Electronics Worksheet: Sensors and Actuators

Electronics lesson 26: Sensors and actuators · Set 132 · 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 keep an incubator warm? (a) a temperature sensor (b) a sound sensor (c) a rain sensor (d) a light sensor
2. 2.🔍 For a microcontroller, is a sensor an input or an output? (a) an output (b) a fuse (c) an input (d) a power source
3. 3.Which job needs a sound sensor? (a) measure classroom noise (b) stop a robot near walls (c) start a fan when hot (d) warn of a gas leak
4. 4.Which job needs a rain sensor? (a) open blinds at sunrise (b) measure classroom noise (c) close a window in rain (d) start a fan when hot
5. 5.Which job needs a distance sensor? (a) start a fan when hot (b) close a window in rain (c) measure classroom noise (d) stop a robot near walls
6. 6.🔍 Which sensor would you use to warn of a gas leak? (a) a light sensor (b) a soil moisture sensor (c) a rain sensor (d) a gas sensor
7. 7.True or false: to keep an incubator warm, use a temperature sensor. (a) False (b) True
8. 8.Which job needs a distance sensor? (a) water a dry plant (b) close a window in rain (c) make a parking alarm (d) measure classroom noise
9. 9.⚙️ Which actuator would you use to open a gate to 90°? (a) a display (b) a pump (c) an LED (d) a servo motor
10. 10.⚙️ What is an actuator? (a) a sensor (b) a battery (c) a program (d) an output that acts
11. 11.True or false: to switch on with a clap, use a sound sensor. (a) False (b) True
12. 12.⚙️ Which actuator would you use to spin a robot’s wheels? (a) a servo motor (b) a display (c) an LED (d) a motor
13. 13.🔍 Which sensor would you use to switch on with a clap? (a) a rain sensor (b) a sound sensor (c) a temperature sensor (d) a light sensor
14. 14.Which job needs a pump? (a) spin a robot’s wheels (b) show a status light (c) open a gate to 90° (d) move water to plants
15. 15.🔍 Which sensor would you use to measure classroom noise? (a) a rain sensor (b) a sound sensor (c) a gas sensor (d) a distance sensor
16. 16.Which job needs a soil moisture sensor? (a) switch on lamps at dusk (b) water a dry plant (c) measure classroom noise (d) close a window in rain
17. 17.⚙️ Which actuator would you use to beep an alarm? (a) a motor (b) a servo motor (c) an LED (d) a buzzer
18. 18.True or false: to measure classroom noise, use a rain sensor. (a) True (b) False
19. 19.🔍 A distance sensor sends a sound pulse and hears the echo 14 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
20. 20.⚙️ Which actuator would you use to show a status light? (a) a motor (b) a servo motor (c) an LED (d) a pump
21. 21.Which job needs a display? (a) show the temperature (b) move water to plants (c) open a gate to 90° (d) show a status light
22. 22.Which job needs a gas sensor? (a) measure classroom noise (b) keep an incubator warm (c) stop a robot near walls (d) warn of a gas leak
23. 23.Which job needs a temperature sensor? (a) keep an incubator warm (b) make a parking alarm (c) measure classroom noise (d) warn of a gas leak
24. 24.Which job needs a motion sensor? (a) spot someone walking in (b) open blinds at sunrise (c) water a dry plant (d) measure classroom noise
25. 25.🔍 Which sensor would you use to start a fan when hot? (a) a sound sensor (b) a light sensor (c) a temperature sensor (d) a distance sensor
26. 26.Which job needs an LED? (a) show the temperature (b) beep an alarm (c) open a gate to 90° (d) show a status light
27. 27.True or false: to start a fan when hot, use a rain sensor. (a) True (b) False
28. 28.True or false: to start a fan when hot, use a temperature sensor. (a) False (b) True
29. 29.🔍 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?
30. 30.Which job needs a light sensor? (a) start a fan when hot (b) warn of a gas leak (c) measure classroom noise (d) open blinds at sunrise
31. 31.🔍 Which sensor would you use to open blinds at sunrise? (a) a motion sensor (b) a light sensor (c) a temperature sensor (d) a rain sensor
32. 32.True or false: to measure classroom noise, use a sound sensor. (a) True (b) False
33. 33.🔍 Which sensor would you use to spot someone walking in? (a) a rain sensor (b) a motion sensor (c) a soil moisture sensor (d) a sound sensor
34. 34.⚙️ Which actuator would you use to turn to an exact angle? (a) a display (b) a buzzer (c) a servo motor (d) a motor
35. 35.🔍 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?
36. 36.Which job needs a motor? (a) turn to an exact angle (b) show the temperature (c) beep an alarm (d) spin a robot’s wheels
37. 37.True or false: to open blinds at sunrise, use a rain sensor. (a) True (b) False
38. 38.True or false: to spot someone walking in, use a light sensor. (a) False (b) True
39. 39.🔍 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?
40. 40.🔍 Which sensor would you use to switch on lamps at dusk? (a) a sound sensor (b) a motion sensor (c) a gas sensor (d) a light sensor

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