Electronics Worksheet: Sensors and Actuators

Electronics lesson 26: Sensors and actuators · Set 267 · 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 close a window in rain, use a motion sensor. (a) False (b) True
2. 2.🔍 A distance sensor sends a sound pulse and hears the echo 15 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
3. 3.🔍 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?
4. 4.True or false: to keep an incubator warm, use a light sensor. (a) True (b) False
5. 5.Which job needs a buzzer? (a) open a gate to 90° (b) move water to plants (c) spin a robot’s wheels (d) beep an alarm
6. 6.True or false: to switch on with a clap, use a sound sensor. (a) True (b) False
7. 7.True or false: to start a fan when hot, use a temperature sensor. (a) False (b) True
8. 8.⚙️ Which actuator would you use to move water to plants? (a) an LED (b) a pump (c) a motor (d) a display
9. 9.True or false: to switch on lamps at dusk, use a light sensor. (a) False (b) True
10. 10.🔍 For a microcontroller, is a sensor an input or an output? (a) a fuse (b) a power source (c) an input (d) an output
11. 11.⚙️ Which actuator would you use to show the temperature? (a) a pump (b) a servo motor (c) an LED (d) a display
12. 12.🔍 Which sensor would you use to warn of a gas leak? (a) a temperature sensor (b) a gas sensor (c) a distance sensor (d) a sound sensor
13. 13.Which job needs a motor? (a) spin a robot’s wheels (b) move water to plants (c) open a gate to 90° (d) beep an alarm
14. 14.🔍 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?
15. 15.Which job needs a sound sensor? (a) start a fan when hot (b) switch on lamps at dusk (c) switch on with a clap (d) warn of a gas leak
16. 16.⚙️ Which actuator would you use to turn to an exact angle? (a) a servo motor (b) a motor (c) a pump (d) a display
17. 17.🔍 Which sensor would you use to measure classroom noise? (a) a gas sensor (b) a temperature sensor (c) a soil moisture sensor (d) a sound sensor
18. 18.🔍 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)?
19. 19.🔍 Which sensor would you use to water a dry plant? (a) a soil moisture sensor (b) a motion sensor (c) a light sensor (d) a rain sensor
20. 20.Which job needs a sound sensor? (a) measure classroom noise (b) open blinds at sunrise (c) close a window in rain (d) warn of a gas leak
21. 21.Which job needs a rain sensor? (a) switch on lamps at dusk (b) start a fan when hot (c) spot someone walking in (d) close a window in rain
22. 22.🔍 A distance sensor sends a sound pulse and hears the echo 4 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
23. 23.True or false: to open blinds at sunrise, use a light sensor. (a) True (b) False
24. 24.True or false: to stop a robot near walls, use a temperature sensor. (a) False (b) True
25. 25.Which job needs a gas sensor? (a) start a fan when hot (b) warn of a gas leak (c) keep an incubator warm (d) water a dry plant
26. 26.🔍 Which sensor would you use to switch on with a clap? (a) a distance sensor (b) a sound sensor (c) a light sensor (d) a gas sensor
27. 27.Which job needs a temperature sensor? (a) stop a robot near walls (b) warn of a gas leak (c) measure classroom noise (d) start a fan when hot
28. 28.⚙️ Which actuator would you use to open a gate to 90°? (a) a servo motor (b) a motor (c) a buzzer (d) a pump
29. 29.Which job needs a distance sensor? (a) open blinds at sunrise (b) make a parking alarm (c) keep an incubator warm (d) close a window in rain
30. 30.True or false: to water a dry plant, use a light sensor. (a) False (b) True
31. 31.True or false: to switch on lamps at dusk, use a distance sensor. (a) True (b) False
32. 32.⚙️ What is an actuator? (a) a program (b) a sensor (c) a battery (d) an output that acts
33. 33.Which job needs a light sensor? (a) switch on with a clap (b) stop a robot near walls (c) open blinds at sunrise (d) warn of a gas leak
34. 34.🔍 Which sensor would you use to open blinds at sunrise? (a) a distance sensor (b) a sound sensor (c) a light sensor (d) a motion sensor
35. 35.🔍 Which sensor would you use to start a fan when hot? (a) a sound sensor (b) a light sensor (c) a soil moisture sensor (d) a temperature sensor
36. 36.⚙️ Which actuator would you use to spin a robot’s wheels? (a) a motor (b) a pump (c) a buzzer (d) a servo motor
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.🔍 Which sensor would you use to switch on lamps at dusk? (a) a rain sensor (b) a distance sensor (c) a motion sensor (d) a light sensor
39. 39.Which job needs an LED? (a) turn to an exact angle (b) move water to plants (c) show a status light (d) beep an alarm
40. 40.True or false: to stop a robot near walls, use a distance sensor. (a) False (b) True

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