Electronics Worksheet: Sensors and Actuators

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

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