Electronics Worksheet: Sensors and Actuators

Electronics lesson 26: Sensors and actuators · Set 145 · 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 lamps at dusk, use a soil moisture sensor. (a) True (b) False
2. 2.Which job needs a motion sensor? (a) spot someone walking in (b) switch on with a clap (c) keep an incubator warm (d) stop a robot near walls
3. 3.🔍 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)?
4. 4.🔍 Which sensor would you use to switch on with a clap? (a) a motion sensor (b) a sound sensor (c) a soil moisture sensor (d) a distance sensor
5. 5.⚙️ What is an actuator? (a) a sensor (b) an output that acts (c) a battery (d) a program
6. 6.True or false: to open blinds at sunrise, use a light sensor. (a) True (b) False
7. 7.Which job needs a buzzer? (a) turn to an exact angle (b) show the temperature (c) beep an alarm (d) spin a robot’s wheels
8. 8.🔍 Which sensor would you use to start a fan when hot? (a) a motion sensor (b) a temperature sensor (c) a gas sensor (d) a distance sensor
9. 9.🔍 For a microcontroller, is a sensor an input or an output? (a) an input (b) a fuse (c) a power source (d) an output
10. 10.⚙️ Which actuator would you use to move water to plants? (a) a pump (b) a servo motor (c) a buzzer (d) a motor
11. 11.Which job needs a pump? (a) open a gate to 90° (b) show the temperature (c) move water to plants (d) beep an alarm
12. 12.🔍 Which sensor would you use to switch on lamps at dusk? (a) a motion sensor (b) a temperature sensor (c) a distance sensor (d) a light sensor
13. 13.Which job needs a temperature sensor? (a) switch on with a clap (b) warn of a gas leak (c) switch on lamps at dusk (d) start a fan when hot
14. 14.Which job needs a distance sensor? (a) warn of a gas leak (b) make a parking alarm (c) open blinds at sunrise (d) switch on with a clap
15. 15.⚙️ Which actuator would you use to turn to an exact angle? (a) a pump (b) a display (c) a servo motor (d) a motor
16. 16.⚙️ Which actuator would you use to show the temperature? (a) a servo motor (b) a motor (c) a pump (d) a display
17. 17.Which job needs a light sensor? (a) switch on with a clap (b) stop a robot near walls (c) close a window in rain (d) switch on lamps at dusk
18. 18.🔍 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?
19. 19.Which job needs a rain sensor? (a) switch on lamps at dusk (b) warn of a gas leak (c) close a window in rain (d) open blinds at sunrise
20. 20.True or false: to switch on lamps at dusk, use a light sensor. (a) False (b) True
21. 21.🔍 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?
22. 22.Which job needs a soil moisture sensor? (a) warn of a gas leak (b) make a parking alarm (c) water a dry plant (d) spot someone walking in
23. 23.🔍 Which sensor would you use to keep an incubator warm? (a) a temperature sensor (b) a rain sensor (c) a sound sensor (d) a distance sensor
24. 24.🔍 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)?
25. 25.Which job needs a motor? (a) show the temperature (b) spin a robot’s wheels (c) turn to an exact angle (d) move water to plants
26. 26.⚙️ Which actuator would you use to beep an alarm? (a) a pump (b) an LED (c) a servo motor (d) a buzzer
27. 27.Which job needs a display? (a) spin a robot’s wheels (b) turn to an exact angle (c) show the temperature (d) show a status light
28. 28.🔍 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)?
29. 29.🔍 Which sensor would you use to measure classroom noise? (a) a light sensor (b) a motion sensor (c) a rain sensor (d) a sound sensor
30. 30.Which job needs a servo motor? (a) spin a robot’s wheels (b) turn to an exact angle (c) show a status light (d) beep an alarm
31. 31.🔍 A distance sensor sends a sound pulse and hears the echo 12 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
32. 32.True or false: to start a fan when hot, use a sound sensor. (a) False (b) True
33. 33.Which job needs a sound sensor? (a) switch on with a clap (b) stop a robot near walls (c) keep an incubator warm (d) warn of a gas leak
34. 34.🔍 Which sensor would you use to stop a robot near walls? (a) a light sensor (b) a distance sensor (c) a sound sensor (d) a soil moisture sensor
35. 35.Which job needs a distance sensor? (a) water a dry plant (b) open blinds at sunrise (c) start a fan when hot (d) stop a robot near walls
36. 36.🔍 Which sensor would you use to water a dry plant? (a) a sound sensor (b) a distance sensor (c) a soil moisture sensor (d) a motion sensor
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.True or false: to open blinds at sunrise, use a sound sensor. (a) True (b) False
39. 39.🔍 A distance sensor sends a sound pulse and hears the echo 17 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
40. 40.🔍 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?

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