Electronics Worksheet: Sensors and Actuators

Electronics lesson 26: Sensors and actuators · Set 348 · 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.⚙️ What is an actuator? (a) a battery (b) a program (c) a sensor (d) an output that acts
2. 2.Which job needs a rain sensor? (a) close a window in rain (b) switch on with a clap (c) make a parking alarm (d) spot someone walking in
3. 3.🔍 For a microcontroller, is a sensor an input or an output? (a) an input (b) a fuse (c) a power source (d) an output
4. 4.True or false: to switch on with a clap, use a sound sensor. (a) False (b) True
5. 5.🔍 An object is 340 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
6. 6.Which job needs a gas sensor? (a) spot someone walking in (b) warn of a gas leak (c) make a parking alarm (d) water a dry plant
7. 7.Which job needs a distance sensor? (a) close a window in rain (b) open blinds at sunrise (c) switch on lamps at dusk (d) stop a robot near walls
8. 8.🔍 Which sensor would you use to warn of a gas leak? (a) a temperature sensor (b) a distance sensor (c) a gas sensor (d) a light sensor
9. 9.Which job needs a motor? (a) turn to an exact angle (b) spin a robot’s wheels (c) open a gate to 90° (d) beep an alarm
10. 10.Which job needs a display? (a) move water to plants (b) show the temperature (c) spin a robot’s wheels (d) open a gate to 90°
11. 11.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
12. 12.⚙️ Which actuator would you use to move water to plants? (a) an LED (b) a display (c) a pump (d) a buzzer
13. 13.⚙️ Which actuator would you use to show the temperature? (a) a display (b) a pump (c) a motor (d) a buzzer
14. 14.True or false: to switch on lamps at dusk, use a sound sensor. (a) False (b) True
15. 15.🔍 Which sensor would you use to spot someone walking in? (a) a motion sensor (b) a sound sensor (c) a temperature sensor (d) a light sensor
16. 16.🔍 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)?
17. 17.Which job needs a servo motor? (a) beep an alarm (b) spin a robot’s wheels (c) show a status light (d) turn to an exact angle
18. 18.Which job needs a motion sensor? (a) spot someone walking in (b) switch on with a clap (c) water a dry plant (d) open blinds at sunrise
19. 19.🔍 A distance sensor sends a sound pulse and hears the echo 7 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
20. 20.🔍 Which sensor would you use to start a fan when hot? (a) a distance sensor (b) a light sensor (c) a gas sensor (d) a temperature sensor
21. 21.Which job needs a buzzer? (a) spin a robot’s wheels (b) beep an alarm (c) open a gate to 90° (d) move water to plants
22. 22.Which job needs a sound sensor? (a) keep an incubator warm (b) switch on lamps at dusk (c) stop a robot near walls (d) measure classroom noise
23. 23.🔍 Which sensor would you use to open blinds at sunrise? (a) a motion sensor (b) a rain sensor (c) a light sensor (d) a gas sensor
24. 24.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
25. 25.True or false: to water a dry plant, use a distance sensor. (a) False (b) True
26. 26.🔍 Which sensor would you use to switch on with a clap? (a) a gas sensor (b) a sound sensor (c) a motion sensor (d) a rain sensor
27. 27.⚙️ Which actuator would you use to show a status light? (a) a motor (b) a pump (c) an LED (d) a buzzer
28. 28.🔍 Which sensor would you use to close a window in rain? (a) a rain sensor (b) a motion sensor (c) a sound sensor (d) a soil moisture sensor
29. 29.True or false: to close a window in rain, use a light sensor. (a) True (b) False
30. 30.True or false: to switch on lamps at dusk, use a rain sensor. (a) False (b) True
31. 31.⚙️ Which actuator would you use to beep an alarm? (a) a display (b) a buzzer (c) a pump (d) a motor
32. 32.🔍 Which sensor would you use to stop a robot near walls? (a) a temperature sensor (b) a gas sensor (c) a distance sensor (d) a sound sensor
33. 33.Which job needs a distance sensor? (a) start a fan when hot (b) keep an incubator warm (c) make a parking alarm (d) warn of a gas leak
34. 34.Which job needs a pump? (a) spin a robot’s wheels (b) open a gate to 90° (c) beep an alarm (d) move water to plants
35. 35.True or false: to make a parking alarm, use a distance sensor. (a) True (b) False
36. 36.True or false: to close a window in rain, use a rain sensor. (a) False (b) True
37. 37.🔍 Which sensor would you use to measure classroom noise? (a) a soil moisture sensor (b) a light sensor (c) a gas sensor (d) a sound sensor
38. 38.⚙️ Which actuator would you use to open a gate to 90°? (a) a motor (b) a servo motor (c) a pump (d) a buzzer
39. 39.🔍 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)?
40. 40.True or false: to warn of a gas leak, use a soil moisture sensor. (a) True (b) False

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