Electronics Worksheet: Sensors and Actuators

Electronics lesson 26: Sensors and actuators · Set 283 · 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 make a parking alarm, use a distance sensor. (a) False (b) True
2. 2.🔍 Which sensor would you use to make a parking alarm? (a) a sound sensor (b) a rain sensor (c) a light sensor (d) a distance sensor
3. 3.🔍 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)?
4. 4.🔍 Which sensor would you use to switch on with a clap? (a) a sound sensor (b) a motion sensor (c) a light sensor (d) a temperature sensor
5. 5.🔍 Which sensor would you use to start a fan when hot? (a) a gas sensor (b) a rain sensor (c) a temperature sensor (d) a sound sensor
6. 6.True or false: to water a dry plant, use a soil moisture sensor. (a) False (b) True
7. 7.⚙️ What is an actuator? (a) a sensor (b) an output that acts (c) a battery (d) a program
8. 8.🔍 Which sensor would you use to switch on lamps at dusk? (a) a soil moisture sensor (b) a light sensor (c) a sound sensor (d) a temperature sensor
9. 9.🔍 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?
10. 10.True or false: to stop a robot near walls, use a light sensor. (a) True (b) False
11. 11.⚙️ Which actuator would you use to spin a robot’s wheels? (a) a pump (b) a servo motor (c) a motor (d) a display
12. 12.⚙️ Which actuator would you use to move water to plants? (a) a servo motor (b) an LED (c) a buzzer (d) a pump
13. 13.🔍 Which sensor would you use to spot someone walking in? (a) a distance sensor (b) a soil moisture sensor (c) a light sensor (d) a motion sensor
14. 14.Which job needs a gas sensor? (a) switch on lamps at dusk (b) keep an incubator warm (c) warn of a gas leak (d) measure classroom noise
15. 15.⚙️ Which actuator would you use to open a gate to 90°? (a) an LED (b) a buzzer (c) a motor (d) a servo motor
16. 16.🔍 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?
17. 17.True or false: to warn of a gas leak, use a gas sensor. (a) True (b) False
18. 18.Which job needs a distance sensor? (a) make a parking alarm (b) switch on with a clap (c) water a dry plant (d) warn of a gas leak
19. 19.🔍 An object is 238 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
20. 20.🔍 Which sensor would you use to measure classroom noise? (a) a light sensor (b) a distance sensor (c) a temperature sensor (d) a sound sensor
21. 21.🔍 For a microcontroller, is a sensor an input or an output? (a) a fuse (b) an output (c) a power source (d) an input
22. 22.🔍 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?
23. 23.Which job needs a light sensor? (a) start a fan when hot (b) open blinds at sunrise (c) water a dry plant (d) warn of a gas leak
24. 24.🔍 Which sensor would you use to open blinds at sunrise? (a) a distance sensor (b) a rain sensor (c) a motion sensor (d) a light sensor
25. 25.🔍 Which sensor would you use to close a window in rain? (a) a temperature sensor (b) a light sensor (c) a gas sensor (d) a rain sensor
26. 26.Which job needs a pump? (a) show the temperature (b) spin a robot’s wheels (c) turn to an exact angle (d) move water to plants
27. 27.⚙️ Which actuator would you use to show the temperature? (a) an LED (b) a pump (c) a servo motor (d) a display
28. 28.True or false: to start a fan when hot, use a gas sensor. (a) True (b) False
29. 29.Which job needs a sound sensor? (a) switch on lamps at dusk (b) switch on with a clap (c) start a fan when hot (d) water a dry plant
30. 30.🔍 A distance sensor sends a sound pulse and hears the echo 1 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
31. 31.⚙️ Which actuator would you use to show a status light? (a) a motor (b) a servo motor (c) an LED (d) a buzzer
32. 32.Which job needs a display? (a) open a gate to 90° (b) move water to plants (c) turn to an exact angle (d) show the temperature
33. 33.Which job needs a motion sensor? (a) start a fan when hot (b) water a dry plant (c) spot someone walking in (d) make a parking alarm
34. 34.Which job needs a distance sensor? (a) open blinds at sunrise (b) measure classroom noise (c) keep an incubator warm (d) stop a robot near walls
35. 35.Which job needs a rain sensor? (a) measure classroom noise (b) switch on lamps at dusk (c) close a window in rain (d) open blinds at sunrise
36. 36.🔍 Which sensor would you use to water a dry plant? (a) a distance sensor (b) a light sensor (c) a motion sensor (d) a soil moisture sensor
37. 37.🔍 An object is 306 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
38. 38.Which job needs a temperature sensor? (a) water a dry plant (b) measure classroom noise (c) close a window in rain (d) keep an incubator warm
39. 39.🔍 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?
40. 40.Which job needs a servo motor? (a) open a gate to 90° (b) beep an alarm (c) show the temperature (d) move water to plants

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