Electronics Worksheet: Sensors and Actuators

Electronics lesson 26: Sensors and actuators · Set 301 · 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 job needs a pump? (a) show the temperature (b) beep an alarm (c) turn to an exact angle (d) move water to plants
2. 2.True or false: to warn of a gas leak, use a gas sensor. (a) True (b) False
3. 3.⚙️ Which actuator would you use to open a gate to 90°? (a) a display (b) an LED (c) a servo motor (d) a motor
4. 4.🔍 Which sensor would you use to make a parking alarm? (a) a temperature sensor (b) a distance sensor (c) a motion sensor (d) a soil moisture sensor
5. 5.Which job needs a sound sensor? (a) make a parking alarm (b) water a dry plant (c) measure classroom noise (d) spot someone walking in
6. 6.🔍 Which sensor would you use to open blinds at sunrise? (a) a sound sensor (b) a light sensor (c) a motion sensor (d) a gas sensor
7. 7.⚙️ Which actuator would you use to show a status light? (a) a display (b) a buzzer (c) an LED (d) a servo motor
8. 8.⚙️ What is an actuator? (a) a battery (b) a program (c) a sensor (d) an output that acts
9. 9.🔍 An object is 323 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
10. 10.⚙️ Which actuator would you use to spin a robot’s wheels? (a) a display (b) a buzzer (c) a motor (d) an LED
11. 11.Which job needs a display? (a) show the temperature (b) beep an alarm (c) open a gate to 90° (d) spin a robot’s wheels
12. 12.🔍 For a microcontroller, is a sensor an input or an output? (a) a fuse (b) a power source (c) an input (d) an output
13. 13.🔍 Which sensor would you use to keep an incubator warm? (a) a rain sensor (b) a temperature sensor (c) a soil moisture sensor (d) a distance sensor
14. 14.🔍 Which sensor would you use to measure classroom noise? (a) a motion sensor (b) a rain sensor (c) a temperature sensor (d) a sound sensor
15. 15.True or false: to spot someone walking in, use a light sensor. (a) True (b) False
16. 16.True or false: to measure classroom noise, use a motion sensor. (a) False (b) True
17. 17.True or false: to switch on lamps at dusk, use a light sensor. (a) True (b) False
18. 18.True or false: to switch on with a clap, use a sound 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.🔍 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)?
21. 21.🔍 A distance sensor sends a sound pulse and hears the echo 18 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
22. 22.True or false: to switch on with a clap, use a motion sensor. (a) False (b) True
23. 23.⚙️ Which actuator would you use to beep an alarm? (a) a display (b) a pump (c) a motor (d) a buzzer
24. 24.🔍 Which sensor would you use to close a window in rain? (a) a rain sensor (b) a gas sensor (c) a sound sensor (d) a light sensor
25. 25.⚙️ Which actuator would you use to turn to an exact angle? (a) a servo motor (b) a pump (c) an LED (d) a motor
26. 26.Which job needs an LED? (a) turn to an exact angle (b) beep an alarm (c) show a status light (d) open a gate to 90°
27. 27.True or false: to measure classroom noise, use a distance sensor. (a) True (b) False
28. 28.🔍 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)?
29. 29.True or false: to switch on lamps at dusk, use a gas sensor. (a) True (b) False
30. 30.🔍 Which sensor would you use to switch on lamps at dusk? (a) a rain sensor (b) a motion sensor (c) a light sensor (d) a soil moisture sensor
31. 31.🔍 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)?
32. 32.Which job needs a motion sensor? (a) keep an incubator warm (b) water a dry plant (c) spot someone walking in (d) make a parking alarm
33. 33.🔍 Which sensor would you use to start a fan when hot? (a) a soil moisture sensor (b) a temperature sensor (c) a light sensor (d) a gas sensor
34. 34.Which job needs a motor? (a) move water to plants (b) show a status light (c) spin a robot’s wheels (d) beep an alarm
35. 35.🔍 A distance sensor sends a sound pulse and hears the echo 11 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
36. 36.🔍 Which sensor would you use to stop a robot near walls? (a) a temperature sensor (b) a distance sensor (c) a sound sensor (d) a rain sensor
37. 37.Which job needs a temperature sensor? (a) water a dry plant (b) stop a robot near walls (c) make a parking alarm (d) start a fan when hot
38. 38.True or false: to switch on with a clap, use a rain sensor. (a) True (b) False
39. 39.🔍 An object is 119 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
40. 40.🔍 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)?

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