Electronics Worksheet: Sensors and Actuators

Electronics lesson 26: Sensors and actuators · Set 104 · 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 an LED? (a) move water to plants (b) beep an alarm (c) spin a robot’s wheels (d) show a status light
2. 2.🔍 Which sensor would you use to keep an incubator warm? (a) a gas sensor (b) a rain sensor (c) a soil moisture sensor (d) a temperature sensor
3. 3.🔍 For a microcontroller, is a sensor an input or an output? (a) an input (b) an output (c) a fuse (d) a power source
4. 4.🔍 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?
5. 5.Which job needs a distance sensor? (a) stop a robot near walls (b) start a fan when hot (c) switch on with a clap (d) spot someone walking in
6. 6.Which job needs a temperature sensor? (a) keep an incubator warm (b) open blinds at sunrise (c) spot someone walking in (d) switch on lamps at dusk
7. 7.Which job needs a soil moisture sensor? (a) keep an incubator warm (b) open blinds at sunrise (c) start a fan when hot (d) water a dry plant
8. 8.Which job needs a display? (a) move water to plants (b) open a gate to 90° (c) turn to an exact angle (d) show the temperature
9. 9.Which job needs a buzzer? (a) move water to plants (b) turn to an exact angle (c) spin a robot’s wheels (d) beep an alarm
10. 10.True or false: to measure classroom noise, use a sound sensor. (a) True (b) False
11. 11.⚙️ Which actuator would you use to turn to an exact angle? (a) a servo motor (b) a display (c) an LED (d) a buzzer
12. 12.Which job needs a light sensor? (a) close a window in rain (b) warn of a gas leak (c) switch on lamps at dusk (d) measure classroom noise
13. 13.⚙️ Which actuator would you use to spin a robot’s wheels? (a) a motor (b) a servo motor (c) a buzzer (d) an LED
14. 14.Which job needs a pump? (a) show a status light (b) move water to plants (c) turn to an exact angle (d) show the temperature
15. 15.🔍 Which sensor would you use to warn of a gas leak? (a) a gas sensor (b) a light sensor (c) a motion sensor (d) a temperature sensor
16. 16.🔍 Which sensor would you use to open blinds at sunrise? (a) a distance sensor (b) a light sensor (c) a sound sensor (d) a gas sensor
17. 17.🔍 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?
18. 18.True or false: to make a parking alarm, use a motion sensor. (a) False (b) True
19. 19.🔍 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?
20. 20.Which job needs a sound sensor? (a) switch on lamps at dusk (b) open blinds at sunrise (c) keep an incubator warm (d) measure classroom noise
21. 21.Which job needs a distance sensor? (a) switch on lamps at dusk (b) switch on with a clap (c) start a fan when hot (d) make a parking alarm
22. 22.🔍 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)?
23. 23.⚙️ Which actuator would you use to open a gate to 90°? (a) a motor (b) an LED (c) a buzzer (d) a servo motor
24. 24.Which job needs a motion sensor? (a) warn of a gas leak (b) spot someone walking in (c) start a fan when hot (d) make a parking alarm
25. 25.⚙️ Which actuator would you use to beep an alarm? (a) a display (b) a buzzer (c) a servo motor (d) a motor
26. 26.🔍 Which sensor would you use to spot someone walking in? (a) a gas sensor (b) a motion sensor (c) a rain sensor (d) a soil moisture sensor
27. 27.🔍 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)?
28. 28.⚙️ What is an actuator? (a) an output that acts (b) a program (c) a battery (d) a sensor
29. 29.True or false: to keep an incubator warm, use a temperature sensor. (a) True (b) False
30. 30.⚙️ Which actuator would you use to show a status light? (a) a display (b) a servo motor (c) a pump (d) an LED
31. 31.🔍 Which sensor would you use to close a window in rain? (a) a rain sensor (b) a temperature sensor (c) a soil moisture sensor (d) a gas sensor
32. 32.⚙️ Which actuator would you use to show the temperature? (a) a pump (b) a buzzer (c) a display (d) an LED
33. 33.🔍 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?
34. 34.🔍 Which sensor would you use to switch on lamps at dusk? (a) a light sensor (b) a distance sensor (c) a temperature sensor (d) a sound sensor
35. 35.True or false: to measure classroom noise, use a soil moisture sensor. (a) False (b) True
36. 36.True or false: to start a fan when hot, use a light sensor. (a) False (b) True
37. 37.🔍 Which sensor would you use to start a fan when hot? (a) a sound sensor (b) a motion sensor (c) a temperature sensor (d) a gas sensor
38. 38.🔍 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)?
39. 39.Which job needs a servo motor? (a) spin a robot’s wheels (b) move water to plants (c) turn to an exact angle (d) show a status light
40. 40.True or false: to make a parking alarm, use a rain sensor. (a) True (b) False

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