Electronics Worksheet: Sensors and Actuators

Electronics lesson 26: Sensors and actuators · Set 249 · 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 distance sensor? (a) make a parking alarm (b) start a fan when hot (c) close a window in rain (d) switch on lamps at dusk
2. 2.🔍 For a microcontroller, is a sensor an input or an output? (a) an input (b) an output (c) a fuse (d) a power source
3. 3.Which job needs a buzzer? (a) turn to an exact angle (b) spin a robot’s wheels (c) beep an alarm (d) open a gate to 90°
4. 4.Which job needs a light sensor? (a) stop a robot near walls (b) close a window in rain (c) switch on lamps at dusk (d) make a parking alarm
5. 5.⚙️ Which actuator would you use to beep an alarm? (a) a pump (b) a servo motor (c) a buzzer (d) a motor
6. 6.Which job needs a temperature sensor? (a) water a dry plant (b) switch on lamps at dusk (c) start a fan when hot (d) make a parking alarm
7. 7.⚙️ What is an actuator? (a) an output that acts (b) a sensor (c) a battery (d) a program
8. 8.Which job needs a sound sensor? (a) switch on lamps at dusk (b) water a dry plant (c) stop a robot near walls (d) switch on with a clap
9. 9.True or false: to water a dry plant, use a soil moisture sensor. (a) False (b) True
10. 10.⚙️ Which actuator would you use to spin a robot’s wheels? (a) an LED (b) a pump (c) a motor (d) a display
11. 11.True or false: to start a fan when hot, use a gas sensor. (a) False (b) True
12. 12.Which job needs a motor? (a) turn to an exact angle (b) show a status light (c) beep an alarm (d) spin a robot’s wheels
13. 13.🔍 Which sensor would you use to water a dry plant? (a) a soil moisture sensor (b) a light sensor (c) a gas sensor (d) a rain sensor
14. 14.Which job needs a light sensor? (a) stop a robot near walls (b) open blinds at sunrise (c) keep an incubator warm (d) water a dry plant
15. 15.🔍 Which sensor would you use to close a window in rain? (a) a soil moisture sensor (b) a temperature sensor (c) a rain sensor (d) a sound sensor
16. 16.🔍 Which sensor would you use to switch on with a clap? (a) a gas sensor (b) a soil moisture sensor (c) a temperature sensor (d) a sound sensor
17. 17.⚙️ Which actuator would you use to show a status light? (a) a motor (b) a display (c) a buzzer (d) an LED
18. 18.🔍 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?
19. 19.Which job needs a gas sensor? (a) measure classroom noise (b) stop a robot near walls (c) water a dry plant (d) warn of a gas leak
20. 20.True or false: to warn of a gas leak, use a gas sensor. (a) False (b) True
21. 21.⚙️ Which actuator would you use to open a gate to 90°? (a) a motor (b) a buzzer (c) a pump (d) a servo motor
22. 22.🔍 An object is 119 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
23. 23.🔍 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)?
24. 24.Which job needs a rain sensor? (a) switch on with a clap (b) keep an incubator warm (c) close a window in rain (d) warn of a gas leak
25. 25.Which job needs a servo motor? (a) turn to an exact angle (b) move water to plants (c) spin a robot’s wheels (d) show the temperature
26. 26.Which job needs an LED? (a) move water to plants (b) show a status light (c) turn to an exact angle (d) open a gate to 90°
27. 27.🔍 Which sensor would you use to switch on lamps at dusk? (a) a rain sensor (b) a sound sensor (c) a temperature sensor (d) a light sensor
28. 28.True or false: to switch on with a clap, use a sound sensor. (a) False (b) True
29. 29.🔍 A distance sensor sends a sound pulse and hears the echo 9 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
30. 30.⚙️ Which actuator would you use to move water to plants? (a) a buzzer (b) a pump (c) a motor (d) an LED
31. 31.⚙️ Which actuator would you use to show the temperature? (a) a display (b) a servo motor (c) a pump (d) an LED
32. 32.🔍 An object is 102 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 close a window in rain, use a rain sensor. (a) False (b) True
34. 34.🔍 Which sensor would you use to warn of a gas leak? (a) a soil moisture sensor (b) a temperature sensor (c) a light sensor (d) a gas sensor
35. 35.True or false: to spot someone walking in, use a sound sensor. (a) True (b) False
36. 36.True or false: to switch on lamps at dusk, use a sound sensor. (a) True (b) False
37. 37.⚙️ Which actuator would you use to turn to an exact angle? (a) a motor (b) a servo motor (c) an LED (d) a pump
38. 38.🔍 Which sensor would you use to spot someone walking in? (a) a motion sensor (b) a light sensor (c) a distance sensor (d) a temperature sensor
39. 39.🔍 Which sensor would you use to start a fan when hot? (a) a sound sensor (b) a soil moisture sensor (c) a temperature sensor (d) a motion sensor
40. 40.Which job needs a servo motor? (a) open a gate to 90° (b) beep an alarm (c) show a status light (d) spin a robot’s wheels

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