Electronics Worksheet: Sensors and Actuators

Electronics lesson 26: Sensors and actuators · Set 158 · 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 actuator would you use to beep an alarm? (a) a motor (b) a buzzer (c) an LED (d) a display
2. 2.Which job needs a distance sensor? (a) open blinds at sunrise (b) water a dry plant (c) make a parking alarm (d) switch on lamps at dusk
3. 3.🔍 Which sensor would you use to warn of a gas leak? (a) a rain sensor (b) a gas sensor (c) a distance sensor (d) a light sensor
4. 4.True or false: to warn of a gas leak, use a temperature sensor. (a) True (b) False
5. 5.True or false: to stop a robot near walls, use a distance sensor. (a) False (b) True
6. 6.Which job needs a sound sensor? (a) make a parking alarm (b) switch on lamps at dusk (c) start a fan when hot (d) switch on with a clap
7. 7.🔍 Which sensor would you use to water a dry plant? (a) a distance sensor (b) a light sensor (c) a rain sensor (d) a soil moisture sensor
8. 8.🔍 For a microcontroller, is a sensor an input or an output? (a) an output (b) a power source (c) an input (d) a fuse
9. 9.Which job needs a servo motor? (a) spin a robot’s wheels (b) move water to plants (c) show a status light (d) turn to an exact angle
10. 10.🔍 Which sensor would you use to open blinds at sunrise? (a) a motion sensor (b) a temperature sensor (c) a rain sensor (d) a light sensor
11. 11.🔍 Which sensor would you use to stop a robot near walls? (a) a light sensor (b) a soil moisture sensor (c) a distance sensor (d) a gas sensor
12. 12.🔍 An object is 323 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
13. 13.🔍 An object is 272 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
14. 14.Which job needs a motion sensor? (a) make a parking alarm (b) spot someone walking in (c) start a fan when hot (d) water a dry plant
15. 15.Which job needs an LED? (a) open a gate to 90° (b) spin a robot’s wheels (c) show a status light (d) move water to plants
16. 16.Which job needs a rain sensor? (a) keep an incubator warm (b) start a fan when hot (c) spot someone walking in (d) close a window in rain
17. 17.Which job needs a servo motor? (a) show a status light (b) spin a robot’s wheels (c) beep an alarm (d) open a gate to 90°
18. 18.Which job needs a sound sensor? (a) stop a robot near walls (b) water a dry plant (c) open blinds at sunrise (d) measure classroom noise
19. 19.🔍 Which sensor would you use to make a parking alarm? (a) a distance sensor (b) a gas sensor (c) a motion sensor (d) a light sensor
20. 20.Which job needs a soil moisture sensor? (a) stop a robot near walls (b) close a window in rain (c) water a dry plant (d) measure classroom noise
21. 21.⚙️ What is an actuator? (a) an output that acts (b) a battery (c) a program (d) a sensor
22. 22.Which job needs a pump? (a) move water to plants (b) turn to an exact angle (c) show a status light (d) beep an alarm
23. 23.⚙️ Which actuator would you use to spin a robot’s wheels? (a) a servo motor (b) an LED (c) a buzzer (d) a motor
24. 24.🔍 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)?
25. 25.Which job needs a motor? (a) open a gate to 90° (b) show the temperature (c) move water to plants (d) spin a robot’s wheels
26. 26.🔍 A distance sensor sends a sound pulse and hears the echo 11 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
27. 27.🔍 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)?
28. 28.⚙️ Which actuator would you use to open a gate to 90°? (a) an LED (b) a display (c) a servo motor (d) a buzzer
29. 29.True or false: to switch on lamps at dusk, use a temperature sensor. (a) False (b) True
30. 30.Which job needs a temperature sensor? (a) water a dry plant (b) stop a robot near walls (c) make a parking alarm (d) start a fan when hot
31. 31.🔍 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)?
32. 32.🔍 Which sensor would you use to switch on lamps at dusk? (a) a temperature sensor (b) a soil moisture sensor (c) a light sensor (d) a distance sensor
33. 33.⚙️ Which actuator would you use to show a status light? (a) a servo motor (b) a buzzer (c) an LED (d) a motor
34. 34.True or false: to start a fan when hot, use a distance sensor. (a) False (b) True
35. 35.True or false: to keep an incubator warm, use a temperature sensor. (a) True (b) False
36. 36.Which job needs a distance sensor? (a) close a window in rain (b) measure classroom noise (c) spot someone walking in (d) stop a robot near walls
37. 37.⚙️ Which actuator would you use to move water to plants? (a) a servo motor (b) a buzzer (c) an LED (d) a pump
38. 38.🔍 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)?
39. 39.🔍 Which sensor would you use to spot someone walking in? (a) a gas sensor (b) a motion sensor (c) a temperature sensor (d) a light sensor
40. 40.True or false: to open blinds at sunrise, use a light sensor. (a) True (b) False

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