Electronics Worksheet: Sensors and Actuators

Electronics lesson 26: Sensors and actuators · Set 176 · 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) an output (b) an input (c) a fuse (d) a power source
2. 2.⚙️ What is an actuator? (a) a battery (b) a sensor (c) a program (d) an output that acts
3. 3.⚙️ Which actuator would you use to show the temperature? (a) a buzzer (b) a display (c) a servo motor (d) a pump
4. 4.Which job needs a motor? (a) move water to plants (b) show a status light (c) show the temperature (d) spin a robot’s wheels
5. 5.🔍 Which sensor would you use to close a window in rain? (a) a distance sensor (b) a light sensor (c) a temperature sensor (d) a rain sensor
6. 6.🔍 Which sensor would you use to open blinds at sunrise? (a) a distance sensor (b) a soil moisture sensor (c) a temperature sensor (d) a light sensor
7. 7.Which job needs a light sensor? (a) stop a robot near walls (b) start a fan when hot (c) open blinds at sunrise (d) make a parking alarm
8. 8.🔍 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?
9. 9.🔍 Which sensor would you use to start a fan when hot? (a) a motion sensor (b) a temperature sensor (c) a gas sensor (d) a distance sensor
10. 10.⚙️ Which actuator would you use to beep an alarm? (a) a buzzer (b) a pump (c) an LED (d) a motor
11. 11.True or false: to keep an incubator warm, use a motion sensor. (a) False (b) True
12. 12.True or false: to close a window in rain, use a rain sensor. (a) True (b) False
13. 13.🔍 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)?
14. 14.🔍 Which sensor would you use to switch on lamps at dusk? (a) a light sensor (b) a distance sensor (c) a gas sensor (d) a motion sensor
15. 15.⚙️ Which actuator would you use to open a gate to 90°? (a) a buzzer (b) a servo motor (c) a motor (d) a pump
16. 16.🔍 Which sensor would you use to measure classroom noise? (a) a motion sensor (b) a temperature sensor (c) a sound sensor (d) a gas sensor
17. 17.🔍 Which sensor would you use to water a dry plant? (a) a distance sensor (b) a sound sensor (c) a soil moisture sensor (d) a temperature sensor
18. 18.True or false: to warn of a gas leak, use a gas sensor. (a) True (b) False
19. 19.Which job needs a buzzer? (a) spin a robot’s wheels (b) show the temperature (c) beep an alarm (d) move water to plants
20. 20.True or false: to start a fan when hot, use a light sensor. (a) True (b) False
21. 21.⚙️ Which actuator would you use to show a status light? (a) a servo motor (b) an LED (c) a motor (d) a pump
22. 22.Which job needs a rain sensor? (a) close a window in rain (b) make a parking alarm (c) open blinds at sunrise (d) warn of a gas leak
23. 23.🔍 Which sensor would you use to keep an incubator warm? (a) a temperature sensor (b) a light sensor (c) a sound sensor (d) a rain sensor
24. 24.🔍 An object is 323 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
25. 25.Which job needs a temperature sensor? (a) make a parking alarm (b) open blinds at sunrise (c) keep an incubator warm (d) stop a robot near walls
26. 26.True or false: to start a fan when hot, use a temperature sensor. (a) True (b) False
27. 27.🔍 Which sensor would you use to make a parking alarm? (a) a gas sensor (b) a temperature sensor (c) a distance sensor (d) a sound sensor
28. 28.Which job needs a soil moisture sensor? (a) spot someone walking in (b) start a fan when hot (c) measure classroom noise (d) water a dry plant
29. 29.True or false: to start a fan when hot, use a rain sensor. (a) False (b) True
30. 30.True or false: to measure classroom noise, use a temperature sensor. (a) True (b) False
31. 31.Which job needs an LED? (a) turn to an exact angle (b) move water to plants (c) open a gate to 90° (d) show a status light
32. 32.Which job needs a distance sensor? (a) warn of a gas leak (b) stop a robot near walls (c) switch on with a clap (d) close a window in rain
33. 33.⚙️ Which actuator would you use to turn to an exact angle? (a) a pump (b) a servo motor (c) a buzzer (d) a display
34. 34.Which job needs a display? (a) show a status light (b) spin a robot’s wheels (c) show the temperature (d) beep an alarm
35. 35.⚙️ Which actuator would you use to move water to plants? (a) a pump (b) a servo motor (c) an LED (d) a display
36. 36.🔍 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)?
37. 37.🔍 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?
38. 38.🔍 An object is 68 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 keep an incubator warm, use a temperature sensor. (a) True (b) False
40. 40.Which job needs a light sensor? (a) measure classroom noise (b) switch on lamps at dusk (c) spot someone walking in (d) water a dry plant

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