Electronics Worksheet: Sensors and Actuators

Electronics lesson 26: Sensors and actuators · Set 302 · 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 job needs an LED? (a) beep an alarm (b) open a gate to 90° (c) show a status light (d) show the temperature
2. 2.⚙️ Which actuator would you use to spin a robot’s wheels? (a) a buzzer (b) a servo motor (c) a motor (d) a pump
3. 3.⚙️ What is an actuator? (a) a battery (b) an output that acts (c) a sensor (d) a program
4. 4.Which job needs a servo motor? (a) beep an alarm (b) move water to plants (c) open a gate to 90° (d) spin a robot’s wheels
5. 5.True or false: to spot someone walking in, use a motion sensor. (a) False (b) True
6. 6.⚙️ Which actuator would you use to move water to plants? (a) a buzzer (b) a servo motor (c) a pump (d) a display
7. 7.Which job needs a soil moisture sensor? (a) spot someone walking in (b) switch on lamps at dusk (c) make a parking alarm (d) water a dry plant
8. 8.Which job needs a display? (a) turn to an exact angle (b) show the temperature (c) move water to plants (d) beep an alarm
9. 9.🔍 Which sensor would you use to switch on lamps at dusk? (a) a soil moisture sensor (b) a light sensor (c) a temperature sensor (d) a sound sensor
10. 10.True or false: to stop a robot near walls, use a motion sensor. (a) True (b) False
11. 11.🔍 For a microcontroller, is a sensor an input or an output? (a) a fuse (b) an output (c) an input (d) a power source
12. 12.⚙️ Which actuator would you use to turn to an exact angle? (a) a servo motor (b) a motor (c) an LED (d) a display
13. 13.🔍 Which sensor would you use to spot someone walking in? (a) a light sensor (b) a gas sensor (c) a motion sensor (d) a sound sensor
14. 14.Which job needs a motor? (a) show a status light (b) spin a robot’s wheels (c) turn to an exact angle (d) show the temperature
15. 15.🔍 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)?
16. 16.Which job needs a sound sensor? (a) measure classroom noise (b) close a window in rain (c) keep an incubator warm (d) switch on lamps at dusk
17. 17.Which job needs a pump? (a) turn to an exact angle (b) show the temperature (c) open a gate to 90° (d) move water to plants
18. 18.⚙️ Which actuator would you use to show a status light? (a) a servo motor (b) a display (c) an LED (d) a motor
19. 19.⚙️ Which actuator would you use to open a gate to 90°? (a) a motor (b) a buzzer (c) a pump (d) a servo motor
20. 20.🔍 Which sensor would you use to stop a robot near walls? (a) a gas sensor (b) a sound sensor (c) a light sensor (d) a distance sensor
21. 21.🔍 An object is 51 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
22. 22.⚙️ Which actuator would you use to show the temperature? (a) a pump (b) a motor (c) a servo motor (d) a display
23. 23.🔍 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)?
24. 24.True or false: to make a parking alarm, use a rain sensor. (a) False (b) True
25. 25.🔍 A distance sensor sends a sound pulse and hears the echo 16 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
26. 26.🔍 An object is 119 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
27. 27.🔍 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)?
28. 28.🔍 An object is 255 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
29. 29.🔍 A distance sensor sends a sound pulse and hears the echo 20 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
30. 30.🔍 An object is 17 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
31. 31.🔍 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?
32. 32.Which job needs a gas sensor? (a) measure classroom noise (b) switch on with a clap (c) warn of a gas leak (d) stop a robot near walls
33. 33.Which job needs a buzzer? (a) show the temperature (b) turn to an exact angle (c) beep an alarm (d) open a gate to 90°
34. 34.🔍 Which sensor would you use to open blinds at sunrise? (a) a rain sensor (b) a motion sensor (c) a sound sensor (d) a light sensor
35. 35.True or false: to close a window in rain, use a temperature sensor. (a) True (b) False
36. 36.True or false: to measure classroom noise, use a motion sensor. (a) True (b) False
37. 37.🔍 Which sensor would you use to start a fan when hot? (a) a motion sensor (b) a temperature sensor (c) a rain sensor (d) a distance sensor
38. 38.True or false: to stop a robot near walls, use a gas sensor. (a) True (b) False
39. 39.🔍 A distance sensor sends a sound pulse and hears the echo 18 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
40. 40.🔍 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)?

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