Electronics Worksheet: Sensors and Actuators

Electronics lesson 26: Sensors and actuators · Set 334 · 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.🔍 For a microcontroller, is a sensor an input or an output? (a) an output (b) an input (c) a fuse (d) a power source
2. 2.Which job needs a motor? (a) beep an alarm (b) open a gate to 90° (c) spin a robot’s wheels (d) move water to plants
3. 3.Which job needs a soil moisture sensor? (a) spot someone walking in (b) close a window in rain (c) water a dry plant (d) switch on lamps at dusk
4. 4.⚙️ Which actuator would you use to spin a robot’s wheels? (a) a display (b) a motor (c) a servo motor (d) an LED
5. 5.🔍 Which sensor would you use to start a fan when hot? (a) a distance sensor (b) a sound sensor (c) a temperature sensor (d) a light sensor
6. 6.True or false: to start a fan when hot, use a temperature sensor. (a) True (b) False
7. 7.True or false: to make a parking alarm, use a soil moisture sensor. (a) False (b) True
8. 8.🔍 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 motion sensor
9. 9.🔍 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)?
10. 10.🔍 Which sensor would you use to switch on with a clap? (a) a soil moisture sensor (b) a gas sensor (c) a sound sensor (d) a rain sensor
11. 11.🔍 A distance sensor sends a sound pulse and hears the echo 2 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
12. 12.⚙️ What is an actuator? (a) an output that acts (b) a program (c) a battery (d) a sensor
13. 13.🔍 An object is 68 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
14. 14.⚙️ Which actuator would you use to move water to plants? (a) a servo motor (b) an LED (c) a buzzer (d) a pump
15. 15.Which job needs a light sensor? (a) keep an incubator warm (b) switch on lamps at dusk (c) close a window in rain (d) warn of a gas leak
16. 16.True or false: to spot someone walking in, use a soil moisture sensor. (a) False (b) True
17. 17.🔍 Which sensor would you use to make a parking alarm? (a) a rain sensor (b) a temperature sensor (c) a distance sensor (d) a sound sensor
18. 18.🔍 Which sensor would you use to open blinds at sunrise? (a) a gas sensor (b) a motion sensor (c) a soil moisture sensor (d) a light sensor
19. 19.True or false: to water a dry plant, use a motion sensor. (a) True (b) False
20. 20.Which job needs an LED? (a) turn to an exact angle (b) show a status light (c) move water to plants (d) show the temperature
21. 21.Which job needs a buzzer? (a) beep an alarm (b) move water to plants (c) open a gate to 90° (d) show the temperature
22. 22.True or false: to spot someone walking in, use a motion sensor. (a) False (b) True
23. 23.True or false: to open blinds at sunrise, use a light sensor. (a) False (b) True
24. 24.Which job needs a distance sensor? (a) stop a robot near walls (b) switch on with a clap (c) measure classroom noise (d) water a dry plant
25. 25.Which job needs a servo motor? (a) show the temperature (b) open a gate to 90° (c) move water to plants (d) beep an alarm
26. 26.⚙️ Which actuator would you use to show the temperature? (a) a display (b) a pump (c) a servo motor (d) a motor
27. 27.True or false: to make a parking alarm, use a temperature sensor. (a) True (b) False
28. 28.Which job needs a display? (a) show a status light (b) show the temperature (c) beep an alarm (d) open a gate to 90°
29. 29.Which job needs a temperature sensor? (a) stop a robot near walls (b) warn of a gas leak (c) switch on lamps at dusk (d) start a fan when hot
30. 30.Which job needs a rain sensor? (a) stop a robot near walls (b) close a window in rain (c) start a fan when hot (d) switch on with a clap
31. 31.🔍 Which sensor would you use to measure classroom noise? (a) a light sensor (b) a gas sensor (c) a distance sensor (d) a sound sensor
32. 32.🔍 An object is 85 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
33. 33.🔍 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)?
34. 34.🔍 Which sensor would you use to water a dry plant? (a) a temperature sensor (b) a light sensor (c) a soil moisture sensor (d) a distance sensor
35. 35.True or false: to warn of a gas leak, use a gas sensor. (a) True (b) False
36. 36.Which job needs a pump? (a) show a status light (b) show the temperature (c) move water to plants (d) spin a robot’s wheels
37. 37.🔍 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)?
38. 38.Which job needs a servo motor? (a) move water to plants (b) turn to an exact angle (c) show a status light (d) spin a robot’s wheels
39. 39.⚙️ Which actuator would you use to open a gate to 90°? (a) a servo motor (b) an LED (c) a buzzer (d) a pump
40. 40.True or false: to open blinds at sunrise, use a motion sensor. (a) False (b) True

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