Electronics Worksheet: Sensors and Actuators

Electronics lesson 26: Sensors and actuators · Set 268 · 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 motor? (a) beep an alarm (b) turn to an exact angle (c) move water to plants (d) spin a robot’s wheels
2. 2.⚙️ Which actuator would you use to beep an alarm? (a) a buzzer (b) a servo motor (c) an LED (d) a motor
3. 3.True or false: to water a dry plant, use a sound sensor. (a) False (b) True
4. 4.🔍 Which sensor would you use to measure classroom noise? (a) a motion sensor (b) a sound sensor (c) a rain sensor (d) a gas sensor
5. 5.True or false: to measure classroom noise, use a sound sensor. (a) False (b) True
6. 6.Which job needs a motion sensor? (a) switch on with a clap (b) keep an incubator warm (c) open blinds at sunrise (d) spot someone walking in
7. 7.Which job needs a temperature sensor? (a) close a window in rain (b) open blinds at sunrise (c) keep an incubator warm (d) spot someone walking in
8. 8.Which job needs a rain sensor? (a) start a fan when hot (b) make a parking alarm (c) close a window in rain (d) switch on lamps at dusk
9. 9.🔍 A distance sensor sends a sound pulse and hears the echo 7 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
10. 10.Which job needs a buzzer? (a) turn to an exact angle (b) beep an alarm (c) move water to plants (d) open a gate to 90°
11. 11.🔍 Which sensor would you use to spot someone walking in? (a) a motion sensor (b) a distance sensor (c) a temperature sensor (d) a light sensor
12. 12.🔍 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)?
13. 13.🔍 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?
14. 14.True or false: to close a window in rain, use a sound sensor. (a) True (b) False
15. 15.🔍 Which sensor would you use to start a fan when hot? (a) a soil moisture sensor (b) a temperature sensor (c) a light sensor (d) a sound sensor
16. 16.🔍 Which sensor would you use to open blinds at sunrise? (a) a soil moisture sensor (b) a gas sensor (c) a distance sensor (d) a light sensor
17. 17.⚙️ Which actuator would you use to show the temperature? (a) a pump (b) an LED (c) a servo motor (d) a display
18. 18.True or false: to keep an incubator warm, use a temperature sensor. (a) False (b) True
19. 19.Which job needs a distance sensor? (a) stop a robot near walls (b) close a window in rain (c) switch on with a clap (d) start a fan when hot
20. 20.⚙️ Which actuator would you use to spin a robot’s wheels? (a) a buzzer (b) a servo motor (c) a display (d) a motor
21. 21.🔍 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?
22. 22.⚙️ What is an actuator? (a) a battery (b) a sensor (c) an output that acts (d) a program
23. 23.🔍 For a microcontroller, is a sensor an input or an output? (a) a power source (b) an input (c) an output (d) a fuse
24. 24.🔍 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)?
25. 25.⚙️ Which actuator would you use to show a status light? (a) a servo motor (b) a buzzer (c) an LED (d) a display
26. 26.True or false: to switch on with a clap, use a motion sensor. (a) True (b) False
27. 27.True or false: to stop a robot near walls, use a gas sensor. (a) False (b) True
28. 28.Which job needs a display? (a) show the temperature (b) spin a robot’s wheels (c) move water to plants (d) show a status light
29. 29.Which job needs a temperature sensor? (a) warn of a gas leak (b) switch on with a clap (c) start a fan when hot (d) water a dry plant
30. 30.True or false: to warn of a gas leak, use a gas sensor. (a) False (b) True
31. 31.🔍 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)?
32. 32.True or false: to spot someone walking in, use a motion sensor. (a) True (b) False
33. 33.⚙️ Which actuator would you use to open a gate to 90°? (a) a buzzer (b) a motor (c) a servo motor (d) an LED
34. 34.True or false: to make a parking alarm, use a rain sensor. (a) True (b) False
35. 35.🔍 Which sensor would you use to switch on with a clap? (a) a distance sensor (b) a motion sensor (c) a rain sensor (d) a sound sensor
36. 36.True or false: to spot someone walking in, use a gas sensor. (a) False (b) True
37. 37.True or false: to switch on lamps at dusk, use a light sensor. (a) True (b) False
38. 38.🔍 An object is 204 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
39. 39.⚙️ Which actuator would you use to move water to plants? (a) a motor (b) an LED (c) a servo motor (d) a pump
40. 40.🔍 An object is 17 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?

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