Electronics Worksheet: Sensors and Actuators

Electronics lesson 26: Sensors and actuators · Set 317 · 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) show a status light (b) move water to plants (c) beep an alarm (d) spin a robot’s wheels
2. 2.Which job needs a buzzer? (a) show the temperature (b) spin a robot’s wheels (c) move water to plants (d) beep an alarm
3. 3.True or false: to stop a robot near walls, use a distance sensor. (a) True (b) False
4. 4.⚙️ What is an actuator? (a) a sensor (b) a battery (c) an output that acts (d) a program
5. 5.⚙️ Which actuator would you use to turn to an exact angle? (a) a buzzer (b) a servo motor (c) a pump (d) an LED
6. 6.🔍 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)?
7. 7.Which job needs a temperature sensor? (a) water a dry plant (b) start a fan when hot (c) stop a robot near walls (d) warn of a gas leak
8. 8.🔍 Which sensor would you use to spot someone walking in? (a) a distance sensor (b) a motion sensor (c) a light sensor (d) a rain sensor
9. 9.🔍 For a microcontroller, is a sensor an input or an output? (a) a power source (b) an input (c) a fuse (d) an output
10. 10.🔍 Which sensor would you use to measure classroom noise? (a) a sound sensor (b) a gas sensor (c) a rain sensor (d) a distance sensor
11. 11.🔍 Which sensor would you use to keep an incubator warm? (a) a motion sensor (b) a temperature sensor (c) a rain sensor (d) a gas sensor
12. 12.⚙️ Which actuator would you use to beep an alarm? (a) a display (b) a servo motor (c) a buzzer (d) an LED
13. 13.True or false: to close a window in rain, use a motion sensor. (a) False (b) True
14. 14.🔍 Which sensor would you use to warn of a gas leak? (a) a rain sensor (b) a light sensor (c) a gas sensor (d) a motion sensor
15. 15.True or false: to close a window in rain, use a rain sensor. (a) False (b) True
16. 16.True or false: to open blinds at sunrise, use a light sensor. (a) False (b) True
17. 17.🔍 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?
18. 18.Which job needs a distance sensor? (a) make a parking alarm (b) water a dry plant (c) switch on lamps at dusk (d) start a fan when hot
19. 19.🔍 Which sensor would you use to open blinds at sunrise? (a) a light sensor (b) a distance sensor (c) a motion sensor (d) a rain sensor
20. 20.True or false: to open blinds at sunrise, use a sound sensor. (a) True (b) False
21. 21.⚙️ Which actuator would you use to spin a robot’s wheels? (a) a pump (b) a motor (c) a display (d) an LED
22. 22.🔍 A distance sensor sends a sound pulse and hears the echo 17 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 16 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
24. 24.Which job needs a motion sensor? (a) start a fan when hot (b) warn of a gas leak (c) spot someone walking in (d) water a dry plant
25. 25.⚙️ Which actuator would you use to open a gate to 90°? (a) an LED (b) a motor (c) a display (d) a servo motor
26. 26.True or false: to spot someone walking in, use a motion sensor. (a) False (b) True
27. 27.Which job needs a light sensor? (a) stop a robot near walls (b) switch on with a clap (c) warn of a gas leak (d) open blinds at sunrise
28. 28.Which job needs an LED? (a) move water to plants (b) beep an alarm (c) turn to an exact angle (d) show a status light
29. 29.⚙️ Which actuator would you use to show a status light? (a) a motor (b) an LED (c) a servo motor (d) a display
30. 30.🔍 Which sensor would you use to switch on lamps at dusk? (a) a temperature sensor (b) a light sensor (c) a gas sensor (d) a distance sensor
31. 31.True or false: to stop a robot near walls, use a rain sensor. (a) True (b) False
32. 32.🔍 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)?
33. 33.Which job needs a servo motor? (a) show a status light (b) open a gate to 90° (c) beep an alarm (d) spin a robot’s wheels
34. 34.True or false: to water a dry plant, use a rain sensor. (a) True (b) False
35. 35.Which job needs a display? (a) spin a robot’s wheels (b) turn to an exact angle (c) show the temperature (d) beep an alarm
36. 36.True or false: to keep an incubator warm, use a sound sensor. (a) True (b) False
37. 37.Which job needs a light sensor? (a) close a window in rain (b) switch on lamps at dusk (c) warn of a gas leak (d) start a fan when hot
38. 38.Which job needs a distance sensor? (a) water a dry plant (b) switch on with a clap (c) stop a robot near walls (d) open blinds at sunrise
39. 39.🔍 Which sensor would you use to switch on with a clap? (a) a sound sensor (b) a motion sensor (c) a soil moisture sensor (d) a distance sensor
40. 40.Which job needs a servo motor? (a) move water to plants (b) show a status light (c) spin a robot’s wheels (d) turn to an exact angle

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