Electronics Worksheet: Sensors and Actuators

Electronics lesson 26: Sensors and actuators · Set 340 · 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) a sensor (d) an output that acts
2. 2.Which job needs a distance sensor? (a) switch on with a clap (b) warn of a gas leak (c) open blinds at sunrise (d) stop a robot near walls
3. 3.⚙️ Which actuator would you use to beep an alarm? (a) a buzzer (b) a display (c) a pump (d) a motor
4. 4.True or false: to warn of a gas leak, use a gas sensor. (a) True (b) False
5. 5.Which job needs a gas sensor? (a) open blinds at sunrise (b) start a fan when hot (c) warn of a gas leak (d) switch on with a clap
6. 6.🔍 Which sensor would you use to spot someone walking in? (a) a motion sensor (b) a rain sensor (c) a distance sensor (d) a light sensor
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 job needs a temperature sensor? (a) make a parking alarm (b) measure classroom noise (c) switch on lamps at dusk (d) start a fan when hot
9. 9.🔍 Which sensor would you use to keep an incubator warm? (a) a rain sensor (b) a motion sensor (c) a gas sensor (d) a temperature sensor
10. 10.🔍 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)?
11. 11.🔍 Which sensor would you use to make a parking alarm? (a) a sound sensor (b) a soil moisture sensor (c) a distance sensor (d) a light sensor
12. 12.Which job needs a light sensor? (a) close a window in rain (b) spot someone walking in (c) open blinds at sunrise (d) keep an incubator warm
13. 13.🔍 Which sensor would you use to water a dry plant? (a) a light sensor (b) a gas sensor (c) a temperature sensor (d) a soil moisture sensor
14. 14.Which job needs a motor? (a) show a status light (b) beep an alarm (c) move water to plants (d) spin a robot’s wheels
15. 15.🔍 An object is 221 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
16. 16.Which job needs an LED? (a) turn to an exact angle (b) beep an alarm (c) show a status light (d) move water to plants
17. 17.True or false: to keep an incubator warm, use a temperature sensor. (a) False (b) True
18. 18.Which job needs a light sensor? (a) close a window in rain (b) keep an incubator warm (c) switch on lamps at dusk (d) warn of a gas leak
19. 19.🔍 For a microcontroller, is a sensor an input or an output? (a) a power source (b) an input (c) a fuse (d) an output
20. 20.🔍 Which sensor would you use to close a window in rain? (a) a rain sensor (b) a soil moisture sensor (c) a motion sensor (d) a light sensor
21. 21.Which job needs a sound sensor? (a) start a fan when hot (b) keep an incubator warm (c) switch on lamps at dusk (d) switch on with a clap
22. 22.True or false: to start a fan when hot, use a motion sensor. (a) False (b) True
23. 23.Which job needs a servo motor? (a) beep an alarm (b) move water to plants (c) show a status light (d) open a gate to 90°
24. 24.🔍 Which sensor would you use to open blinds at sunrise? (a) a light sensor (b) a sound sensor (c) a soil moisture sensor (d) a rain sensor
25. 25.⚙️ Which actuator would you use to open a gate to 90°? (a) a pump (b) a servo motor (c) an LED (d) a motor
26. 26.Which job needs a buzzer? (a) open a gate to 90° (b) show a status light (c) beep an alarm (d) show the temperature
27. 27.🔍 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)?
28. 28.🔍 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?
29. 29.Which job needs a temperature sensor? (a) water a dry plant (b) switch on with a clap (c) switch on lamps at dusk (d) keep an incubator warm
30. 30.Which job needs a rain sensor? (a) warn of a gas leak (b) switch on with a clap (c) close a window in rain (d) spot someone walking in
31. 31.⚙️ Which actuator would you use to show the temperature? (a) a display (b) a pump (c) an LED (d) a motor
32. 32.True or false: to switch on with a clap, use a sound sensor. (a) True (b) False
33. 33.True or false: to switch on lamps at dusk, use a light sensor. (a) False (b) True
34. 34.Which job needs a display? (a) turn to an exact angle (b) open a gate to 90° (c) move water to plants (d) show the temperature
35. 35.🔍 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?
36. 36.🔍 A distance sensor sends a sound pulse and hears the echo 1 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
37. 37.🔍 An object is 136 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
38. 38.⚙️ Which actuator would you use to turn to an exact angle? (a) a servo motor (b) a motor (c) an LED (d) a display
39. 39.True or false: to switch on lamps at dusk, use a distance sensor. (a) False (b) True
40. 40.🔍 Which sensor would you use to switch on lamps at dusk? (a) a light sensor (b) a gas sensor (c) a temperature sensor (d) a soil moisture sensor

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