Electronics Worksheet: Sensors and Actuators

Electronics lesson 26: Sensors and actuators · Set 321 · 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 temperature sensor? (a) warn of a gas leak (b) keep an incubator warm (c) switch on with a clap (d) make a parking alarm
2. 2.🔍 For a microcontroller, is a sensor an input or an output? (a) a power source (b) an input (c) an output (d) a fuse
3. 3.🔍 A distance sensor sends a sound pulse and hears the echo 15 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
4. 4.⚙️ Which actuator would you use to turn to an exact angle? (a) a buzzer (b) a motor (c) an LED (d) a servo motor
5. 5.⚙️ Which actuator would you use to show a status light? (a) a buzzer (b) an LED (c) a servo motor (d) a pump
6. 6.True or false: to keep an incubator warm, use a soil moisture sensor. (a) False (b) True
7. 7.🔍 Which sensor would you use to close a window in rain? (a) a soil moisture sensor (b) a rain sensor (c) a distance sensor (d) a light sensor
8. 8.True or false: to open blinds at sunrise, use a soil moisture sensor. (a) False (b) True
9. 9.⚙️ Which actuator would you use to show the temperature? (a) a display (b) a motor (c) a servo motor (d) a pump
10. 10.True or false: to warn of a gas leak, use a gas sensor. (a) False (b) True
11. 11.⚙️ Which actuator would you use to move water to plants? (a) a buzzer (b) a pump (c) an LED (d) a servo motor
12. 12.True or false: to make a parking alarm, use a distance sensor. (a) False (b) True
13. 13.🔍 Which sensor would you use to warn of a gas leak? (a) a gas sensor (b) a light sensor (c) a temperature sensor (d) a rain sensor
14. 14.Which job needs a temperature sensor? (a) open blinds at sunrise (b) start a fan when hot (c) measure classroom noise (d) warn of a gas leak
15. 15.True or false: to open blinds at sunrise, use a motion sensor. (a) True (b) False
16. 16.True or false: to switch on with a clap, use a sound sensor. (a) False (b) True
17. 17.🔍 Which sensor would you use to stop a robot near walls? (a) a distance sensor (b) a motion sensor (c) a light sensor (d) a soil moisture sensor
18. 18.Which job needs a buzzer? (a) show the temperature (b) spin a robot’s wheels (c) beep an alarm (d) show a status light
19. 19.Which job needs a distance sensor? (a) start a fan when hot (b) switch on lamps at dusk (c) water a dry plant (d) make a parking alarm
20. 20.🔍 Which sensor would you use to measure classroom noise? (a) a sound sensor (b) a light sensor (c) a gas sensor (d) a rain sensor
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 soil moisture sensor? (a) switch on lamps at dusk (b) start a fan when hot (c) measure classroom noise (d) water a dry plant
23. 23.True or false: to close a window in rain, use a gas sensor. (a) True (b) False
24. 24.Which job needs a display? (a) spin a robot’s wheels (b) show the temperature (c) show a status light (d) turn to an exact angle
25. 25.⚙️ Which actuator would you use to beep an alarm? (a) a servo motor (b) a motor (c) a display (d) a buzzer
26. 26.True or false: to start a fan when hot, use a distance sensor. (a) True (b) False
27. 27.True or false: to warn of a gas leak, use a light sensor. (a) False (b) True
28. 28.🔍 A distance sensor sends a sound pulse and hears the echo 8 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
29. 29.True or false: to make a parking alarm, use a gas sensor. (a) True (b) False
30. 30.Which job needs a pump? (a) show the temperature (b) move water to plants (c) show a status light (d) turn to an exact angle
31. 31.🔍 Which sensor would you use to start a fan when hot? (a) a light sensor (b) a rain sensor (c) a temperature sensor (d) a gas sensor
32. 32.🔍 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)?
33. 33.🔍 Which sensor would you use to switch on with a clap? (a) a light sensor (b) a motion sensor (c) a sound sensor (d) a soil moisture sensor
34. 34.🔍 A distance sensor sends a sound pulse and hears the echo 19 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
35. 35.🔍 An object is 68 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
36. 36.Which job needs a gas sensor? (a) keep an incubator warm (b) open blinds at sunrise (c) warn of a gas leak (d) stop a robot near walls
37. 37.⚙️ Which actuator would you use to spin a robot’s wheels? (a) a buzzer (b) an LED (c) a servo motor (d) a motor
38. 38.🔍 Which sensor would you use to switch on lamps at dusk? (a) a light sensor (b) a sound sensor (c) a gas sensor (d) a distance sensor
39. 39.⚙️ Which actuator would you use to open a gate to 90°? (a) an LED (b) a pump (c) a servo motor (d) a motor
40. 40.Which job needs a motion sensor? (a) close a window in rain (b) spot someone walking in (c) open blinds at sunrise (d) keep an incubator warm

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