Electronics Worksheet: Sensors and Actuators

Electronics lesson 26: Sensors and actuators · Set 107 · 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 spot someone walking in, use a distance sensor. (a) False (b) True
2. 2.🔍 For a microcontroller, is a sensor an input or an output? (a) an output (b) a power source (c) a fuse (d) an input
3. 3.⚙️ Which actuator would you use to move water to plants? (a) a servo motor (b) a motor (c) a pump (d) an LED
4. 4.Which job needs a soil moisture sensor? (a) stop a robot near walls (b) water a dry plant (c) switch on lamps at dusk (d) open blinds at sunrise
5. 5.Which job needs a servo motor? (a) show a status light (b) spin a robot’s wheels (c) show the temperature (d) open a gate to 90°
6. 6.Which job needs a temperature sensor? (a) close a window in rain (b) measure classroom noise (c) start a fan when hot (d) water a dry plant
7. 7.⚙️ Which actuator would you use to turn to an exact angle? (a) a motor (b) a pump (c) a servo motor (d) an LED
8. 8.🔍 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)?
9. 9.Which job needs a buzzer? (a) spin a robot’s wheels (b) open a gate to 90° (c) turn to an exact angle (d) beep an alarm
10. 10.⚙️ Which actuator would you use to beep an alarm? (a) a display (b) a buzzer (c) a motor (d) an LED
11. 11.🔍 Which sensor would you use to stop a robot near walls? (a) a rain sensor (b) a distance sensor (c) a temperature sensor (d) a sound sensor
12. 12.True or false: to start a fan when hot, use a temperature sensor. (a) False (b) True
13. 13.True or false: to switch on lamps at dusk, use a light sensor. (a) False (b) True
14. 14.🔍 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)?
15. 15.⚙️ What is an actuator? (a) an output that acts (b) a program (c) a battery (d) a sensor
16. 16.🔍 Which sensor would you use to start a fan when hot? (a) a temperature sensor (b) a soil moisture sensor (c) a distance sensor (d) a light sensor
17. 17.Which job needs a light sensor? (a) water a dry plant (b) close a window in rain (c) stop a robot near walls (d) open blinds at sunrise
18. 18.Which job needs a motion sensor? (a) close a window in rain (b) keep an incubator warm (c) start a fan when hot (d) spot someone walking in
19. 19.⚙️ Which actuator would you use to spin a robot’s wheels? (a) a buzzer (b) a display (c) a motor (d) an LED
20. 20.🔍 Which sensor would you use to switch on lamps at dusk? (a) a motion sensor (b) a light sensor (c) a rain sensor (d) a soil moisture sensor
21. 21.True or false: to switch on lamps at dusk, use a sound sensor. (a) False (b) True
22. 22.🔍 An object is 102 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
23. 23.🔍 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?
24. 24.🔍 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)?
25. 25.⚙️ Which actuator would you use to show a status light? (a) a motor (b) a buzzer (c) a display (d) an LED
26. 26.🔍 Which sensor would you use to water a dry plant? (a) a motion sensor (b) a soil moisture sensor (c) a distance sensor (d) a temperature sensor
27. 27.🔍 Which sensor would you use to keep an incubator warm? (a) a temperature sensor (b) a distance sensor (c) a sound sensor (d) a motion sensor
28. 28.True or false: to close a window in rain, use a temperature sensor. (a) False (b) True
29. 29.True or false: to close a window in rain, use a light sensor. (a) True (b) False
30. 30.Which job needs a display? (a) show a status light (b) show the temperature (c) beep an alarm (d) move water to plants
31. 31.Which job needs a motor? (a) open a gate to 90° (b) show the temperature (c) spin a robot’s wheels (d) move water to plants
32. 32.Which job needs a distance sensor? (a) start a fan when hot (b) stop a robot near walls (c) keep an incubator warm (d) switch on with a clap
33. 33.🔍 Which sensor would you use to make a parking alarm? (a) a motion sensor (b) a light sensor (c) a rain sensor (d) a distance sensor
34. 34.🔍 An object is 340 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) spin a robot’s wheels (b) open a gate to 90° (c) beep an alarm (d) show a status light
36. 36.🔍 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)?
37. 37.Which job needs a light sensor? (a) close a window in rain (b) water a dry plant (c) switch on lamps at dusk (d) keep an incubator warm
38. 38.Which job needs a distance sensor? (a) spot someone walking in (b) warn of a gas leak (c) make a parking alarm (d) start a fan when hot
39. 39.True or false: to water a dry plant, use a motion sensor. (a) False (b) True
40. 40.True or false: to water a dry plant, use a soil moisture sensor. (a) True (b) False

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