Electronics Worksheet: Sensors and Actuators

Electronics lesson 26: Sensors and actuators · Set 88 · 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.🔍 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)?
2. 2.🔍 Which sensor would you use to spot someone walking in? (a) a distance sensor (b) a light sensor (c) a motion sensor (d) a rain sensor
3. 3.⚙️ Which actuator would you use to turn to an exact angle? (a) a pump (b) an LED (c) a servo motor (d) a buzzer
4. 4.🔍 For a microcontroller, is a sensor an input or an output? (a) a fuse (b) an input (c) a power source (d) an output
5. 5.⚙️ What is an actuator? (a) a program (b) a battery (c) a sensor (d) an output that acts
6. 6.🔍 Which sensor would you use to switch on lamps at dusk? (a) a distance sensor (b) a temperature sensor (c) a light sensor (d) a gas sensor
7. 7.Which job needs a distance sensor? (a) switch on lamps at dusk (b) make a parking alarm (c) keep an incubator warm (d) close a window in rain
8. 8.True or false: to open blinds at sunrise, use a motion sensor. (a) True (b) False
9. 9.🔍 Which sensor would you use to start a fan when hot? (a) a light sensor (b) a sound sensor (c) a temperature sensor (d) a motion sensor
10. 10.⚙️ Which actuator would you use to show a status light? (a) a pump (b) an LED (c) a motor (d) a servo motor
11. 11.Which job needs a pump? (a) move water to plants (b) spin a robot’s wheels (c) beep an alarm (d) open a gate to 90°
12. 12.Which job needs a motor? (a) move water to plants (b) spin a robot’s wheels (c) open a gate to 90° (d) beep an alarm
13. 13.True or false: to spot someone walking in, use a motion sensor. (a) False (b) True
14. 14.True or false: to keep an incubator warm, use a temperature sensor. (a) False (b) True
15. 15.⚙️ Which actuator would you use to beep an alarm? (a) a buzzer (b) an LED (c) a display (d) a pump
16. 16.🔍 Which sensor would you use to switch on with a clap? (a) a motion sensor (b) a sound sensor (c) a soil moisture sensor (d) a gas sensor
17. 17.True or false: to switch on lamps at dusk, use a light sensor. (a) True (b) False
18. 18.Which job needs a gas sensor? (a) open blinds at sunrise (b) warn of a gas leak (c) make a parking alarm (d) close a window in rain
19. 19.Which job needs a display? (a) show the temperature (b) turn to an exact angle (c) open a gate to 90° (d) beep an alarm
20. 20.🔍 Which sensor would you use to make a parking alarm? (a) a temperature sensor (b) a rain sensor (c) a gas sensor (d) a distance sensor
21. 21.⚙️ Which actuator would you use to move water to plants? (a) a motor (b) a pump (c) a display (d) a servo motor
22. 22.Which job needs an LED? (a) spin a robot’s wheels (b) move water to plants (c) turn to an exact angle (d) show a status light
23. 23.Which job needs a buzzer? (a) turn to an exact angle (b) show the temperature (c) beep an alarm (d) move water to plants
24. 24.Which job needs a sound sensor? (a) make a parking alarm (b) keep an incubator warm (c) switch on lamps at dusk (d) measure classroom noise
25. 25.🔍 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?
26. 26.Which job needs a light sensor? (a) make a parking alarm (b) open blinds at sunrise (c) water a dry plant (d) measure classroom noise
27. 27.True or false: to open blinds at sunrise, use a light sensor. (a) True (b) False
28. 28.True or false: to switch on with a clap, use a sound sensor. (a) True (b) False
29. 29.True or false: to close a window in rain, use a gas sensor. (a) False (b) True
30. 30.Which job needs a light sensor? (a) measure classroom noise (b) keep an incubator warm (c) switch on lamps at dusk (d) spot someone walking in
31. 31.True or false: to water a dry plant, use a rain sensor. (a) True (b) False
32. 32.True or false: to stop a robot near walls, use a distance sensor. (a) False (b) True
33. 33.🔍 Which sensor would you use to measure classroom noise? (a) a soil moisture sensor (b) a distance sensor (c) a sound sensor (d) a motion sensor
34. 34.⚙️ Which actuator would you use to spin a robot’s wheels? (a) an LED (b) a pump (c) a motor (d) a buzzer
35. 35.🔍 Which sensor would you use to open blinds at sunrise? (a) a sound sensor (b) a light sensor (c) a distance sensor (d) a soil moisture sensor
36. 36.🔍 Which sensor would you use to close a window in rain? (a) a motion sensor (b) a rain sensor (c) a soil moisture sensor (d) a gas sensor
37. 37.True or false: to make a parking alarm, use a rain sensor. (a) True (b) False
38. 38.True or false: to make a parking alarm, use a temperature sensor. (a) False (b) True
39. 39.True or false: to start a fan when hot, use a temperature sensor. (a) True (b) False
40. 40.🔍 An object is 102 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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