Electronics Worksheet: Sensors and Actuators

Electronics lesson 26: Sensors and actuators · Set 280 · 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 open a gate to 90°? (a) a servo motor (b) an LED (c) a buzzer (d) a pump
2. 2.⚙️ Which actuator would you use to beep an alarm? (a) a servo motor (b) a pump (c) a buzzer (d) a display
3. 3.Which job needs a gas sensor? (a) make a parking alarm (b) spot someone walking in (c) warn of a gas leak (d) keep an incubator warm
4. 4.🔍 Which sensor would you use to keep an incubator warm? (a) a gas sensor (b) a temperature sensor (c) a soil moisture sensor (d) a light sensor
5. 5.🔍 Which sensor would you use to switch on lamps at dusk? (a) a gas sensor (b) a soil moisture sensor (c) a distance sensor (d) a light sensor
6. 6.⚙️ What is an actuator? (a) a battery (b) a sensor (c) a program (d) an output that acts
7. 7.Which job needs a rain sensor? (a) measure classroom noise (b) water a dry plant (c) close a window in rain (d) open blinds at sunrise
8. 8.⚙️ Which actuator would you use to turn to an exact angle? (a) a display (b) an LED (c) a motor (d) a servo motor
9. 9.🔍 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)?
10. 10.Which job needs a servo motor? (a) open a gate to 90° (b) show a status light (c) move water to plants (d) show the temperature
11. 11.Which job needs a buzzer? (a) turn to an exact angle (b) open a gate to 90° (c) beep an alarm (d) spin a robot’s wheels
12. 12.🔍 Which sensor would you use to stop a robot near walls? (a) a distance sensor (b) a light sensor (c) a sound sensor (d) a temperature sensor
13. 13.Which job needs a motor? (a) move water to plants (b) spin a robot’s wheels (c) beep an alarm (d) show a status light
14. 14.Which job needs a display? (a) open a gate to 90° (b) show the temperature (c) show a status light (d) spin a robot’s wheels
15. 15.⚙️ Which actuator would you use to move water to plants? (a) a pump (b) a servo motor (c) a motor (d) an LED
16. 16.⚙️ Which actuator would you use to show the temperature? (a) a motor (b) a pump (c) a display (d) a servo motor
17. 17.🔍 For a microcontroller, is a sensor an input or an output? (a) an input (b) a fuse (c) a power source (d) an output
18. 18.⚙️ Which actuator would you use to spin a robot’s wheels? (a) an LED (b) a pump (c) a servo motor (d) a motor
19. 19.True or false: to close a window in rain, use a temperature sensor. (a) False (b) True
20. 20.True or false: to switch on with a clap, use a light sensor. (a) True (b) False
21. 21.True or false: to start a fan when hot, use a sound sensor. (a) False (b) True
22. 22.Which job needs a pump? (a) show the temperature (b) beep an alarm (c) move water to plants (d) open a gate to 90°
23. 23.True or false: to make a parking alarm, use a light sensor. (a) True (b) False
24. 24.🔍 A distance sensor sends a sound pulse and hears the echo 16 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
25. 25.🔍 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)?
26. 26.Which job needs a temperature sensor? (a) start a fan when hot (b) warn of a gas leak (c) switch on with a clap (d) measure classroom noise
27. 27.🔍 Which sensor would you use to water a dry plant? (a) a light sensor (b) a sound sensor (c) a distance sensor (d) a soil moisture sensor
28. 28.🔍 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?
29. 29.🔍 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?
30. 30.True or false: to keep an incubator warm, use a rain sensor. (a) False (b) True
31. 31.True or false: to make a parking alarm, use a distance sensor. (a) True (b) False
32. 32.Which job needs an LED? (a) beep an alarm (b) show the temperature (c) show a status light (d) open a gate to 90°
33. 33.Which job needs a light sensor? (a) make a parking alarm (b) measure classroom noise (c) open blinds at sunrise (d) warn of a gas leak
34. 34.True or false: to start a fan when hot, use a temperature sensor. (a) True (b) False
35. 35.True or false: to make a parking alarm, use a motion sensor. (a) True (b) False
36. 36.🔍 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)?
37. 37.🔍 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?
38. 38.🔍 Which sensor would you use to spot someone walking in? (a) a motion sensor (b) a light sensor (c) a distance sensor (d) a rain sensor
39. 39.True or false: to warn of a gas leak, use a gas sensor. (a) True (b) False
40. 40.True or false: to switch on lamps at dusk, use a soil moisture sensor. (a) True (b) False

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