Electronics Worksheet: Sensors and Actuators

Electronics lesson 26: Sensors and actuators · Set 151 · 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) open a gate to 90° (b) move water to plants (c) spin a robot’s wheels (d) show a status light
2. 2.Which job needs a servo motor? (a) open a gate to 90° (b) move water to plants (c) show a status light (d) spin a robot’s wheels
3. 3.Which job needs a gas sensor? (a) warn of a gas leak (b) close a window in rain (c) spot someone walking in (d) water a dry plant
4. 4.🔍 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?
5. 5.⚙️ What is an actuator? (a) a battery (b) an output that acts (c) a sensor (d) a program
6. 6.Which job needs a temperature sensor? (a) open blinds at sunrise (b) stop a robot near walls (c) keep an incubator warm (d) switch on with a clap
7. 7.⚙️ Which actuator would you use to move water to plants? (a) an LED (b) a pump (c) a buzzer (d) a servo motor
8. 8.Which job needs a distance sensor? (a) warn of a gas leak (b) switch on lamps at dusk (c) keep an incubator warm (d) make a parking alarm
9. 9.🔍 Which sensor would you use to start a fan when hot? (a) a motion sensor (b) a distance sensor (c) a sound sensor (d) a temperature sensor
10. 10.🔍 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?
11. 11.⚙️ Which actuator would you use to show the temperature? (a) an LED (b) a buzzer (c) a motor (d) a display
12. 12.Which job needs a rain sensor? (a) keep an incubator warm (b) switch on with a clap (c) close a window in rain (d) spot someone walking in
13. 13.Which job needs a display? (a) spin a robot’s wheels (b) show a status light (c) show the temperature (d) move water to plants
14. 14.🔍 Which sensor would you use to measure classroom noise? (a) a distance sensor (b) a sound sensor (c) a light sensor (d) a temperature sensor
15. 15.🔍 Which sensor would you use to keep an incubator warm? (a) a temperature sensor (b) a motion sensor (c) a gas sensor (d) a sound sensor
16. 16.True or false: to keep an incubator warm, use a temperature sensor. (a) True (b) False
17. 17.🔍 For a microcontroller, is a sensor an input or an output? (a) an output (b) a fuse (c) a power source (d) an input
18. 18.🔍 Which sensor would you use to warn of a gas leak? (a) a sound sensor (b) a rain sensor (c) a gas sensor (d) a light sensor
19. 19.Which job needs a pump? (a) turn to an exact angle (b) beep an alarm (c) spin a robot’s wheels (d) move water to plants
20. 20.⚙️ Which actuator would you use to open a gate to 90°? (a) a buzzer (b) a servo motor (c) a motor (d) a pump
21. 21.Which job needs a soil moisture sensor? (a) make a parking alarm (b) start a fan when hot (c) water a dry plant (d) switch on lamps at dusk
22. 22.Which job needs a sound sensor? (a) open blinds at sunrise (b) start a fan when hot (c) water a dry plant (d) measure classroom noise
23. 23.🔍 A distance sensor sends a sound pulse and hears the echo 13 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
24. 24.🔍 Which sensor would you use to water a dry plant? (a) a soil moisture sensor (b) a distance sensor (c) a sound sensor (d) a light sensor
25. 25.⚙️ Which actuator would you use to turn to an exact angle? (a) a display (b) a motor (c) a servo motor (d) an LED
26. 26.🔍 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?
27. 27.🔍 An object is 85 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
28. 28.Which job needs a light sensor? (a) spot someone walking in (b) start a fan when hot (c) switch on lamps at dusk (d) keep an incubator warm
29. 29.True or false: to warn of a gas leak, use a gas sensor. (a) False (b) True
30. 30.🔍 Which sensor would you use to switch on lamps at dusk? (a) a temperature sensor (b) a light sensor (c) a soil moisture sensor (d) a distance sensor
31. 31.Which job needs a motion sensor? (a) water a dry plant (b) start a fan when hot (c) open blinds at sunrise (d) spot someone walking in
32. 32.Which job needs a motor? (a) beep an alarm (b) show a status light (c) spin a robot’s wheels (d) move water to plants
33. 33.🔍 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?
34. 34.🔍 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?
35. 35.🔍 Which sensor would you use to switch on with a clap? (a) a sound sensor (b) a motion sensor (c) a rain sensor (d) a distance sensor
36. 36.⚙️ Which actuator would you use to spin a robot’s wheels? (a) a buzzer (b) a pump (c) a motor (d) a servo motor
37. 37.True or false: to start a fan when hot, use a temperature sensor. (a) False (b) True
38. 38.🔍 Which sensor would you use to stop a robot near walls? (a) a motion sensor (b) a light sensor (c) a sound sensor (d) a distance sensor
39. 39.🔍 An object is 68 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
40. 40.True or false: to open blinds at sunrise, use a distance sensor. (a) True (b) False

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