Electronics Worksheet: Sensors and Actuators

Electronics lesson 26: Sensors and actuators · Set 326 · 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 program (c) an output that acts (d) a sensor
2. 2.Which job needs a motor? (a) turn to an exact angle (b) open a gate to 90° (c) spin a robot’s wheels (d) move water to plants
3. 3.Which job needs a sound sensor? (a) switch on with a clap (b) spot someone walking in (c) start a fan when hot (d) stop a robot near walls
4. 4.True or false: to close a window in rain, use a rain sensor. (a) True (b) False
5. 5.True or false: to open blinds at sunrise, use a light sensor. (a) True (b) False
6. 6.🔍 An object is 102 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
7. 7.🔍 A distance sensor sends a sound pulse and hears the echo 16 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
8. 8.🔍 Which sensor would you use to measure classroom noise? (a) a distance sensor (b) a temperature sensor (c) a light sensor (d) a sound sensor
9. 9.Which job needs a distance sensor? (a) make a parking alarm (b) switch on with a clap (c) open blinds at sunrise (d) measure classroom noise
10. 10.🔍 Which sensor would you use to water a dry plant? (a) a light sensor (b) a sound sensor (c) a soil moisture sensor (d) a temperature sensor
11. 11.🔍 A distance sensor sends a sound pulse and hears the echo 15 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
12. 12.Which job needs a motion sensor? (a) start a fan when hot (b) spot someone walking in (c) open blinds at sunrise (d) stop a robot near walls
13. 13.⚙️ Which actuator would you use to spin a robot’s wheels? (a) a servo motor (b) a motor (c) a display (d) a pump
14. 14.Which job needs a display? (a) show the temperature (b) move water to plants (c) beep an alarm (d) show a status light
15. 15.⚙️ Which actuator would you use to move water to plants? (a) a pump (b) an LED (c) a motor (d) a buzzer
16. 16.True or false: to measure classroom noise, use a sound sensor. (a) True (b) False
17. 17.Which job needs a light sensor? (a) make a parking alarm (b) close a window in rain (c) switch on lamps at dusk (d) start a fan when hot
18. 18.🔍 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?
19. 19.True or false: to start a fan when hot, use a light sensor. (a) False (b) True
20. 20.⚙️ Which actuator would you use to turn to an exact angle? (a) a servo motor (b) a motor (c) a buzzer (d) an LED
21. 21.True or false: to start a fan when hot, use a rain sensor. (a) False (b) True
22. 22.Which job needs a buzzer? (a) show a status light (b) spin a robot’s wheels (c) beep an alarm (d) turn to an exact angle
23. 23.🔍 An object is 34 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
24. 24.True or false: to spot someone walking in, use a motion sensor. (a) True (b) False
25. 25.🔍 Which sensor would you use to start a fan when hot? (a) a soil moisture sensor (b) a light sensor (c) a sound sensor (d) a temperature sensor
26. 26.⚙️ Which actuator would you use to open a gate to 90°? (a) a servo motor (b) a motor (c) a buzzer (d) a display
27. 27.Which job needs a servo motor? (a) turn to an exact angle (b) show a status light (c) move water to plants (d) spin a robot’s wheels
28. 28.True or false: to warn of a gas leak, use a gas sensor. (a) False (b) True
29. 29.Which job needs a light sensor? (a) open blinds at sunrise (b) switch on with a clap (c) measure classroom noise (d) stop a robot near walls
30. 30.Which job needs an LED? (a) turn to an exact angle (b) show a status light (c) spin a robot’s wheels (d) open a gate to 90°
31. 31.True or false: to switch on lamps at dusk, use a light sensor. (a) False (b) True
32. 32.Which job needs a soil moisture sensor? (a) open blinds at sunrise (b) warn of a gas leak (c) close a window in rain (d) water a dry plant
33. 33.⚙️ Which actuator would you use to show the temperature? (a) a buzzer (b) a display (c) an LED (d) a pump
34. 34.Which job needs a gas sensor? (a) measure classroom noise (b) warn of a gas leak (c) start a fan when hot (d) switch on lamps at dusk
35. 35.🔍 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)?
36. 36.Which job needs a pump? (a) turn to an exact angle (b) spin a robot’s wheels (c) show a status light (d) move water to plants
37. 37.🔍 Which sensor would you use to switch on lamps at dusk? (a) a temperature sensor (b) a motion sensor (c) a distance sensor (d) a light sensor
38. 38.Which job needs a rain sensor? (a) stop a robot near walls (b) switch on with a clap (c) water a dry plant (d) close a window in rain
39. 39.🔍 A distance sensor sends a sound pulse and hears the echo 9 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
40. 40.True or false: to water a dry plant, use a light sensor. (a) True (b) False

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