Electronics Worksheet: Sensors and Actuators

Electronics lesson 26: Sensors and actuators · Set 248 · 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.⚙️ What is an actuator? (a) a battery (b) a sensor (c) an output that acts (d) a program
2. 2.Which job needs a servo motor? (a) beep an alarm (b) spin a robot’s wheels (c) turn to an exact angle (d) show a status light
3. 3.🔍 Which sensor would you use to switch on lamps at dusk? (a) a rain sensor (b) a light sensor (c) a temperature sensor (d) a gas sensor
4. 4.Which job needs a gas sensor? (a) water a dry plant (b) make a parking alarm (c) warn of a gas leak (d) stop a robot near walls
5. 5.🔍 Which sensor would you use to keep an incubator warm? (a) a temperature sensor (b) a gas sensor (c) a light sensor (d) a soil moisture sensor
6. 6.⚙️ Which actuator would you use to turn to an exact angle? (a) an LED (b) a buzzer (c) a display (d) a servo motor
7. 7.Which job needs a servo motor? (a) open a gate to 90° (b) move water to plants (c) show the temperature (d) spin a robot’s wheels
8. 8.🔍 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)?
9. 9.Which job needs a motion sensor? (a) start a fan when hot (b) switch on with a clap (c) spot someone walking in (d) open blinds at sunrise
10. 10.True or false: to warn of a gas leak, use a sound sensor. (a) False (b) True
11. 11.⚙️ Which actuator would you use to show a status light? (a) a buzzer (b) a pump (c) an LED (d) a display
12. 12.True or false: to open blinds at sunrise, use a light sensor. (a) False (b) True
13. 13.Which job needs a display? (a) spin a robot’s wheels (b) show the temperature (c) beep an alarm (d) open a gate to 90°
14. 14.🔍 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)?
15. 15.🔍 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)?
16. 16.⚙️ Which actuator would you use to spin a robot’s wheels? (a) a buzzer (b) a pump (c) a motor (d) a display
17. 17.Which job needs a pump? (a) beep an alarm (b) show the temperature (c) show a status light (d) move water to plants
18. 18.True or false: to make a parking alarm, use a sound sensor. (a) True (b) False
19. 19.Which job needs a sound sensor? (a) start a fan when hot (b) water a dry plant (c) keep an incubator warm (d) switch on with a clap
20. 20.True or false: to water a dry plant, use a soil moisture sensor. (a) False (b) True
21. 21.🔍 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)?
22. 22.🔍 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?
23. 23.🔍 Which sensor would you use to stop a robot near walls? (a) a temperature sensor (b) a gas sensor (c) a rain sensor (d) a distance sensor
24. 24.True or false: to switch on with a clap, use a soil moisture sensor. (a) False (b) True
25. 25.Which job needs a light sensor? (a) close a window in rain (b) switch on lamps at dusk (c) keep an incubator warm (d) switch on with a clap
26. 26.⚙️ Which actuator would you use to show the temperature? (a) a display (b) a buzzer (c) a motor (d) an LED
27. 27.True or false: to warn of a gas leak, use a rain sensor. (a) False (b) True
28. 28.⚙️ Which actuator would you use to beep an alarm? (a) a display (b) a motor (c) a buzzer (d) an LED
29. 29.True or false: to start a fan when hot, use a temperature sensor. (a) False (b) True
30. 30.True or false: to stop a robot near walls, use a distance sensor. (a) False (b) True
31. 31.Which job needs a rain sensor? (a) warn of a gas leak (b) close a window in rain (c) water a dry plant (d) make a parking alarm
32. 32.Which job needs an LED? (a) turn to an exact angle (b) show a status light (c) show the temperature (d) move water to plants
33. 33.🔍 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?
34. 34.🔍 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?
35. 35.True or false: to switch on with a clap, use a sound sensor. (a) False (b) True
36. 36.🔍 An object is 289 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
37. 37.Which job needs a soil moisture sensor? (a) switch on lamps at dusk (b) switch on with a clap (c) water a dry plant (d) open blinds at sunrise
38. 38.True or false: to spot someone walking in, use a motion sensor. (a) True (b) False
39. 39.🔍 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)?
40. 40.Which job needs a temperature sensor? (a) start a fan when hot (b) make a parking alarm (c) spot someone walking in (d) warn of a gas leak

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