Electronics Worksheet: Sensors and Actuators

Electronics lesson 26: Sensors and actuators · Set 197 · 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 open blinds at sunrise? (a) a motion sensor (b) a temperature sensor (c) a light sensor (d) a soil moisture sensor
2. 2.🔍 Which sensor would you use to switch on lamps at dusk? (a) a sound sensor (b) a motion sensor (c) a light sensor (d) a rain sensor
3. 3.⚙️ Which actuator would you use to spin a robot’s wheels? (a) a motor (b) a display (c) a pump (d) a servo motor
4. 4.Which job needs a motor? (a) open a gate to 90° (b) spin a robot’s wheels (c) show a status light (d) show the temperature
5. 5.Which job needs a motion sensor? (a) spot someone walking in (b) stop a robot near walls (c) water a dry plant (d) keep an incubator warm
6. 6.🔍 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?
7. 7.🔍 Which sensor would you use to water a dry plant? (a) a sound sensor (b) a soil moisture sensor (c) a light sensor (d) a temperature sensor
8. 8.True or false: to spot someone walking in, use a sound sensor. (a) False (b) True
9. 9.Which job needs a pump? (a) beep an alarm (b) move water to plants (c) show a status light (d) turn to an exact angle
10. 10.🔍 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?
11. 11.⚙️ What is an actuator? (a) an output that acts (b) a program (c) a sensor (d) a battery
12. 12.Which job needs a servo motor? (a) beep an alarm (b) show a status light (c) show the temperature (d) turn to an exact angle
13. 13.🔍 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?
14. 14.🔍 For a microcontroller, is a sensor an input or an output? (a) an input (b) a fuse (c) a power source (d) an output
15. 15.⚙️ Which actuator would you use to turn to an exact angle? (a) a servo motor (b) a pump (c) a buzzer (d) a display
16. 16.⚙️ Which actuator would you use to show the temperature? (a) an LED (b) a display (c) a pump (d) a servo motor
17. 17.🔍 A distance sensor sends a sound pulse and hears the echo 13 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
18. 18.⚙️ Which actuator would you use to show a status light? (a) a buzzer (b) a display (c) an LED (d) a motor
19. 19.True or false: to switch on lamps at dusk, use a sound sensor. (a) True (b) False
20. 20.Which job needs a rain sensor? (a) switch on lamps at dusk (b) switch on with a clap (c) warn of a gas leak (d) close a window in rain
21. 21.True or false: to spot someone walking in, use a motion sensor. (a) False (b) True
22. 22.Which job needs a soil moisture sensor? (a) start a fan when hot (b) water a dry plant (c) open blinds at sunrise (d) stop a robot near walls
23. 23.True or false: to measure classroom noise, use a sound sensor. (a) False (b) True
24. 24.True or false: to warn of a gas leak, use a soil moisture sensor. (a) True (b) False
25. 25.Which job needs a display? (a) show a status light (b) spin a robot’s wheels (c) beep an alarm (d) show the temperature
26. 26.🔍 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)?
27. 27.True or false: to make a parking alarm, use a sound sensor. (a) True (b) False
28. 28.🔍 Which sensor would you use to measure classroom noise? (a) a gas sensor (b) a temperature sensor (c) a sound sensor (d) a soil moisture sensor
29. 29.Which job needs a temperature sensor? (a) warn of a gas leak (b) switch on lamps at dusk (c) open blinds at sunrise (d) keep an incubator warm
30. 30.🔍 A distance sensor sends a sound pulse and hears the echo 11 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
31. 31.🔍 A distance sensor sends a sound pulse and hears the echo 18 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
32. 32.True or false: to switch on with a clap, use a motion sensor. (a) True (b) False
33. 33.🔍 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)?
34. 34.True or false: to start a fan when hot, use a temperature sensor. (a) False (b) True
35. 35.🔍 Which sensor would you use to close a window in rain? (a) a temperature sensor (b) a rain sensor (c) a distance sensor (d) a soil moisture sensor
36. 36.🔍 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?
37. 37.Which job needs an LED? (a) beep an alarm (b) move water to plants (c) spin a robot’s wheels (d) show a status light
38. 38.🔍 A distance sensor sends a sound pulse and hears the echo 12 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
39. 39.🔍 A distance sensor sends a sound pulse and hears the echo 6 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
40. 40.🔍 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?

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