Electronics Worksheet: Sensors and Actuators

Electronics lesson 26: Sensors and actuators · Set 137 · 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 pump? (a) spin a robot’s wheels (b) move water to plants (c) show the temperature (d) show a status light
2. 2.True or false: to make a parking alarm, use a temperature sensor. (a) True (b) False
3. 3.🔍 Which sensor would you use to keep an incubator warm? (a) a distance sensor (b) a temperature sensor (c) a gas sensor (d) a sound sensor
4. 4.⚙️ Which actuator would you use to beep an alarm? (a) an LED (b) a buzzer (c) a servo motor (d) a pump
5. 5.True or false: to make a parking alarm, use a light sensor. (a) False (b) True
6. 6.🔍 Which sensor would you use to water a dry plant? (a) a distance sensor (b) a soil moisture sensor (c) a motion sensor (d) a gas sensor
7. 7.Which job needs an LED? (a) show a status light (b) move water to plants (c) open a gate to 90° (d) show the temperature
8. 8.Which job needs a display? (a) spin a robot’s wheels (b) show the temperature (c) open a gate to 90° (d) turn to an exact angle
9. 9.Which job needs a distance sensor? (a) water a dry plant (b) switch on with a clap (c) open blinds at sunrise (d) make a parking alarm
10. 10.🔍 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)?
11. 11.⚙️ Which actuator would you use to show a status light? (a) a pump (b) a display (c) an LED (d) a buzzer
12. 12.🔍 Which sensor would you use to make a parking alarm? (a) a distance sensor (b) a rain sensor (c) a light sensor (d) a motion sensor
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.🔍 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)?
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.🔍 For a microcontroller, is a sensor an input or an output? (a) an input (b) an output (c) a power source (d) a fuse
17. 17.True or false: to switch on lamps at dusk, use a light sensor. (a) False (b) True
18. 18.🔍 A distance sensor sends a sound pulse and hears the echo 10 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
19. 19.Which job needs a motor? (a) beep an alarm (b) open a gate to 90° (c) spin a robot’s wheels (d) turn to an exact angle
20. 20.🔍 Which sensor would you use to switch on with a clap? (a) a distance sensor (b) a motion sensor (c) a gas sensor (d) a sound sensor
21. 21.🔍 Which sensor would you use to switch on lamps at dusk? (a) a rain sensor (b) a temperature sensor (c) a light sensor (d) a sound sensor
22. 22.⚙️ What is an actuator? (a) an output that acts (b) a program (c) a sensor (d) a battery
23. 23.Which job needs a temperature sensor? (a) water a dry plant (b) start a fan when hot (c) make a parking alarm (d) open blinds at sunrise
24. 24.🔍 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?
25. 25.⚙️ Which actuator would you use to spin a robot’s wheels? (a) a buzzer (b) a motor (c) a servo motor (d) an LED
26. 26.🔍 Which sensor would you use to stop a robot near walls? (a) a motion sensor (b) a distance sensor (c) a gas sensor (d) a temperature sensor
27. 27.🔍 Which sensor would you use to warn of a gas leak? (a) a light sensor (b) a rain sensor (c) a motion sensor (d) a gas sensor
28. 28.🔍 An object is 51 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) spot someone walking in (b) switch on with a clap (c) stop a robot near walls (d) keep an incubator warm
30. 30.True or false: to start a fan when hot, use a temperature sensor. (a) False (b) True
31. 31.Which job needs a motion sensor? (a) stop a robot near walls (b) warn of a gas leak (c) spot someone walking in (d) close a window in rain
32. 32.🔍 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?
33. 33.🔍 A distance sensor sends a sound pulse and hears the echo 2 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
34. 34.🔍 Which sensor would you use to close a window in rain? (a) a distance sensor (b) a sound sensor (c) a light sensor (d) a rain sensor
35. 35.Which job needs a buzzer? (a) beep an alarm (b) spin a robot’s wheels (c) move water to plants (d) turn to an exact angle
36. 36.Which job needs a gas sensor? (a) open blinds at sunrise (b) switch on lamps at dusk (c) start a fan when hot (d) warn of a gas leak
37. 37.🔍 Which sensor would you use to spot someone walking in? (a) a motion sensor (b) a gas sensor (c) a temperature sensor (d) a rain sensor
38. 38.True or false: to stop a robot near walls, use a sound sensor. (a) True (b) False
39. 39.⚙️ Which actuator would you use to show the temperature? (a) an LED (b) a display (c) a pump (d) a servo motor
40. 40.Which job needs a sound sensor? (a) make a parking alarm (b) keep an incubator warm (c) switch on with a clap (d) close a window in rain

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