Electronics Worksheet: Sensors and Actuators

Electronics lesson 26: Sensors and actuators · Set 154 · 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 actuator would you use to show a status light? (a) an LED (b) a motor (c) a servo motor (d) a display
2. 2.🔍 Which sensor would you use to close a window in rain? (a) a temperature sensor (b) a distance sensor (c) a rain sensor (d) a light sensor
3. 3.🔍 For a microcontroller, is a sensor an input or an output? (a) a fuse (b) a power source (c) an input (d) an output
4. 4.Which job needs a motor? (a) spin a robot’s wheels (b) show the temperature (c) turn to an exact angle (d) show a status light
5. 5.True or false: to water a dry plant, use a soil moisture sensor. (a) False (b) True
6. 6.Which job needs a pump? (a) move water to plants (b) spin a robot’s wheels (c) show the temperature (d) open a gate to 90°
7. 7.🔍 Which sensor would you use to measure classroom noise? (a) a motion sensor (b) a soil moisture sensor (c) a distance sensor (d) a sound sensor
8. 8.True or false: to open blinds at sunrise, use a sound sensor. (a) True (b) False
9. 9.🔍 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?
10. 10.⚙️ Which actuator would you use to turn to an exact angle? (a) a servo motor (b) a pump (c) an LED (d) a buzzer
11. 11.Which job needs a temperature sensor? (a) switch on lamps at dusk (b) measure classroom noise (c) spot someone walking in (d) keep an incubator warm
12. 12.⚙️ Which actuator would you use to show the temperature? (a) a pump (b) a motor (c) an LED (d) a display
13. 13.🔍 Which sensor would you use to warn of a gas leak? (a) a sound sensor (b) a temperature sensor (c) a light sensor (d) a gas sensor
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 display? (a) move water to plants (b) open a gate to 90° (c) show the temperature (d) turn to an exact angle
16. 16.🔍 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?
17. 17.Which job needs a distance sensor? (a) switch on lamps at dusk (b) water a dry plant (c) stop a robot near walls (d) warn of a gas leak
18. 18.🔍 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)?
19. 19.Which job needs a rain sensor? (a) stop a robot near walls (b) switch on lamps at dusk (c) water a dry plant (d) close a window in rain
20. 20.🔍 Which sensor would you use to open blinds at sunrise? (a) a distance sensor (b) a gas sensor (c) a motion sensor (d) a light sensor
21. 21.True or false: to start a fan when hot, use a distance sensor. (a) True (b) False
22. 22.🔍 Which sensor would you use to switch on lamps at dusk? (a) a distance sensor (b) a gas sensor (c) a light sensor (d) a sound sensor
23. 23.Which job needs a buzzer? (a) show the temperature (b) turn to an exact angle (c) show a status light (d) beep an alarm
24. 24.🔍 Which sensor would you use to keep an incubator warm? (a) a gas sensor (b) a light sensor (c) a distance sensor (d) a temperature sensor
25. 25.🔍 Which sensor would you use to spot someone walking in? (a) a light sensor (b) a soil moisture sensor (c) a temperature sensor (d) a motion sensor
26. 26.Which job needs a light sensor? (a) water a dry plant (b) make a parking alarm (c) start a fan when hot (d) switch on lamps at dusk
27. 27.True or false: to switch on lamps at dusk, use a distance sensor. (a) False (b) True
28. 28.True or false: to stop a robot near walls, use a distance sensor. (a) True (b) False
29. 29.⚙️ Which actuator would you use to move water to plants? (a) a pump (b) a motor (c) a display (d) a servo motor
30. 30.🔍 A distance sensor sends a sound pulse and hears the echo 20 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
31. 31.True or false: to measure classroom noise, use a soil moisture sensor. (a) True (b) False
32. 32.🔍 A distance sensor sends a sound pulse and hears the echo 9 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
33. 33.🔍 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)?
34. 34.🔍 Which sensor would you use to make a parking alarm? (a) a rain sensor (b) a distance sensor (c) a temperature sensor (d) a motion sensor
35. 35.⚙️ Which actuator would you use to beep an alarm? (a) a buzzer (b) a display (c) a servo motor (d) a motor
36. 36.True or false: to make a parking alarm, use a distance sensor. (a) True (b) False
37. 37.🔍 Which sensor would you use to water a dry plant? (a) a distance sensor (b) a soil moisture sensor (c) a light sensor (d) a motion sensor
38. 38.True or false: to warn of a gas leak, use a light sensor. (a) True (b) False
39. 39.🔍 A distance sensor sends a sound pulse and hears the echo 1 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
40. 40.🔍 Which sensor would you use to start a fan when hot? (a) a distance sensor (b) a sound sensor (c) a soil moisture sensor (d) a temperature sensor

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