Electronics Worksheet: Sensors and Actuators

Electronics lesson 26: Sensors and actuators · Set 319 · 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 turn to an exact angle? (a) a buzzer (b) a display (c) a servo motor (d) an LED
2. 2.🔍 For a microcontroller, is a sensor an input or an output? (a) a fuse (b) a power source (c) an output (d) an input
3. 3.🔍 Which sensor would you use to switch on with a clap? (a) a gas sensor (b) a light sensor (c) a sound sensor (d) a rain sensor
4. 4.Which job needs a gas sensor? (a) switch on with a clap (b) warn of a gas leak (c) switch on lamps at dusk (d) stop a robot near walls
5. 5.Which job needs a servo motor? (a) show a status light (b) show the temperature (c) turn to an exact angle (d) beep an alarm
6. 6.True or false: to switch on with a clap, use a soil moisture sensor. (a) False (b) True
7. 7.Which job needs a display? (a) move water to plants (b) show the temperature (c) spin a robot’s wheels (d) turn to an exact angle
8. 8.Which job needs a pump? (a) spin a robot’s wheels (b) move water to plants (c) beep an alarm (d) turn to an exact angle
9. 9.🔍 Which sensor would you use to spot someone walking in? (a) a distance sensor (b) a motion sensor (c) a temperature sensor (d) a rain sensor
10. 10.True or false: to measure classroom noise, use a temperature sensor. (a) False (b) True
11. 11.True or false: to switch on lamps at dusk, use a soil moisture sensor. (a) False (b) True
12. 12.🔍 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?
13. 13.⚙️ What is an actuator? (a) a sensor (b) an output that acts (c) a program (d) a battery
14. 14.Which job needs a buzzer? (a) spin a robot’s wheels (b) move water to plants (c) beep an alarm (d) turn to an exact angle
15. 15.🔍 Which sensor would you use to open blinds at sunrise? (a) a light sensor (b) a temperature sensor (c) a motion sensor (d) a distance sensor
16. 16.🔍 Which sensor would you use to switch on lamps at dusk? (a) a distance sensor (b) a soil moisture sensor (c) a light sensor (d) a rain sensor
17. 17.True or false: to measure classroom noise, use a sound sensor. (a) False (b) True
18. 18.🔍 Which sensor would you use to keep an incubator warm? (a) a soil moisture sensor (b) a temperature sensor (c) a gas sensor (d) a light sensor
19. 19.True or false: to switch on lamps at dusk, use a temperature sensor. (a) True (b) False
20. 20.Which job needs a motor? (a) show the temperature (b) move water to plants (c) spin a robot’s wheels (d) turn to an exact angle
21. 21.🔍 Which sensor would you use to close a window in rain? (a) a soil moisture sensor (b) a motion sensor (c) a rain sensor (d) a temperature sensor
22. 22.True or false: to warn of a gas leak, use a gas sensor. (a) True (b) False
23. 23.True or false: to close a window in rain, use a soil moisture sensor. (a) True (b) False
24. 24.True or false: to stop a robot near walls, use a soil moisture sensor. (a) True (b) False
25. 25.🔍 A distance sensor sends a sound pulse and hears the echo 9 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
26. 26.🔍 An object is 272 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
27. 27.🔍 Which sensor would you use to water a dry plant? (a) a distance sensor (b) a sound sensor (c) a temperature sensor (d) a soil moisture sensor
28. 28.True or false: to spot someone walking in, use a light sensor. (a) True (b) False
29. 29.⚙️ Which actuator would you use to open a gate to 90°? (a) a buzzer (b) a servo motor (c) a motor (d) a pump
30. 30.⚙️ Which actuator would you use to spin a robot’s wheels? (a) a buzzer (b) a display (c) a servo motor (d) a motor
31. 31.🔍 Which sensor would you use to start a fan when hot? (a) a distance sensor (b) a light sensor (c) a gas sensor (d) a temperature sensor
32. 32.🔍 Which sensor would you use to stop a robot near walls? (a) a distance sensor (b) a motion sensor (c) a gas sensor (d) a light sensor
33. 33.Which job needs a sound sensor? (a) close a window in rain (b) open blinds at sunrise (c) warn of a gas leak (d) switch on with a clap
34. 34.Which job needs a motion sensor? (a) open blinds at sunrise (b) warn of a gas leak (c) spot someone walking in (d) close a window in rain
35. 35.Which job needs a light sensor? (a) stop a robot near walls (b) switch on lamps at dusk (c) warn of a gas leak (d) make a parking alarm
36. 36.Which job needs a temperature sensor? (a) start a fan when hot (b) stop a robot near walls (c) measure classroom noise (d) spot someone walking in
37. 37.⚙️ Which actuator would you use to show the temperature? (a) a display (b) a buzzer (c) an LED (d) a servo motor
38. 38.🔍 A distance sensor sends a sound pulse and hears the echo 5 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
39. 39.Which job needs a distance sensor? (a) keep an incubator warm (b) warn of a gas leak (c) make a parking alarm (d) start a fan when hot
40. 40.True or false: to open blinds at sunrise, use a temperature sensor. (a) False (b) True

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