Electronics Worksheet: Sensors and Actuators

Electronics lesson 26: Sensors and actuators · Set 239 · 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.🔍 A distance sensor sends a sound pulse and hears the echo 18 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
2. 2.⚙️ Which actuator would you use to show a status light? (a) an LED (b) a buzzer (c) a servo motor (d) a pump
3. 3.⚙️ Which actuator would you use to beep an alarm? (a) an LED (b) a pump (c) a display (d) a buzzer
4. 4.Which job needs a temperature sensor? (a) spot someone walking in (b) switch on with a clap (c) start a fan when hot (d) close a window in rain
5. 5.True or false: to start a fan when hot, use a temperature sensor. (a) True (b) False
6. 6.🔍 Which sensor would you use to warn of a gas leak? (a) a gas sensor (b) a soil moisture sensor (c) a motion sensor (d) a rain sensor
7. 7.🔍 Which sensor would you use to stop a robot near walls? (a) a motion sensor (b) a gas sensor (c) a distance sensor (d) a sound sensor
8. 8.Which job needs an LED? (a) show the temperature (b) beep an alarm (c) show a status light (d) move water to plants
9. 9.🔍 Which sensor would you use to make a parking alarm? (a) a distance sensor (b) a sound sensor (c) a soil moisture sensor (d) a light sensor
10. 10.Which job needs a servo motor? (a) show the temperature (b) spin a robot’s wheels (c) beep an alarm (d) turn to an exact angle
11. 11.⚙️ Which actuator would you use to open a gate to 90°? (a) an LED (b) a display (c) a servo motor (d) a buzzer
12. 12.🔍 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)?
13. 13.⚙️ What is an actuator? (a) a battery (b) a sensor (c) an output that acts (d) a program
14. 14.Which job needs a pump? (a) turn to an exact angle (b) spin a robot’s wheels (c) show the temperature (d) move water to plants
15. 15.🔍 An object is 238 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
16. 16.⚙️ Which actuator would you use to show the temperature? (a) a motor (b) a display (c) a buzzer (d) a servo motor
17. 17.True or false: to close a window in rain, use a motion sensor. (a) False (b) True
18. 18.🔍 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?
19. 19.Which job needs a gas sensor? (a) spot someone walking in (b) start a fan when hot (c) stop a robot near walls (d) warn of a gas leak
20. 20.⚙️ Which actuator would you use to spin a robot’s wheels? (a) a buzzer (b) a servo motor (c) a motor (d) a display
21. 21.🔍 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?
22. 22.Which job needs a motion sensor? (a) stop a robot near walls (b) open blinds at sunrise (c) spot someone walking in (d) start a fan when hot
23. 23.Which job needs a servo motor? (a) move water to plants (b) show a status light (c) open a gate to 90° (d) show the temperature
24. 24.🔍 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?
25. 25.🔍 For a microcontroller, is a sensor an input or an output? (a) an output (b) a fuse (c) an input (d) a power source
26. 26.Which job needs a buzzer? (a) spin a robot’s wheels (b) beep an alarm (c) show the temperature (d) turn to an exact angle
27. 27.Which job needs a distance sensor? (a) measure classroom noise (b) spot someone walking in (c) switch on with a clap (d) make a parking alarm
28. 28.Which job needs a light sensor? (a) water a dry plant (b) start a fan when hot (c) switch on lamps at dusk (d) make a parking alarm
29. 29.🔍 Which sensor would you use to open blinds at sunrise? (a) a rain sensor (b) a sound sensor (c) a soil moisture sensor (d) a light sensor
30. 30.🔍 Which sensor would you use to switch on lamps at dusk? (a) a light sensor (b) a temperature sensor (c) a soil moisture sensor (d) a gas sensor
31. 31.⚙️ Which actuator would you use to move water to plants? (a) a pump (b) a servo motor (c) a display (d) a buzzer
32. 32.True or false: to water a dry plant, use a sound sensor. (a) True (b) False
33. 33.Which job needs a rain sensor? (a) keep an incubator warm (b) close a window in rain (c) switch on with a clap (d) warn of a gas leak
34. 34.Which job needs a sound sensor? (a) switch on with a clap (b) open blinds at sunrise (c) spot someone walking in (d) switch on lamps at dusk
35. 35.Which job needs a sound sensor? (a) warn of a gas leak (b) measure classroom noise (c) start a fan when hot (d) keep an incubator warm
36. 36.🔍 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)?
37. 37.True or false: to start a fan when hot, use a light sensor. (a) False (b) True
38. 38.🔍 An object is 170 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
39. 39.🔍 Which sensor would you use to keep an incubator warm? (a) a temperature sensor (b) a motion sensor (c) a rain sensor (d) a sound sensor
40. 40.Which job needs a soil moisture sensor? (a) switch on lamps at dusk (b) warn of a gas leak (c) start a fan when hot (d) water a dry plant

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