 Which sensor would you use to make a parking alarm? (a) a gas sensor (b) a light sensor (c) a sound sensor (d) a distance sensor
38. 38.⚙️ Which actuator would you use to open a gate to 90°? (a) a display (b) a servo motor (c) a motor (d) a pump
39. 39.🔍 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?
40. 40.🔍 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?

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