Electronics Worksheet: Sensors and Actuators

Electronics lesson 26: Sensors and actuators · Set 344 · 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.True or false: to keep an incubator warm, use a sound sensor. (a) False (b) True
2. 2.⚙️ Which actuator would you use to turn to an exact angle? (a) a motor (b) an LED (c) a buzzer (d) a servo motor
3. 3.🔍 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)?
4. 4.🔍 Which sensor would you use to keep an incubator warm? (a) a temperature sensor (b) a soil moisture sensor (c) a gas sensor (d) a rain sensor
5. 5.🔍 For a microcontroller, is a sensor an input or an output? (a) an input (b) a power source (c) an output (d) a fuse
6. 6.Which job needs a temperature sensor? (a) close a window in rain (b) measure classroom noise (c) open blinds at sunrise (d) keep an incubator warm
7. 7.True or false: to start a fan when hot, use a temperature sensor. (a) True (b) False
8. 8.Which job needs a rain sensor? (a) keep an incubator warm (b) stop a robot near walls (c) close a window in rain (d) warn of a gas leak
9. 9.🔍 A distance sensor sends a sound pulse and hears the echo 4 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 lamps at dusk? (a) a gas sensor (b) a temperature sensor (c) a distance sensor (d) a light sensor
11. 11.🔍 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)?
12. 12.⚙️ Which actuator would you use to beep an alarm? (a) a motor (b) a buzzer (c) a pump (d) a display
13. 13.⚙️ What is an actuator? (a) an output that acts (b) a program (c) a battery (d) a sensor
14. 14.🔍 Which sensor would you use to open blinds at sunrise? (a) a soil moisture sensor (b) a distance sensor (c) a temperature sensor (d) a light sensor
15. 15.⚙️ Which actuator would you use to show a status light? (a) a buzzer (b) an LED (c) a pump (d) a display
16. 16.True or false: to make a parking alarm, use a light sensor. (a) True (b) False
17. 17.Which job needs a servo motor? (a) spin a robot’s wheels (b) open a gate to 90° (c) show a status light (d) beep an alarm
18. 18.Which job needs a soil moisture sensor? (a) water a dry plant (b) switch on with a clap (c) open blinds at sunrise (d) switch on lamps at dusk
19. 19.Which job needs a display? (a) show the temperature (b) spin a robot’s wheels (c) open a gate to 90° (d) turn to an exact angle
20. 20.True or false: to warn of a gas leak, use a sound sensor. (a) False (b) True
21. 21.True or false: to stop a robot near walls, use a motion sensor. (a) False (b) True
22. 22.🔍 A distance sensor sends a sound pulse and hears the echo 10 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 move water to plants? (a) a servo motor (b) a pump (c) a motor (d) a buzzer
24. 24.Which job needs a pump? (a) spin a robot’s wheels (b) move water to plants (c) turn to an exact angle (d) show the temperature
25. 25.🔍 Which sensor would you use to switch on with a clap? (a) a motion sensor (b) a distance sensor (c) a soil moisture sensor (d) a sound sensor
26. 26.🔍 A distance sensor sends a sound pulse and hears the echo 17 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
27. 27.🔍 A distance sensor sends a sound pulse and hears the echo 8 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
28. 28.⚙️ Which actuator would you use to open a gate to 90°? (a) a display (b) a servo motor (c) a motor (d) a buzzer
29. 29.🔍 Which sensor would you use to make a parking alarm? (a) a gas sensor (b) a distance sensor (c) a motion sensor (d) a sound sensor
30. 30.Which job needs a temperature sensor? (a) start a fan when hot (b) open blinds at sunrise (c) close a window in rain (d) stop a robot near walls
31. 31.True or false: to start a fan when hot, use a gas sensor. (a) True (b) False
32. 32.Which job needs a motion sensor? (a) open blinds at sunrise (b) switch on lamps at dusk (c) water a dry plant (d) spot someone walking in
33. 33.🔍 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?
34. 34.🔍 An object is 255 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
35. 35.🔍 An object is 187 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
36. 36.Which job needs a gas sensor? (a) start a fan when hot (b) switch on lamps at dusk (c) warn of a gas leak (d) spot someone walking in
37. 37.True or false: to open blinds at sunrise, use a light sensor. (a) False (b) True
38. 38.🔍 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)?
39. 39.True or false: to measure classroom noise, use a gas sensor. (a) False (b) True
40. 40.Which job needs a buzzer? (a) spin a robot’s wheels (b) move water to plants (c) open a gate to 90° (d) beep an alarm

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