Electronics Worksheet: Sensors and Actuators

Electronics lesson 26: Sensors and actuators · Set 46 · 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 water a dry plant? (a) a sound sensor (b) a soil moisture sensor (c) a gas sensor (d) a distance sensor
2. 2.🔍 For a microcontroller, is a sensor an input or an output? (a) a fuse (b) a power source (c) an output (d) an input
3. 3.Which job needs a gas sensor? (a) spot someone walking in (b) stop a robot near walls (c) warn of a gas leak (d) open blinds at sunrise
4. 4.⚙️ Which actuator would you use to show the temperature? (a) a pump (b) an LED (c) a motor (d) a display
5. 5.⚙️ Which actuator would you use to spin a robot’s wheels? (a) a servo motor (b) a buzzer (c) a motor (d) an LED
6. 6.Which job needs a temperature sensor? (a) spot someone walking in (b) open blinds at sunrise (c) warn of a gas leak (d) start a fan when hot
7. 7.⚙️ Which actuator would you use to beep an alarm? (a) a servo motor (b) an LED (c) a motor (d) a buzzer
8. 8.🔍 Which sensor would you use to warn of a gas leak? (a) a rain sensor (b) a temperature sensor (c) a gas sensor (d) a motion sensor
9. 9.⚙️ What is an actuator? (a) an output that acts (b) a sensor (c) a battery (d) a program
10. 10.True or false: to open blinds at sunrise, use a temperature sensor. (a) True (b) False
11. 11.Which job needs a motor? (a) turn to an exact angle (b) show the temperature (c) spin a robot’s wheels (d) open a gate to 90°
12. 12.🔍 Which sensor would you use to open blinds at sunrise? (a) a distance sensor (b) a light sensor (c) a sound sensor (d) a temperature sensor
13. 13.🔍 Which sensor would you use to make a parking alarm? (a) a rain sensor (b) a motion sensor (c) a temperature sensor (d) a distance sensor
14. 14.🔍 Which sensor would you use to stop a robot near walls? (a) a light sensor (b) a sound sensor (c) a distance sensor (d) a motion sensor
15. 15.True or false: to water a dry plant, use a distance sensor. (a) False (b) True
16. 16.Which job needs a sound sensor? (a) keep an incubator warm (b) switch on with a clap (c) close a window in rain (d) switch on lamps at dusk
17. 17.True or false: to start a fan when hot, use a motion sensor. (a) True (b) False
18. 18.True or false: to warn of a gas leak, use a gas sensor. (a) True (b) False
19. 19.🔍 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?
20. 20.Which job needs a servo motor? (a) open a gate to 90° (b) beep an alarm (c) spin a robot’s wheels (d) move water to plants
21. 21.True or false: to keep an incubator warm, use a soil moisture sensor. (a) True (b) False
22. 22.⚙️ Which actuator would you use to turn to an exact angle? (a) a buzzer (b) an LED (c) a motor (d) a servo motor
23. 23.🔍 A distance sensor sends a sound pulse and hears the echo 10 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
24. 24.🔍 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)?
25. 25.Which job needs a light sensor? (a) water a dry plant (b) close a window in rain (c) open blinds at sunrise (d) start a fan when hot
26. 26.Which job needs a display? (a) show the temperature (b) beep an alarm (c) move water to plants (d) spin a robot’s wheels
27. 27.🔍 Which sensor would you use to close a window in rain? (a) a rain sensor (b) a temperature sensor (c) a sound sensor (d) a gas sensor
28. 28.Which job needs a pump? (a) spin a robot’s wheels (b) beep an alarm (c) show the temperature (d) move water to plants
29. 29.🔍 Which sensor would you use to start a fan when hot? (a) a rain sensor (b) a motion sensor (c) a light sensor (d) a temperature sensor
30. 30.True or false: to warn of a gas leak, use a distance sensor. (a) True (b) False
31. 31.True or false: to start a fan when hot, use a light sensor. (a) True (b) False
32. 32.🔍 An object is 34 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 soil moisture sensor? (a) switch on lamps at dusk (b) water a dry plant (c) keep an incubator warm (d) make a parking alarm
34. 34.🔍 Which sensor would you use to measure classroom noise? (a) a soil moisture sensor (b) a temperature sensor (c) a rain sensor (d) a sound sensor
35. 35.Which job needs an LED? (a) show a status light (b) beep an alarm (c) turn to an exact angle (d) show the temperature
36. 36.🔍 Which sensor would you use to keep an incubator warm? (a) a temperature sensor (b) a sound sensor (c) a motion sensor (d) a rain sensor
37. 37.🔍 Which sensor would you use to spot someone walking in? (a) a rain sensor (b) a gas sensor (c) a light sensor (d) a motion sensor
38. 38.🔍 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)?
39. 39.True or false: to spot someone walking in, use a temperature sensor. (a) True (b) False
40. 40.True or false: to spot someone walking in, use a motion sensor. (a) True (b) False

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