Electronics Worksheet: Sensors and Actuators

Electronics lesson 26: Sensors and actuators · Set 291 · 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 the temperature? (a) a pump (b) a buzzer (c) a display (d) a motor
2. 2.🔍 For a microcontroller, is a sensor an input or an output? (a) an output (b) a power source (c) an input (d) a fuse
3. 3.🔍 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)?
4. 4.⚙️ What is an actuator? (a) a sensor (b) a program (c) a battery (d) an output that acts
5. 5.True or false: to start a fan when hot, use a distance sensor. (a) True (b) False
6. 6.🔍 Which sensor would you use to make a parking alarm? (a) a soil moisture sensor (b) a light sensor (c) a motion sensor (d) a distance sensor
7. 7.⚙️ Which actuator would you use to show a status light? (a) a motor (b) a buzzer (c) an LED (d) a pump
8. 8.🔍 An object is 340 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
9. 9.Which job needs a servo motor? (a) spin a robot’s wheels (b) turn to an exact angle (c) move water to plants (d) show the temperature
10. 10.🔍 Which sensor would you use to water a dry plant? (a) a soil moisture sensor (b) a motion sensor (c) a light sensor (d) a temperature sensor
11. 11.⚙️ Which actuator would you use to turn to an exact angle? (a) a servo motor (b) an LED (c) a pump (d) a display
12. 12.Which job needs a servo motor? (a) show the temperature (b) beep an alarm (c) open a gate to 90° (d) show a status light
13. 13.True or false: to spot someone walking in, use a motion sensor. (a) False (b) True
14. 14.True or false: to stop a robot near walls, use a distance sensor. (a) True (b) False
15. 15.Which job needs a display? (a) show the temperature (b) spin a robot’s wheels (c) show a status light (d) open a gate to 90°
16. 16.Which job needs a pump? (a) spin a robot’s wheels (b) turn to an exact angle (c) move water to plants (d) open a gate to 90°
17. 17.Which job needs a buzzer? (a) turn to an exact angle (b) beep an alarm (c) show a status light (d) show the temperature
18. 18.🔍 Which sensor would you use to switch on lamps at dusk? (a) a temperature sensor (b) a sound sensor (c) a light sensor (d) a distance sensor
19. 19.Which job needs a temperature sensor? (a) switch on with a clap (b) make a parking alarm (c) measure classroom noise (d) start a fan when hot
20. 20.🔍 Which sensor would you use to warn of a gas leak? (a) a temperature sensor (b) a gas sensor (c) a distance sensor (d) a motion sensor
21. 21.Which job needs a light sensor? (a) stop a robot near walls (b) open blinds at sunrise (c) warn of a gas leak (d) close a window in rain
22. 22.True or false: to measure classroom noise, use a temperature sensor. (a) False (b) True
23. 23.⚙️ Which actuator would you use to spin a robot’s wheels? (a) a servo motor (b) a motor (c) an LED (d) a buzzer
24. 24.🔍 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)?
25. 25.🔍 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?
26. 26.Which job needs a motor? (a) beep an alarm (b) spin a robot’s wheels (c) move water to plants (d) open a gate to 90°
27. 27.🔍 A distance sensor sends a sound pulse and hears the echo 17 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
28. 28.🔍 Which sensor would you use to switch on with a clap? (a) a light sensor (b) a temperature sensor (c) a sound sensor (d) a gas sensor
29. 29.⚙️ Which actuator would you use to move water to plants? (a) a display (b) a servo motor (c) a motor (d) a pump
30. 30.🔍 An object is 221 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
31. 31.🔍 An object is 136 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
32. 32.⚙️ Which actuator would you use to beep an alarm? (a) a display (b) a buzzer (c) an LED (d) a motor
33. 33.🔍 Which sensor would you use to start a fan when hot? (a) a motion sensor (b) a light sensor (c) a distance sensor (d) a temperature sensor
34. 34.🔍 Which sensor would you use to keep an incubator warm? (a) a rain sensor (b) a motion sensor (c) a temperature sensor (d) a distance sensor
35. 35.True or false: to open blinds at sunrise, use a gas sensor. (a) True (b) False
36. 36.Which job needs a temperature sensor? (a) measure classroom noise (b) stop a robot near walls (c) keep an incubator warm (d) make a parking alarm
37. 37.Which job needs a light sensor? (a) keep an incubator warm (b) spot someone walking in (c) switch on lamps at dusk (d) start a fan when hot
38. 38.Which job needs a motion sensor? (a) close a window in rain (b) spot someone walking in (c) water a dry plant (d) measure classroom noise
39. 39.Which job needs a gas sensor? (a) warn of a gas leak (b) water a dry plant (c) measure classroom noise (d) stop a robot near walls
40. 40.🔍 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)?

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