Electronics Worksheet: Sensors and Actuators

Electronics lesson 26: Sensors and actuators · Set 218 · 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 light sensor? (a) measure classroom noise (b) water a dry plant (c) switch on with a clap (d) open blinds at sunrise
2. 2.Which job needs a pump? (a) show the temperature (b) open a gate to 90° (c) turn to an exact angle (d) move water to plants
3. 3.🔍 Which sensor would you use to start a fan when hot? (a) a temperature sensor (b) a distance sensor (c) a rain sensor (d) a soil moisture sensor
4. 4.Which job needs a distance sensor? (a) spot someone walking in (b) stop a robot near walls (c) measure classroom noise (d) open blinds at sunrise
5. 5.Which job needs a temperature sensor? (a) spot someone walking in (b) make a parking alarm (c) stop a robot near walls (d) keep an incubator warm
6. 6.🔍 An object is 238 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
7. 7.Which job needs a sound sensor? (a) open blinds at sunrise (b) switch on lamps at dusk (c) make a parking alarm (d) switch on with a clap
8. 8.Which job needs a light sensor? (a) start a fan when hot (b) spot someone walking in (c) switch on lamps at dusk (d) water a dry plant
9. 9.🔍 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)?
10. 10.🔍 Which sensor would you use to water a dry plant? (a) a light sensor (b) a temperature sensor (c) a soil moisture sensor (d) a sound sensor
11. 11.True or false: to make a parking alarm, use a distance sensor. (a) True (b) False
12. 12.True or false: to spot someone walking in, use a sound sensor. (a) False (b) True
13. 13.🔍 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?
14. 14.🔍 For a microcontroller, is a sensor an input or an output? (a) a fuse (b) an input (c) a power source (d) an output
15. 15.🔍 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)?
16. 16.True or false: to close a window in rain, use a sound sensor. (a) False (b) True
17. 17.⚙️ Which actuator would you use to show a status light? (a) a pump (b) a motor (c) a servo motor (d) an LED
18. 18.True or false: to warn of a gas leak, use a soil moisture sensor. (a) False (b) True
19. 19.🔍 Which sensor would you use to switch on lamps at dusk? (a) a light sensor (b) a sound sensor (c) a soil moisture sensor (d) a rain sensor
20. 20.🔍 Which sensor would you use to open blinds at sunrise? (a) a light sensor (b) a motion sensor (c) a temperature sensor (d) a gas sensor
21. 21.⚙️ Which actuator would you use to spin a robot’s wheels? (a) a display (b) a servo motor (c) a pump (d) a motor
22. 22.Which job needs a display? (a) spin a robot’s wheels (b) move water to plants (c) beep an alarm (d) show the temperature
23. 23.Which job needs an LED? (a) spin a robot’s wheels (b) show a status light (c) beep an alarm (d) turn to an exact angle
24. 24.⚙️ Which actuator would you use to open a gate to 90°? (a) a servo motor (b) a buzzer (c) an LED (d) a pump
25. 25.Which job needs a motor? (a) open a gate to 90° (b) beep an alarm (c) spin a robot’s wheels (d) show a status light
26. 26.🔍 Which sensor would you use to spot someone walking in? (a) a soil moisture sensor (b) a temperature sensor (c) a motion sensor (d) a rain sensor
27. 27.⚙️ What is an actuator? (a) a battery (b) an output that acts (c) a program (d) a sensor
28. 28.Which job needs a gas sensor? (a) measure classroom noise (b) open blinds at sunrise (c) warn of a gas leak (d) switch on lamps at dusk
29. 29.Which job needs a buzzer? (a) turn to an exact angle (b) show the temperature (c) beep an alarm (d) show a status light
30. 30.🔍 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 rain sensor
31. 31.🔍 An object is 272 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
32. 32.Which job needs a rain sensor? (a) switch on with a clap (b) close a window in rain (c) switch on lamps at dusk (d) spot someone walking in
33. 33.Which job needs a soil moisture sensor? (a) make a parking alarm (b) water a dry plant (c) keep an incubator warm (d) switch on lamps at dusk
34. 34.⚙️ Which actuator would you use to show the temperature? (a) a servo motor (b) a pump (c) a display (d) a motor
35. 35.True or false: to water a dry plant, use a light sensor. (a) True (b) False
36. 36.🔍 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)?
37. 37.True or false: to warn of a gas leak, use a gas sensor. (a) False (b) True
38. 38.Which job needs a motion sensor? (a) spot someone walking in (b) water a dry plant (c) start a fan when hot (d) keep an incubator warm
39. 39.True or false: to switch on lamps at dusk, use a temperature sensor. (a) False (b) True
40. 40.Which job needs a servo motor? (a) spin a robot’s wheels (b) show a status light (c) turn to an exact angle (d) show the temperature

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