Electronics Worksheet: Sensors and Actuators

Electronics lesson 26: Sensors and actuators · Set 328 · 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 open a gate to 90°? (a) a servo motor (b) a display (c) a pump (d) a motor
2. 2.⚙️ Which actuator would you use to spin a robot’s wheels? (a) a buzzer (b) an LED (c) a servo motor (d) a motor
3. 3.⚙️ Which actuator would you use to show the temperature? (a) a pump (b) a display (c) an LED (d) a buzzer
4. 4.🔍 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?
5. 5.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
6. 6.⚙️ What is an actuator? (a) a program (b) a sensor (c) an output that acts (d) a battery
7. 7.🔍 Which sensor would you use to start a fan when hot? (a) a sound sensor (b) a gas sensor (c) a rain sensor (d) a temperature sensor
8. 8.🔍 Which sensor would you use to water a dry plant? (a) a distance sensor (b) a motion sensor (c) a temperature sensor (d) a soil moisture sensor
9. 9.🔍 For a microcontroller, is a sensor an input or an output? (a) an output (b) an input (c) a power source (d) a fuse
10. 10.🔍 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)?
11. 11.Which job needs a temperature sensor? (a) switch on with a clap (b) open blinds at sunrise (c) keep an incubator warm (d) close a window in rain
12. 12.True or false: to switch on with a clap, use a sound sensor. (a) True (b) False
13. 13.Which job needs a soil moisture sensor? (a) stop a robot near walls (b) water a dry plant (c) open blinds at sunrise (d) measure classroom noise
14. 14.⚙️ Which actuator would you use to move water to plants? (a) a pump (b) a motor (c) an LED (d) a buzzer
15. 15.Which job needs a sound sensor? (a) open blinds at sunrise (b) switch on lamps at dusk (c) start a fan when hot (d) measure classroom noise
16. 16.🔍 Which sensor would you use to make a parking alarm? (a) a motion sensor (b) a distance sensor (c) a light sensor (d) a gas sensor
17. 17.⚙️ Which actuator would you use to show a status light? (a) a display (b) a motor (c) a buzzer (d) an LED
18. 18.Which job needs a motor? (a) show a status light (b) open a gate to 90° (c) spin a robot’s wheels (d) turn to an exact angle
19. 19.True or false: to measure classroom noise, use a sound sensor. (a) False (b) True
20. 20.Which job needs a servo motor? (a) show the temperature (b) spin a robot’s wheels (c) move water to plants (d) turn to an exact angle
21. 21.🔍 Which sensor would you use to switch on lamps at dusk? (a) a rain sensor (b) a light sensor (c) a distance sensor (d) a soil moisture sensor
22. 22.Which job needs a distance sensor? (a) switch on with a clap (b) make a parking alarm (c) switch on lamps at dusk (d) water a dry plant
23. 23.True or false: to start a fan when hot, use a rain sensor. (a) True (b) False
24. 24.True or false: to switch on lamps at dusk, use a temperature sensor. (a) True (b) False
25. 25.🔍 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)?
26. 26.Which job needs a distance sensor? (a) stop a robot near walls (b) switch on lamps at dusk (c) measure classroom noise (d) warn of a gas leak
27. 27.Which job needs a light sensor? (a) switch on with a clap (b) open blinds at sunrise (c) make a parking alarm (d) close a window in rain
28. 28.🔍 Which sensor would you use to stop a robot near walls? (a) a soil moisture sensor (b) a temperature sensor (c) a motion sensor (d) a distance sensor
29. 29.Which job needs an LED? (a) beep an alarm (b) move water to plants (c) show a status light (d) spin a robot’s wheels
30. 30.True or false: to close a window in rain, use a rain sensor. (a) True (b) False
31. 31.True or false: to water a dry plant, use a rain sensor. (a) False (b) True
32. 32.Which job needs a gas sensor? (a) warn of a gas leak (b) keep an incubator warm (c) close a window in rain (d) make a parking alarm
33. 33.True or false: to open blinds at sunrise, use a rain sensor. (a) True (b) False
34. 34.🔍 Which sensor would you use to measure classroom noise? (a) a sound sensor (b) a distance sensor (c) a soil moisture sensor (d) a gas sensor
35. 35.🔍 Which sensor would you use to keep an incubator warm? (a) a sound sensor (b) a temperature sensor (c) a motion sensor (d) a rain sensor
36. 36.🔍 Which sensor would you use to open blinds at sunrise? (a) a rain sensor (b) a soil moisture sensor (c) a light sensor (d) a distance sensor
37. 37.🔍 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?
38. 38.True or false: to warn of a gas leak, use a gas sensor. (a) True (b) False
39. 39.🔍 Which sensor would you use to warn of a gas leak? (a) a rain sensor (b) a temperature sensor (c) a distance sensor (d) a gas sensor
40. 40.Which job needs a motion sensor? (a) make a parking alarm (b) spot someone walking in (c) open blinds at sunrise (d) keep an incubator warm

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