Electronics Worksheet: Sensors and Actuators

Electronics lesson 26: Sensors and actuators · Set 279 · 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 switch on with a clap, use a sound sensor. (a) True (b) False
2. 2.🔍 An object is 272 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
3. 3.Which job needs an LED? (a) show the temperature (b) open a gate to 90° (c) turn to an exact angle (d) show a status light
4. 4.⚙️ What is an actuator? (a) a program (b) an output that acts (c) a sensor (d) a battery
5. 5.True or false: to make a parking alarm, use a sound sensor. (a) False (b) True
6. 6.Which job needs a motion sensor? (a) spot someone walking in (b) stop a robot near walls (c) start a fan when hot (d) make a parking alarm
7. 7.True or false: to open blinds at sunrise, use a light sensor. (a) True (b) False
8. 8.Which job needs a motor? (a) show a status light (b) show the temperature (c) spin a robot’s wheels (d) beep an alarm
9. 9.Which job needs a display? (a) beep an alarm (b) move water to plants (c) show the temperature (d) turn to an exact angle
10. 10.Which job needs a light sensor? (a) keep an incubator warm (b) switch on lamps at dusk (c) close a window in rain (d) make a parking alarm
11. 11.🔍 For a microcontroller, is a sensor an input or an output? (a) a power source (b) a fuse (c) an input (d) an output
12. 12.⚙️ Which actuator would you use to spin a robot’s wheels? (a) a motor (b) a display (c) a servo motor (d) an LED
13. 13.Which job needs a distance sensor? (a) switch on lamps at dusk (b) water a dry plant (c) make a parking alarm (d) measure classroom noise
14. 14.🔍 An object is 153 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
15. 15.True or false: to water a dry plant, use a soil moisture sensor. (a) False (b) True
16. 16.⚙️ Which actuator would you use to open a gate to 90°? (a) a buzzer (b) a servo motor (c) a motor (d) a pump
17. 17.⚙️ Which actuator would you use to turn to an exact angle? (a) a buzzer (b) a motor (c) a pump (d) a servo motor
18. 18.True or false: to measure classroom noise, use a sound sensor. (a) True (b) False
19. 19.Which job needs a rain sensor? (a) switch on lamps at dusk (b) stop a robot near walls (c) make a parking alarm (d) close a window in rain
20. 20.🔍 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)?
21. 21.🔍 Which sensor would you use to open blinds at sunrise? (a) a sound sensor (b) a soil moisture sensor (c) a light sensor (d) a gas sensor
22. 22.🔍 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?
23. 23.🔍 An object is 289 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
24. 24.🔍 Which sensor would you use to measure classroom noise? (a) a sound sensor (b) a gas sensor (c) a motion sensor (d) a temperature sensor
25. 25.⚙️ Which actuator would you use to move water to plants? (a) a pump (b) a buzzer (c) a servo motor (d) a motor
26. 26.Which job needs a distance sensor? (a) keep an incubator warm (b) measure classroom noise (c) stop a robot near walls (d) spot someone walking in
27. 27.⚙️ Which actuator would you use to show the temperature? (a) an LED (b) a motor (c) a display (d) a buzzer
28. 28.🔍 Which sensor would you use to start a fan when hot? (a) a soil moisture sensor (b) a temperature sensor (c) a distance sensor (d) a gas sensor
29. 29.🔍 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?
30. 30.Which job needs a light sensor? (a) spot someone walking in (b) make a parking alarm (c) open blinds at sunrise (d) warn of a gas leak
31. 31.True or false: to stop a robot near walls, use a motion sensor. (a) True (b) False
32. 32.True or false: to warn of a gas leak, use a gas sensor. (a) True (b) False
33. 33.🔍 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)?
34. 34.Which job needs a pump? (a) open a gate to 90° (b) move water to plants (c) turn to an exact angle (d) spin a robot’s wheels
35. 35.Which job needs a buzzer? (a) beep an alarm (b) open a gate to 90° (c) show a status light (d) turn to an exact angle
36. 36.True or false: to keep an incubator warm, use a sound sensor. (a) True (b) False
37. 37.🔍 A distance sensor sends a sound pulse and hears the echo 11 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
38. 38.True or false: to make a parking alarm, use a distance sensor. (a) True (b) False
39. 39.🔍 Which sensor would you use to stop a robot near walls? (a) a gas sensor (b) a temperature sensor (c) a distance sensor (d) a sound sensor
40. 40.🔍 A distance sensor sends a sound pulse and hears the echo 10 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?

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