Electronics Worksheet: Sensors and Actuators

Electronics lesson 26: Sensors and actuators · Set 230 · 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 open a gate to 90°? (a) a motor (b) an LED (c) a display (d) a servo motor
2. 2.🔍 Which sensor would you use to switch on lamps at dusk? (a) a gas sensor (b) a light sensor (c) a rain sensor (d) a motion sensor
3. 3.🔍 For a microcontroller, is a sensor an input or an output? (a) an output (b) a power source (c) a fuse (d) an input
4. 4.Which job needs a gas sensor? (a) start a fan when hot (b) switch on lamps at dusk (c) make a parking alarm (d) warn of a gas leak
5. 5.🔍 An object is 187 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
6. 6.🔍 Which sensor would you use to warn of a gas leak? (a) a rain sensor (b) a distance sensor (c) a light sensor (d) a gas sensor
7. 7.Which job needs an LED? (a) beep an alarm (b) turn to an exact angle (c) show a status light (d) open a gate to 90°
8. 8.Which job needs a sound sensor? (a) spot someone walking in (b) switch on with a clap (c) switch on lamps at dusk (d) warn of a gas leak
9. 9.🔍 Which sensor would you use to spot someone walking in? (a) a temperature sensor (b) a motion sensor (c) a sound sensor (d) a light sensor
10. 10.Which job needs a pump? (a) show the temperature (b) turn to an exact angle (c) move water to plants (d) spin a robot’s wheels
11. 11.Which job needs a light sensor? (a) keep an incubator warm (b) switch on with a clap (c) start a fan when hot (d) switch on lamps at dusk
12. 12.🔍 Which sensor would you use to open blinds at sunrise? (a) a gas sensor (b) a rain sensor (c) a motion sensor (d) a light sensor
13. 13.Which job needs a distance sensor? (a) switch on with a clap (b) spot someone walking in (c) make a parking alarm (d) start a fan when hot
14. 14.⚙️ Which actuator would you use to beep an alarm? (a) a buzzer (b) an LED (c) a motor (d) a pump
15. 15.⚙️ Which actuator would you use to turn to an exact angle? (a) a pump (b) a servo motor (c) a motor (d) a buzzer
16. 16.Which job needs a buzzer? (a) beep an alarm (b) show a status light (c) spin a robot’s wheels (d) show the temperature
17. 17.⚙️ Which actuator would you use to spin a robot’s wheels? (a) a motor (b) a display (c) a pump (d) a buzzer
18. 18.Which job needs a servo motor? (a) beep an alarm (b) open a gate to 90° (c) move water to plants (d) show the temperature
19. 19.Which job needs a servo motor? (a) beep an alarm (b) show the temperature (c) turn to an exact angle (d) show a status light
20. 20.🔍 Which sensor would you use to start a fan when hot? (a) a rain sensor (b) a temperature sensor (c) a motion sensor (d) a distance sensor
21. 21.Which job needs a motion sensor? (a) stop a robot near walls (b) spot someone walking in (c) measure classroom noise (d) switch on with a clap
22. 22.True or false: to make a parking alarm, use a distance sensor. (a) False (b) True
23. 23.Which job needs a distance sensor? (a) open blinds at sunrise (b) spot someone walking in (c) start a fan when hot (d) stop a robot near walls
24. 24.🔍 Which sensor would you use to switch on with a clap? (a) a rain sensor (b) a sound sensor (c) a light sensor (d) a temperature sensor
25. 25.True or false: to open blinds at sunrise, use a motion sensor. (a) False (b) True
26. 26.Which job needs a soil moisture sensor? (a) stop a robot near walls (b) water a dry plant (c) make a parking alarm (d) switch on lamps at dusk
27. 27.⚙️ What is an actuator? (a) a battery (b) an output that acts (c) a program (d) a sensor
28. 28.True or false: to switch on with a clap, use a light sensor. (a) False (b) True
29. 29.True or false: to switch on with a clap, use a sound sensor. (a) False (b) True
30. 30.⚙️ Which actuator would you use to show the temperature? (a) a buzzer (b) a servo motor (c) a motor (d) a display
31. 31.True or false: to close a window in rain, use a motion sensor. (a) False (b) True
32. 32.🔍 Which sensor would you use to stop a robot near walls? (a) a gas sensor (b) a distance sensor (c) a sound sensor (d) a light sensor
33. 33.🔍 Which sensor would you use to measure classroom noise? (a) a distance sensor (b) a motion sensor (c) a sound sensor (d) a temperature sensor
34. 34.🔍 An object is 204 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
35. 35.🔍 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?
36. 36.🔍 Which sensor would you use to water a dry plant? (a) a soil moisture sensor (b) a light sensor (c) a gas sensor (d) a motion sensor
37. 37.🔍 Which sensor would you use to close a window in rain? (a) a motion sensor (b) a gas sensor (c) a rain sensor (d) a light sensor
38. 38.Which job needs a motor? (a) spin a robot’s wheels (b) move water to plants (c) show a status light (d) show the temperature
39. 39.Which job needs a display? (a) beep an alarm (b) show the temperature (c) open a gate to 90° (d) turn to an exact angle
40. 40.🔍 A distance sensor sends a sound pulse and hears the echo 7 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?

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