Electronics Worksheet: Sensors and Actuators

Electronics lesson 26: Sensors and actuators · Set 329 · 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 temperature sensor? (a) close a window in rain (b) start a fan when hot (c) stop a robot near walls (d) switch on with a clap
2. 2.🔍 For a microcontroller, is a sensor an input or an output? (a) an input (b) a power source (c) an output (d) a fuse
3. 3.Which job needs a buzzer? (a) show a status light (b) show the temperature (c) spin a robot’s wheels (d) beep an alarm
4. 4.🔍 Which sensor would you use to warn of a gas leak? (a) a soil moisture sensor (b) a gas sensor (c) a motion sensor (d) a temperature sensor
5. 5.Which job needs a servo motor? (a) beep an alarm (b) move water to plants (c) turn to an exact angle (d) show a status light
6. 6.True or false: to open blinds at sunrise, use a distance sensor. (a) False (b) True
7. 7.🔍 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?
8. 8.True or false: to water a dry plant, use a soil moisture sensor. (a) False (b) True
9. 9.🔍 Which sensor would you use to open blinds at sunrise? (a) a temperature sensor (b) a sound sensor (c) a gas sensor (d) a light sensor
10. 10.True or false: to measure classroom noise, use a soil moisture sensor. (a) True (b) False
11. 11.🔍 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)?
12. 12.🔍 Which sensor would you use to stop a robot near walls? (a) a sound sensor (b) a distance sensor (c) a light sensor (d) a soil moisture sensor
13. 13.True or false: to open blinds at sunrise, use a light sensor. (a) True (b) False
14. 14.⚙️ What is an actuator? (a) a battery (b) a sensor (c) an output that acts (d) a program
15. 15.Which job needs a gas sensor? (a) warn of a gas leak (b) keep an incubator warm (c) stop a robot near walls (d) close a window in rain
16. 16.Which job needs a pump? (a) show the temperature (b) move water to plants (c) open a gate to 90° (d) show a status light
17. 17.⚙️ Which actuator would you use to open a gate to 90°? (a) an LED (b) a servo motor (c) a display (d) a motor
18. 18.Which job needs a distance sensor? (a) start a fan when hot (b) switch on lamps at dusk (c) water a dry plant (d) make a parking alarm
19. 19.🔍 Which sensor would you use to switch on with a clap? (a) a sound sensor (b) a light sensor (c) a temperature sensor (d) a distance sensor
20. 20.🔍 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)?
21. 21.🔍 Which sensor would you use to spot someone walking in? (a) a light sensor (b) a soil moisture sensor (c) a rain sensor (d) a motion sensor
22. 22.🔍 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)?
23. 23.⚙️ Which actuator would you use to spin a robot’s wheels? (a) a display (b) a motor (c) an LED (d) a servo motor
24. 24.🔍 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)?
25. 25.🔍 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?
26. 26.Which job needs a light sensor? (a) stop a robot near walls (b) warn of a gas leak (c) switch on lamps at dusk (d) switch on with a clap
27. 27.🔍 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)?
28. 28.Which job needs a display? (a) turn to an exact angle (b) beep an alarm (c) show the temperature (d) open a gate to 90°
29. 29.Which job needs a motor? (a) turn to an exact angle (b) beep an alarm (c) spin a robot’s wheels (d) open a gate to 90°
30. 30.🔍 Which sensor would you use to switch on lamps at dusk? (a) a soil moisture sensor (b) a light sensor (c) a rain sensor (d) a temperature sensor
31. 31.⚙️ Which actuator would you use to turn to an exact angle? (a) a buzzer (b) a display (c) a motor (d) a servo motor
32. 32.True or false: to make a parking alarm, use a distance sensor. (a) False (b) True
33. 33.⚙️ Which actuator would you use to move water to plants? (a) a motor (b) a display (c) an LED (d) a pump
34. 34.⚙️ Which actuator would you use to beep an alarm? (a) a pump (b) a servo motor (c) a display (d) a buzzer
35. 35.🔍 Which sensor would you use to water a dry plant? (a) a soil moisture sensor (b) a sound sensor (c) a temperature sensor (d) a motion sensor
36. 36.Which job needs a soil moisture sensor? (a) start a fan when hot (b) spot someone walking in (c) open blinds at sunrise (d) water a dry plant
37. 37.⚙️ Which actuator would you use to show the temperature? (a) a servo motor (b) a motor (c) a display (d) a buzzer
38. 38.True or false: to open blinds at sunrise, use a soil moisture sensor. (a) False (b) True
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 distance sensor? (a) keep an incubator warm (b) stop a robot near walls (c) water a dry plant (d) close a window in rain

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