Electronics Worksheet: Sensors and Actuators

Electronics lesson 26: Sensors and actuators · Set 244 · 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 sensor would you use to switch on with a clap? (a) a light sensor (b) a rain sensor (c) a sound sensor (d) a soil moisture sensor
2. 2.⚙️ What is an actuator? (a) an output that acts (b) a sensor (c) a program (d) a battery
3. 3.🔍 Which sensor would you use to open blinds at sunrise? (a) a motion sensor (b) a rain sensor (c) a distance sensor (d) a light sensor
4. 4.🔍 Which sensor would you use to water a dry plant? (a) a distance sensor (b) a light sensor (c) a temperature sensor (d) a soil moisture sensor
5. 5.Which job needs a light sensor? (a) stop a robot near walls (b) switch on lamps at dusk (c) warn of a gas leak (d) start a fan when hot
6. 6.Which job needs a temperature sensor? (a) make a parking alarm (b) spot someone walking in (c) start a fan when hot (d) open blinds at sunrise
7. 7.Which job needs a sound sensor? (a) switch on with a clap (b) open blinds at sunrise (c) stop a robot near walls (d) switch on lamps at dusk
8. 8.🔍 Which sensor would you use to warn of a gas leak? (a) a distance sensor (b) a gas sensor (c) a soil moisture sensor (d) a light sensor
9. 9.🔍 A distance sensor sends a sound pulse and hears the echo 11 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
10. 10.🔍 Which sensor would you use to make a parking alarm? (a) a soil moisture sensor (b) a distance sensor (c) a light sensor (d) a temperature sensor
11. 11.🔍 Which sensor would you use to switch on lamps at dusk? (a) a sound sensor (b) a soil moisture sensor (c) a light sensor (d) a distance sensor
12. 12.⚙️ Which actuator would you use to move water to plants? (a) a buzzer (b) a pump (c) a servo motor (d) a motor
13. 13.Which job needs an LED? (a) show a status light (b) show the temperature (c) beep an alarm (d) turn to an exact angle
14. 14.🔍 Which sensor would you use to close a window in rain? (a) a rain sensor (b) a distance sensor (c) a sound sensor (d) a motion sensor
15. 15.Which job needs a pump? (a) move water to plants (b) turn to an exact angle (c) open a gate to 90° (d) show the temperature
16. 16.True or false: to switch on lamps at dusk, use a light sensor. (a) False (b) True
17. 17.⚙️ Which actuator would you use to open a gate to 90°? (a) a motor (b) an LED (c) a display (d) a servo motor
18. 18.Which job needs a motor? (a) turn to an exact angle (b) beep an alarm (c) spin a robot’s wheels (d) move water to plants
19. 19.Which job needs a soil moisture sensor? (a) keep an incubator warm (b) spot someone walking in (c) water a dry plant (d) measure classroom noise
20. 20.True or false: to make a parking alarm, use a temperature sensor. (a) True (b) False
21. 21.🔍 A distance sensor sends a sound pulse and hears the echo 18 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
22. 22.True or false: to switch on lamps at dusk, use a motion sensor. (a) True (b) False
23. 23.Which job needs a gas sensor? (a) warn of a gas leak (b) close a window in rain (c) make a parking alarm (d) start a fan when hot
24. 24.🔍 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?
25. 25.True or false: to water a dry plant, use a sound sensor. (a) False (b) True
26. 26.🔍 For a microcontroller, is a sensor an input or an output? (a) a power source (b) an output (c) a fuse (d) an input
27. 27.🔍 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?
28. 28.⚙️ Which actuator would you use to turn to an exact angle? (a) a servo motor (b) a pump (c) an LED (d) a motor
29. 29.True or false: to measure classroom noise, use a sound sensor. (a) True (b) False
30. 30.🔍 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)?
31. 31.Which job needs a display? (a) show a status light (b) show the temperature (c) open a gate to 90° (d) spin a robot’s wheels
32. 32.🔍 An object is 187 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
33. 33.True or false: to start a fan when hot, use a temperature sensor. (a) False (b) True
34. 34.Which job needs a motion sensor? (a) switch on with a clap (b) spot someone walking in (c) water a dry plant (d) switch on lamps at dusk
35. 35.🔍 Which sensor would you use to keep an incubator warm? (a) a temperature sensor (b) a gas sensor (c) a motion sensor (d) a sound sensor
36. 36.⚙️ Which actuator would you use to show a status light? (a) a pump (b) a motor (c) a servo motor (d) an LED
37. 37.True or false: to open blinds at sunrise, use a temperature sensor. (a) False (b) True
38. 38.🔍 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)?
39. 39.Which job needs a servo motor? (a) spin a robot’s wheels (b) show the temperature (c) show a status light (d) open a gate to 90°
40. 40.🔍 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?

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