Electronics Worksheet: Sensors and Actuators

Electronics lesson 26: Sensors and actuators · Set 338 · 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.True or false: to spot someone walking in, use a sound sensor. (a) False (b) True
2. 2.Which job needs a sound sensor? (a) make a parking alarm (b) switch on lamps at dusk (c) switch on with a clap (d) open blinds at sunrise
3. 3.Which job needs a rain sensor? (a) warn of a gas leak (b) measure classroom noise (c) close a window in rain (d) switch on with a clap
4. 4.🔍 Which sensor would you use to open blinds at sunrise? (a) a distance sensor (b) a light sensor (c) a gas sensor (d) a sound sensor
5. 5.🔍 For a microcontroller, is a sensor an input or an output? (a) a fuse (b) a power source (c) an input (d) an output
6. 6.True or false: to close a window in rain, use a rain sensor. (a) False (b) True
7. 7.🔍 Which sensor would you use to measure classroom noise? (a) a light sensor (b) a distance sensor (c) a soil moisture sensor (d) a sound sensor
8. 8.⚙️ Which actuator would you use to show the temperature? (a) a pump (b) a servo motor (c) a buzzer (d) a display
9. 9.Which job needs a motor? (a) spin a robot’s wheels (b) show a status light (c) beep an alarm (d) turn to an exact angle
10. 10.Which job needs an LED? (a) show the temperature (b) open a gate to 90° (c) show a status light (d) beep an alarm
11. 11.True or false: to measure classroom noise, use a sound sensor. (a) False (b) True
12. 12.True or false: to measure classroom noise, use a rain sensor. (a) True (b) False
13. 13.🔍 Which sensor would you use to stop a robot near walls? (a) a temperature sensor (b) a sound sensor (c) a distance sensor (d) a rain sensor
14. 14.Which job needs a buzzer? (a) move water to plants (b) beep an alarm (c) turn to an exact angle (d) show the temperature
15. 15.🔍 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)?
16. 16.🔍 Which sensor would you use to spot someone walking in? (a) a rain sensor (b) a soil moisture sensor (c) a motion sensor (d) a light sensor
17. 17.True or false: to spot someone walking in, use a motion sensor. (a) True (b) False
18. 18.🔍 Which sensor would you use to warn of a gas leak? (a) a gas sensor (b) a temperature sensor (c) a light sensor (d) a distance sensor
19. 19.⚙️ What is an actuator? (a) a battery (b) a program (c) an output that acts (d) a sensor
20. 20.🔍 Which sensor would you use to water a dry plant? (a) a gas sensor (b) a light sensor (c) a soil moisture sensor (d) a sound sensor
21. 21.⚙️ Which actuator would you use to show a status light? (a) a motor (b) an LED (c) a servo motor (d) a display
22. 22.True or false: to measure classroom noise, use a light sensor. (a) False (b) True
23. 23.True or false: to switch on lamps at dusk, use a light sensor. (a) True (b) False
24. 24.🔍 An object is 221 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
25. 25.🔍 Which sensor would you use to make a parking alarm? (a) a temperature sensor (b) a gas sensor (c) a light sensor (d) a distance sensor
26. 26.Which job needs a display? (a) beep an alarm (b) turn to an exact angle (c) show the temperature (d) show a status light
27. 27.Which job needs a motion sensor? (a) switch on lamps at dusk (b) water a dry plant (c) spot someone walking in (d) close a window in rain
28. 28.⚙️ Which actuator would you use to turn to an exact angle? (a) a servo motor (b) a display (c) an LED (d) a motor
29. 29.True or false: to make a parking alarm, use a gas sensor. (a) True (b) False
30. 30.Which job needs a servo motor? (a) spin a robot’s wheels (b) beep an alarm (c) show a status light (d) open a gate to 90°
31. 31.🔍 An object is 119 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
32. 32.🔍 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?
33. 33.Which job needs a servo motor? (a) spin a robot’s wheels (b) beep an alarm (c) turn to an exact angle (d) show the temperature
34. 34.True or false: to open blinds at sunrise, use a soil moisture sensor. (a) False (b) True
35. 35.🔍 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)?
36. 36.True or false: to switch on with a clap, use a light sensor. (a) False (b) True
37. 37.Which job needs a temperature sensor? (a) keep an incubator warm (b) make a parking alarm (c) switch on lamps at dusk (d) spot someone walking in
38. 38.🔍 Which sensor would you use to switch on lamps at dusk? (a) a sound sensor (b) a rain sensor (c) a gas sensor (d) a light sensor
39. 39.Which job needs a sound sensor? (a) spot someone walking in (b) open blinds at sunrise (c) measure classroom noise (d) stop a robot near walls
40. 40.🔍 A distance sensor sends a sound pulse and hears the echo 19 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?

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