Electronics Worksheet: Sensors and Actuators

Electronics lesson 26: Sensors and actuators · Set 229 · 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 sensor would you use to measure classroom noise? (a) a rain sensor (b) a sound sensor (c) a distance sensor (d) a light sensor
2. 2.🔍 A distance sensor sends a sound pulse and hears the echo 8 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
3. 3.Which job needs a pump? (a) beep an alarm (b) move water to plants (c) open a gate to 90° (d) turn to an exact angle
4. 4.⚙️ Which actuator would you use to show a status light? (a) a motor (b) a servo motor (c) an LED (d) a pump
5. 5.⚙️ What is an actuator? (a) an output that acts (b) a battery (c) a sensor (d) a program
6. 6.Which job needs a buzzer? (a) turn to an exact angle (b) move water to plants (c) beep an alarm (d) open a gate to 90°
7. 7.True or false: to start a fan when hot, use a light sensor. (a) False (b) True
8. 8.⚙️ Which actuator would you use to open a gate to 90°? (a) a motor (b) a servo motor (c) a display (d) an LED
9. 9.⚙️ Which actuator would you use to turn to an exact angle? (a) a motor (b) a buzzer (c) a display (d) a servo motor
10. 10.🔍 Which sensor would you use to spot someone walking in? (a) a rain sensor (b) a temperature sensor (c) a light sensor (d) a motion sensor
11. 11.True or false: to warn of a gas leak, use a rain sensor. (a) True (b) False
12. 12.Which job needs a gas sensor? (a) start a fan when hot (b) close a window in rain (c) switch on lamps at dusk (d) warn of a gas leak
13. 13.Which job needs a light sensor? (a) warn of a gas leak (b) switch on lamps at dusk (c) measure classroom noise (d) close a window in rain
14. 14.🔍 An object is 306 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
15. 15.🔍 For a microcontroller, is a sensor an input or an output? (a) a power source (b) a fuse (c) an output (d) an input
16. 16.🔍 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)?
17. 17.🔍 Which sensor would you use to water a dry plant? (a) a rain sensor (b) a light sensor (c) a soil moisture sensor (d) a temperature sensor
18. 18.True or false: to measure classroom noise, use a sound sensor. (a) False (b) True
19. 19.True or false: to spot someone walking in, use a soil moisture sensor. (a) True (b) False
20. 20.True or false: to spot someone walking in, use a gas sensor. (a) True (b) False
21. 21.🔍 Which sensor would you use to keep an incubator warm? (a) a temperature sensor (b) a gas sensor (c) a rain sensor (d) a light sensor
22. 22.Which job needs a distance sensor? (a) water a dry plant (b) measure classroom noise (c) spot someone walking in (d) make a parking alarm
23. 23.True or false: to water a dry plant, use a light sensor. (a) False (b) True
24. 24.Which job needs a soil moisture sensor? (a) warn of a gas leak (b) keep an incubator warm (c) water a dry plant (d) switch on with a clap
25. 25.True or false: to switch on lamps at dusk, use a soil moisture sensor. (a) False (b) True
26. 26.⚙️ Which actuator would you use to spin a robot’s wheels? (a) a motor (b) an LED (c) a servo motor (d) a display
27. 27.🔍 Which sensor would you use to open blinds at sunrise? (a) a gas sensor (b) a distance sensor (c) a rain sensor (d) a light sensor
28. 28.Which job needs a sound sensor? (a) measure classroom noise (b) make a parking alarm (c) switch on lamps at dusk (d) open blinds at sunrise
29. 29.True or false: to water a dry plant, use a soil moisture sensor. (a) True (b) False
30. 30.Which job needs a distance sensor? (a) close a window in rain (b) open blinds at sunrise (c) keep an incubator warm (d) stop a robot near walls
31. 31.🔍 An object is 255 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 motion sensor? (a) spot someone walking in (b) switch on lamps at dusk (c) close a window in rain (d) keep an incubator warm
33. 33.🔍 Which sensor would you use to switch on with a clap? (a) a soil moisture sensor (b) a rain sensor (c) a light sensor (d) a sound sensor
34. 34.Which job needs a light sensor? (a) close a window in rain (b) switch on with a clap (c) open blinds at sunrise (d) water a dry plant
35. 35.True or false: to keep an incubator warm, use a temperature sensor. (a) True (b) False
36. 36.True or false: to spot someone walking in, use a motion sensor. (a) True (b) False
37. 37.True or false: to start a fan when hot, use a gas sensor. (a) True (b) False
38. 38.🔍 An object is 238 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
39. 39.🔍 A distance sensor sends a sound pulse and hears the echo 17 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
40. 40.Which job needs a rain sensor? (a) measure classroom noise (b) make a parking alarm (c) warn of a gas leak (d) close a window in rain

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