Electronics Worksheet: Sensors and Actuators

Electronics lesson 26: Sensors and actuators · Set 150 · 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) an LED (b) a pump (c) a motor (d) a servo motor
2. 2.⚙️ Which actuator would you use to open a gate to 90°? (a) a servo motor (b) an LED (c) a display (d) a pump
3. 3.Which job needs an LED? (a) turn to an exact angle (b) beep an alarm (c) spin a robot’s wheels (d) show a status light
4. 4.Which job needs a temperature sensor? (a) switch on lamps at dusk (b) make a parking alarm (c) stop a robot near walls (d) start a fan when hot
5. 5.🔍 For a microcontroller, is a sensor an input or an output? (a) a power source (b) a fuse (c) an input (d) an output
6. 6.🔍 A distance sensor sends a sound pulse and hears the echo 2 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
7. 7.🔍 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)?
8. 8.Which job needs a sound sensor? (a) spot someone walking in (b) make a parking alarm (c) measure classroom noise (d) stop a robot near walls
9. 9.True or false: to open blinds at sunrise, use a light sensor. (a) False (b) True
10. 10.True or false: to keep an incubator warm, use a temperature sensor. (a) True (b) False
11. 11.Which job needs a sound sensor? (a) warn of a gas leak (b) spot someone walking in (c) switch on with a clap (d) switch on lamps at dusk
12. 12.Which job needs a pump? (a) turn to an exact angle (b) show the temperature (c) move water to plants (d) spin a robot’s wheels
13. 13.Which job needs a buzzer? (a) move water to plants (b) spin a robot’s wheels (c) beep an alarm (d) show a status light
14. 14.Which job needs a light sensor? (a) warn of a gas leak (b) switch on with a clap (c) switch on lamps at dusk (d) close a window in rain
15. 15.🔍 An object is 323 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
16. 16.🔍 Which sensor would you use to open blinds at sunrise? (a) a temperature sensor (b) a light sensor (c) a motion sensor (d) a rain sensor
17. 17.True or false: to switch on lamps at dusk, use a light sensor. (a) True (b) False
18. 18.True or false: to stop a robot near walls, use a distance sensor. (a) False (b) True
19. 19.True or false: to start a fan when hot, use a temperature sensor. (a) True (b) False
20. 20.⚙️ What is an actuator? (a) a battery (b) a program (c) an output that acts (d) a sensor
21. 21.🔍 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?
22. 22.⚙️ Which actuator would you use to show the temperature? (a) a pump (b) a buzzer (c) a motor (d) a display
23. 23.🔍 Which sensor would you use to keep an incubator warm? (a) a rain sensor (b) a temperature sensor (c) a motion sensor (d) a sound sensor
24. 24.Which job needs a display? (a) spin a robot’s wheels (b) show the temperature (c) beep an alarm (d) move water to plants
25. 25.Which job needs a light sensor? (a) stop a robot near walls (b) measure classroom noise (c) switch on with a clap (d) open blinds at sunrise
26. 26.True or false: to make a parking alarm, use a sound sensor. (a) True (b) False
27. 27.🔍 Which sensor would you use to start a fan when hot? (a) a soil moisture sensor (b) a temperature sensor (c) a light sensor (d) a rain sensor
28. 28.⚙️ Which actuator would you use to beep an alarm? (a) a servo motor (b) a display (c) a pump (d) a buzzer
29. 29.True or false: to water a dry plant, use a soil moisture sensor. (a) False (b) True
30. 30.True or false: to close a window in rain, use a rain sensor. (a) True (b) False
31. 31.Which job needs a servo motor? (a) show the temperature (b) show a status light (c) turn to an exact angle (d) spin a robot’s wheels
32. 32.🔍 Which sensor would you use to switch on with a clap? (a) a soil moisture sensor (b) a motion sensor (c) a sound sensor (d) a gas sensor
33. 33.Which job needs a motion sensor? (a) start a fan when hot (b) spot someone walking in (c) warn of a gas leak (d) switch on lamps at dusk
34. 34.🔍 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)?
35. 35.True or false: to warn of a gas leak, use a gas sensor. (a) True (b) False
36. 36.True or false: to warn of a gas leak, use a temperature sensor. (a) True (b) False
37. 37.Which job needs a gas sensor? (a) spot someone walking in (b) water a dry plant (c) start a fan when hot (d) warn of a gas leak
38. 38.⚙️ Which actuator would you use to show a status light? (a) a display (b) a pump (c) a motor (d) an LED
39. 39.🔍 An object is 170 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 measure classroom noise, use a sound sensor. (a) True (b) False

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