Electronics Worksheet: Sensors and Actuators

Electronics lesson 26: Sensors and actuators · Set 206 · 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 sensor would you use to start a fan when hot? (a) a temperature sensor (b) a gas sensor (c) a sound sensor (d) a distance sensor
2. 2.Which job needs a rain sensor? (a) stop a robot near walls (b) close a window in rain (c) make a parking alarm (d) keep an incubator warm
3. 3.🔍 A distance sensor sends a sound pulse and hears the echo 12 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 show a status light? (a) a buzzer (b) a pump (c) a servo motor (d) an LED
5. 5.🔍 For a microcontroller, is a sensor an input or an output? (a) a power source (b) a fuse (c) an output (d) an input
6. 6.Which job needs a motion sensor? (a) spot someone walking in (b) measure classroom noise (c) make a parking alarm (d) switch on lamps at dusk
7. 7.🔍 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)?
8. 8.True or false: to make a parking alarm, use a motion sensor. (a) False (b) True
9. 9.🔍 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?
10. 10.Which job needs a soil moisture sensor? (a) switch on lamps at dusk (b) warn of a gas leak (c) water a dry plant (d) switch on with a clap
11. 11.Which job needs a motor? (a) move water to plants (b) spin a robot’s wheels (c) beep an alarm (d) turn to an exact angle
12. 12.Which job needs a light sensor? (a) spot someone walking in (b) start a fan when hot (c) make a parking alarm (d) switch on lamps at dusk
13. 13.Which job needs a sound sensor? (a) measure classroom noise (b) start a fan when hot (c) stop a robot near walls (d) switch on lamps at dusk
14. 14.🔍 Which sensor would you use to spot someone walking in? (a) a distance sensor (b) a light sensor (c) a sound sensor (d) a motion sensor
15. 15.⚙️ Which actuator would you use to show the temperature? (a) a display (b) a buzzer (c) a pump (d) a servo motor
16. 16.⚙️ Which actuator would you use to move water to plants? (a) a buzzer (b) a servo motor (c) a pump (d) a motor
17. 17.⚙️ What is an actuator? (a) an output that acts (b) a battery (c) a sensor (d) a program
18. 18.True or false: to start a fan when hot, use a gas sensor. (a) False (b) True
19. 19.True or false: to water a dry plant, use a temperature sensor. (a) True (b) False
20. 20.Which job needs a buzzer? (a) show the temperature (b) move water to plants (c) beep an alarm (d) turn to an exact angle
21. 21.🔍 An object is 255 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
22. 22.🔍 Which sensor would you use to warn of a gas leak? (a) a motion sensor (b) a gas sensor (c) a soil moisture sensor (d) a temperature sensor
23. 23.🔍 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)?
24. 24.🔍 Which sensor would you use to switch on lamps at dusk? (a) a gas sensor (b) a rain sensor (c) a light sensor (d) a sound sensor
25. 25.True or false: to open blinds at sunrise, use a light sensor. (a) True (b) False
26. 26.Which job needs a display? (a) show the temperature (b) turn to an exact angle (c) move water to plants (d) show a status light
27. 27.Which job needs an LED? (a) open a gate to 90° (b) show a status light (c) spin a robot’s wheels (d) beep an alarm
28. 28.True or false: to keep an incubator warm, use a temperature sensor. (a) True (b) False
29. 29.True or false: to start a fan when hot, use a temperature sensor. (a) True (b) False
30. 30.True or false: to water a dry plant, use a soil moisture sensor. (a) False (b) True
31. 31.🔍 Which sensor would you use to make a parking alarm? (a) a light sensor (b) a temperature sensor (c) a distance sensor (d) a gas sensor
32. 32.⚙️ Which actuator would you use to spin a robot’s wheels? (a) an LED (b) a buzzer (c) a motor (d) a servo motor
33. 33.🔍 A distance sensor sends a sound pulse and hears the echo 4 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
34. 34.⚙️ Which actuator would you use to open a gate to 90°? (a) an LED (b) a servo motor (c) a pump (d) a buzzer
35. 35.Which job needs a gas sensor? (a) measure classroom noise (b) warn of a gas leak (c) spot someone walking in (d) start a fan when hot
36. 36.True or false: to water a dry plant, use a light sensor. (a) False (b) True
37. 37.Which job needs a servo motor? (a) spin a robot’s wheels (b) open a gate to 90° (c) move water to plants (d) show a status light
38. 38.🔍 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)?
39. 39.🔍 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)?
40. 40.🔍 Which sensor would you use to keep an incubator warm? (a) a light sensor (b) a distance sensor (c) a temperature sensor (d) a soil moisture sensor

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