Electronics Worksheet: Sensors and Actuators

Electronics lesson 26: Sensors and actuators · Set 337 · 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 a motion sensor? (a) switch on with a clap (b) warn of a gas leak (c) spot someone walking in (d) make a parking alarm
2. 2.Which job needs an LED? (a) turn to an exact angle (b) open a gate to 90° (c) show the temperature (d) show a status light
3. 3.⚙️ Which actuator would you use to show a status light? (a) a servo motor (b) an LED (c) a display (d) a pump
4. 4.⚙️ Which actuator would you use to turn to an exact angle? (a) a servo motor (b) a pump (c) a motor (d) a display
5. 5.Which job needs a buzzer? (a) show a status light (b) move water to plants (c) beep an alarm (d) turn to an exact angle
6. 6.⚙️ Which actuator would you use to beep an alarm? (a) a buzzer (b) a motor (c) a servo motor (d) a pump
7. 7.⚙️ Which actuator would you use to show the temperature? (a) a pump (b) a motor (c) a display (d) a buzzer
8. 8.Which job needs a temperature sensor? (a) water a dry plant (b) open blinds at sunrise (c) stop a robot near walls (d) start a fan when hot
9. 9.True or false: to start a fan when hot, use a motion sensor. (a) True (b) False
10. 10.⚙️ Which actuator would you use to spin a robot’s wheels? (a) a servo motor (b) a motor (c) a buzzer (d) a display
11. 11.True or false: to start a fan when hot, use a temperature sensor. (a) False (b) True
12. 12.⚙️ Which actuator would you use to open a gate to 90°? (a) a servo motor (b) a motor (c) a pump (d) a buzzer
13. 13.🔍 For a microcontroller, is a sensor an input or an output? (a) an input (b) a fuse (c) an output (d) a power source
14. 14.🔍 Which sensor would you use to open blinds at sunrise? (a) a motion sensor (b) a light sensor (c) a soil moisture sensor (d) a distance sensor
15. 15.True or false: to keep an incubator warm, use a distance sensor. (a) False (b) True
16. 16.⚙️ What is an actuator? (a) a program (b) a battery (c) a sensor (d) an output that acts
17. 17.Which job needs a distance sensor? (a) switch on with a clap (b) switch on lamps at dusk (c) warn of a gas leak (d) make a parking alarm
18. 18.🔍 Which sensor would you use to spot someone walking in? (a) a rain sensor (b) a motion sensor (c) a light sensor (d) a soil moisture sensor
19. 19.Which job needs a soil moisture sensor? (a) switch on lamps at dusk (b) switch on with a clap (c) stop a robot near walls (d) water a dry plant
20. 20.Which job needs a light sensor? (a) measure classroom noise (b) close a window in rain (c) switch on with a clap (d) switch on lamps at dusk
21. 21.🔍 Which sensor would you use to measure classroom noise? (a) a soil moisture sensor (b) a sound sensor (c) a distance sensor (d) a gas sensor
22. 22.🔍 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?
23. 23.🔍 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)?
24. 24.⚙️ Which actuator would you use to move water to plants? (a) a buzzer (b) a display (c) a servo motor (d) a pump
25. 25.Which job needs a sound sensor? (a) switch on lamps at dusk (b) switch on with a clap (c) warn of a gas leak (d) stop a robot near walls
26. 26.🔍 A distance sensor sends a sound pulse and hears the echo 10 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
27. 27.🔍 Which sensor would you use to close a window in rain? (a) a rain sensor (b) a light sensor (c) a gas sensor (d) a temperature sensor
28. 28.🔍 Which sensor would you use to stop a robot near walls? (a) a distance sensor (b) a motion sensor (c) a soil moisture sensor (d) a sound sensor
29. 29.True or false: to spot someone walking in, use a motion sensor. (a) True (b) False
30. 30.True or false: to spot someone walking in, use a sound sensor. (a) False (b) True
31. 31.🔍 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)?
32. 32.Which job needs a rain sensor? (a) warn of a gas leak (b) switch on with a clap (c) close a window in rain (d) water a dry plant
33. 33.🔍 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?
34. 34.🔍 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)?
35. 35.🔍 Which sensor would you use to keep an incubator warm? (a) a temperature sensor (b) a sound sensor (c) a motion sensor (d) a soil moisture sensor
36. 36.Which job needs a servo motor? (a) show a status light (b) move water to plants (c) open a gate to 90° (d) show the temperature
37. 37.True or false: to keep an incubator warm, use a temperature sensor. (a) False (b) True
38. 38.🔍 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)?
39. 39.True or false: to switch on with a clap, use a sound sensor. (a) False (b) True
40. 40.Which job needs a pump? (a) move water to plants (b) open a gate to 90° (c) spin a robot’s wheels (d) turn to an exact angle

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