Electronics Worksheet: Sensors and Actuators

Electronics lesson 26: Sensors and actuators · Set 298 · 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 buzzer? (a) show a status light (b) beep an alarm (c) turn to an exact angle (d) spin a robot’s wheels
2. 2.True or false: to warn of a gas leak, use a light sensor. (a) True (b) False
3. 3.Which job needs a pump? (a) move water to plants (b) spin a robot’s wheels (c) open a gate to 90° (d) show the temperature
4. 4.🔍 For a microcontroller, is a sensor an input or an output? (a) an input (b) a power source (c) an output (d) a fuse
5. 5.🔍 Which sensor would you use to switch on with a clap? (a) a distance sensor (b) a sound sensor (c) a light sensor (d) a gas sensor
6. 6.Which job needs a gas sensor? (a) water a dry plant (b) warn of a gas leak (c) switch on with a clap (d) open blinds at sunrise
7. 7.Which job needs a temperature sensor? (a) make a parking alarm (b) start a fan when hot (c) switch on with a clap (d) stop a robot near walls
8. 8.Which job needs a distance sensor? (a) start a fan when hot (b) water a dry plant (c) make a parking alarm (d) spot someone walking in
9. 9.Which job needs a servo motor? (a) open a gate to 90° (b) spin a robot’s wheels (c) show the temperature (d) show a status light
10. 10.🔍 Which sensor would you use to make a parking alarm? (a) a soil moisture sensor (b) a light sensor (c) a temperature sensor (d) a distance sensor
11. 11.Which job needs a motion sensor? (a) stop a robot near walls (b) switch on lamps at dusk (c) spot someone walking in (d) start a fan when hot
12. 12.🔍 Which sensor would you use to stop a robot near walls? (a) a motion sensor (b) a distance sensor (c) a light sensor (d) a temperature sensor
13. 13.True or false: to close a window in rain, use a motion sensor. (a) True (b) False
14. 14.⚙️ What is an actuator? (a) an output that acts (b) a battery (c) a program (d) a sensor
15. 15.🔍 Which sensor would you use to start a fan when hot? (a) a distance sensor (b) a gas sensor (c) a sound sensor (d) a temperature sensor
16. 16.🔍 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?
17. 17.🔍 Which sensor would you use to switch on lamps at dusk? (a) a sound sensor (b) a light sensor (c) a distance sensor (d) a temperature sensor
18. 18.⚙️ Which actuator would you use to turn to an exact angle? (a) a display (b) a pump (c) a servo motor (d) a motor
19. 19.⚙️ Which actuator would you use to show a status light? (a) a servo motor (b) a motor (c) an LED (d) a buzzer
20. 20.🔍 Which sensor would you use to warn of a gas leak? (a) a distance sensor (b) a gas sensor (c) a motion sensor (d) a rain sensor
21. 21.🔍 Which sensor would you use to open blinds at sunrise? (a) a rain sensor (b) a light sensor (c) a soil moisture sensor (d) a temperature sensor
22. 22.🔍 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)?
23. 23.🔍 A distance sensor sends a sound pulse and hears the echo 12 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
24. 24.🔍 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?
25. 25.Which job needs an LED? (a) open a gate to 90° (b) show a status light (c) turn to an exact angle (d) show the temperature
26. 26.🔍 An object is 272 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
27. 27.Which job needs a servo motor? (a) beep an alarm (b) show a status light (c) move water to plants (d) turn to an exact angle
28. 28.Which job needs a rain sensor? (a) close a window in rain (b) spot someone walking in (c) make a parking alarm (d) stop a robot near walls
29. 29.🔍 A distance sensor sends a sound pulse and hears the echo 3 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
30. 30.🔍 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)?
31. 31.True or false: to make a parking alarm, use a distance sensor. (a) False (b) True
32. 32.🔍 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)?
33. 33.🔍 Which sensor would you use to spot someone walking in? (a) a gas sensor (b) a rain sensor (c) a motion sensor (d) a soil moisture sensor
34. 34.Which job needs a light sensor? (a) switch on with a clap (b) open blinds at sunrise (c) water a dry plant (d) spot someone walking in
35. 35.🔍 Which sensor would you use to close a window in rain? (a) a rain sensor (b) a temperature sensor (c) a gas sensor (d) a sound sensor
36. 36.🔍 A distance sensor sends a sound pulse and hears the echo 14 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
37. 37.True or false: to warn of a gas leak, use a gas sensor. (a) True (b) False
38. 38.True or false: to close a window in rain, use a gas sensor. (a) True (b) False
39. 39.🔍 A distance sensor sends a sound pulse and hears the echo 8 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
40. 40.🔍 Which sensor would you use to water a dry plant? (a) a gas sensor (b) a sound sensor (c) a rain sensor (d) a soil moisture sensor

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