Electronics Worksheet: Sensors and Actuators

Electronics lesson 26: Sensors and actuators · Set 105 · 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.⚙️ What is an actuator? (a) a sensor (b) a program (c) a battery (d) an output that acts
2. 2.🔍 A distance sensor sends a sound pulse and hears the echo 3 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
3. 3.Which job needs an LED? (a) move water to plants (b) turn to an exact angle (c) show a status light (d) spin a robot’s wheels
4. 4.🔍 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)?
5. 5.🔍 Which sensor would you use to spot someone walking in? (a) a gas sensor (b) a sound sensor (c) a motion sensor (d) a soil moisture sensor
6. 6.⚙️ Which actuator would you use to spin a robot’s wheels? (a) a servo motor (b) a buzzer (c) an LED (d) a motor
7. 7.Which job needs a buzzer? (a) spin a robot’s wheels (b) show the temperature (c) beep an alarm (d) move water to plants
8. 8.Which job needs a light sensor? (a) open blinds at sunrise (b) spot someone walking in (c) measure classroom noise (d) close a window in rain
9. 9.⚙️ Which actuator would you use to show the temperature? (a) a buzzer (b) a servo motor (c) a display (d) an LED
10. 10.True or false: to close a window in rain, use a light sensor. (a) False (b) True
11. 11.True or false: to make a parking alarm, use a light sensor. (a) False (b) True
12. 12.🔍 For a microcontroller, is a sensor an input or an output? (a) a power source (b) an output (c) an input (d) a fuse
13. 13.🔍 A distance sensor sends a sound pulse and hears the echo 13 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
14. 14.True or false: to water a dry plant, use a soil moisture sensor. (a) False (b) True
15. 15.⚙️ Which actuator would you use to move water to plants? (a) a motor (b) a servo motor (c) a pump (d) a display
16. 16.🔍 A distance sensor sends a sound pulse and hears the echo 12 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
17. 17.🔍 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?
18. 18.⚙️ Which actuator would you use to show a status light? (a) a display (b) an LED (c) a motor (d) a servo motor
19. 19.True or false: to keep an incubator warm, use a temperature sensor. (a) True (b) False
20. 20.True or false: to switch on with a clap, use a sound sensor. (a) True (b) False
21. 21.Which job needs a temperature sensor? (a) keep an incubator warm (b) switch on lamps at dusk (c) open blinds at sunrise (d) close a window in rain
22. 22.True or false: to keep an incubator warm, use a gas sensor. (a) False (b) True
23. 23.Which job needs a motor? (a) beep an alarm (b) turn to an exact angle (c) show a status light (d) spin a robot’s wheels
24. 24.True or false: to spot someone walking in, use a motion sensor. (a) False (b) True
25. 25.🔍 Which sensor would you use to keep an incubator warm? (a) a temperature sensor (b) a motion sensor (c) a rain sensor (d) a gas sensor
26. 26.🔍 A distance sensor sends a sound pulse and hears the echo 6 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
27. 27.True or false: to water a dry plant, use a rain sensor. (a) True (b) False
28. 28.⚙️ Which actuator would you use to beep an alarm? (a) a motor (b) a display (c) a buzzer (d) an LED
29. 29.Which job needs a display? (a) show a status light (b) open a gate to 90° (c) turn to an exact angle (d) show the temperature
30. 30.Which job needs a light sensor? (a) make a parking alarm (b) warn of a gas leak (c) keep an incubator warm (d) switch on lamps at dusk
31. 31.🔍 Which sensor would you use to warn of a gas leak? (a) a temperature sensor (b) a light sensor (c) a gas sensor (d) a motion sensor
32. 32.True or false: to spot someone walking in, use a soil moisture sensor. (a) True (b) False
33. 33.🔍 Which sensor would you use to open blinds at sunrise? (a) a temperature sensor (b) a sound sensor (c) a light sensor (d) a soil moisture sensor
34. 34.True or false: to open blinds at sunrise, use a rain sensor. (a) True (b) False
35. 35.Which job needs a gas sensor? (a) switch on lamps at dusk (b) switch on with a clap (c) keep an incubator warm (d) warn of a gas leak
36. 36.True or false: to stop a robot near walls, use a distance sensor. (a) True (b) False
37. 37.🔍 Which sensor would you use to switch on lamps at dusk? (a) a soil moisture sensor (b) a light sensor (c) a temperature sensor (d) a sound sensor
38. 38.Which job needs a servo motor? (a) show a status light (b) show the temperature (c) turn to an exact angle (d) spin a robot’s wheels
39. 39.Which job needs a distance sensor? (a) close a window in rain (b) measure classroom noise (c) stop a robot near walls (d) warn of a gas leak
40. 40.Which job needs a sound sensor? (a) measure classroom noise (b) spot someone walking in (c) open blinds at sunrise (d) close a window in rain

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