Electronics Worksheet: Sensors and Actuators

Electronics lesson 26: Sensors and actuators · Set 147 · 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 actuator would you use to show a status light? (a) a display (b) a pump (c) a motor (d) an LED
2. 2.True or false: to keep an incubator warm, use a temperature sensor. (a) True (b) False
3. 3.Which job needs a soil moisture sensor? (a) switch on with a clap (b) open blinds at sunrise (c) make a parking alarm (d) water a dry plant
4. 4.Which job needs a servo motor? (a) open a gate to 90° (b) show the temperature (c) beep an alarm (d) move water to plants
5. 5.⚙️ Which actuator would you use to spin a robot’s wheels? (a) a motor (b) an LED (c) a pump (d) a buzzer
6. 6.Which job needs an LED? (a) show a status light (b) beep an alarm (c) turn to an exact angle (d) move water to plants
7. 7.⚙️ Which actuator would you use to move water to plants? (a) a servo motor (b) a pump (c) a display (d) a motor
8. 8.🔍 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)?
9. 9.True or false: to close a window in rain, use a temperature sensor. (a) False (b) True
10. 10.True or false: to close a window in rain, use a gas sensor. (a) True (b) False
11. 11.True or false: to keep an incubator warm, use a distance sensor. (a) True (b) False
12. 12.Which job needs a light sensor? (a) stop a robot near walls (b) switch on lamps at dusk (c) switch on with a clap (d) warn of a gas leak
13. 13.⚙️ What is an actuator? (a) a program (b) a battery (c) a sensor (d) an output that acts
14. 14.Which job needs a light sensor? (a) measure classroom noise (b) water a dry plant (c) open blinds at sunrise (d) make a parking alarm
15. 15.🔍 An object is 153 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
16. 16.True or false: to warn of a gas leak, use a gas sensor. (a) True (b) False
17. 17.🔍 For a microcontroller, is a sensor an input or an output? (a) a power source (b) an output (c) a fuse (d) an input
18. 18.⚙️ Which actuator would you use to beep an alarm? (a) a buzzer (b) a motor (c) a display (d) a pump
19. 19.⚙️ Which actuator would you use to turn to an exact angle? (a) a servo motor (b) a display (c) a motor (d) an LED
20. 20.🔍 Which sensor would you use to spot someone walking in? (a) a distance sensor (b) a motion sensor (c) a light sensor (d) a soil moisture sensor
21. 21.True or false: to make a parking alarm, use a soil moisture sensor. (a) False (b) True
22. 22.Which job needs a motion sensor? (a) warn of a gas leak (b) open blinds at sunrise (c) measure classroom noise (d) spot someone walking in
23. 23.True or false: to switch on lamps at dusk, use a gas sensor. (a) False (b) True
24. 24.Which job needs a temperature sensor? (a) close a window in rain (b) warn of a gas leak (c) keep an incubator warm (d) switch on lamps at dusk
25. 25.Which job needs a motor? (a) turn to an exact angle (b) beep an alarm (c) move water to plants (d) spin a robot’s wheels
26. 26.🔍 Which sensor would you use to make a parking alarm? (a) a soil moisture sensor (b) a light sensor (c) a distance sensor (d) a rain sensor
27. 27.🔍 Which sensor would you use to open blinds at sunrise? (a) a light sensor (b) a sound sensor (c) a rain sensor (d) a gas sensor
28. 28.True or false: to open blinds at sunrise, use a light sensor. (a) True (b) False
29. 29.🔍 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?
30. 30.Which job needs a buzzer? (a) spin a robot’s wheels (b) open a gate to 90° (c) beep an alarm (d) show the temperature
31. 31.Which job needs a pump? (a) move water to plants (b) spin a robot’s wheels (c) show a status light (d) open a gate to 90°
32. 32.🔍 Which sensor would you use to water a dry plant? (a) a distance sensor (b) a soil moisture sensor (c) a light sensor (d) a sound sensor
33. 33.True or false: to water a dry plant, use a gas sensor. (a) True (b) False
34. 34.🔍 Which sensor would you use to switch on lamps at dusk? (a) a motion sensor (b) a distance sensor (c) a light sensor (d) a gas sensor
35. 35.🔍 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)?
36. 36.True or false: to spot someone walking in, use a light sensor. (a) False (b) True
37. 37.True or false: to keep an incubator warm, use a motion sensor. (a) True (b) False
38. 38.🔍 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?
39. 39.Which job needs a rain sensor? (a) warn of a gas leak (b) open blinds at sunrise (c) make a parking alarm (d) close a window in rain
40. 40.🔍 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?

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