Electronics Worksheet: Sensors and Actuators

Electronics lesson 26: Sensors and actuators · Set 342 · 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.⚙️ What is an actuator? (a) a sensor (b) a program (c) a battery (d) an output that acts
2. 2.Which job needs a pump? (a) show a status light (b) open a gate to 90° (c) spin a robot’s wheels (d) move water to plants
3. 3.Which job needs a light sensor? (a) open blinds at sunrise (b) warn of a gas leak (c) keep an incubator warm (d) measure classroom noise
4. 4.🔍 Which sensor would you use to make a parking alarm? (a) a sound sensor (b) a distance sensor (c) a motion sensor (d) a temperature sensor
5. 5.🔍 Which sensor would you use to close a window in rain? (a) a sound sensor (b) a rain sensor (c) a light sensor (d) a gas sensor
6. 6.True or false: to water a dry plant, use a rain sensor. (a) True (b) False
7. 7.True or false: to measure classroom noise, use a gas sensor. (a) False (b) True
8. 8.🔍 Which sensor would you use to measure classroom noise? (a) a motion sensor (b) a light sensor (c) a sound sensor (d) a gas sensor
9. 9.🔍 For a microcontroller, is a sensor an input or an output? (a) an input (b) an output (c) a fuse (d) a power source
10. 10.Which job needs a motor? (a) spin a robot’s wheels (b) open a gate to 90° (c) move water to plants (d) turn to an exact angle
11. 11.🔍 A distance sensor sends a sound pulse and hears the echo 14 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
12. 12.⚙️ Which actuator would you use to show a status light? (a) a motor (b) an LED (c) a display (d) a pump
13. 13.🔍 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?
14. 14.True or false: to make a parking alarm, use a distance sensor. (a) False (b) True
15. 15.🔍 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)?
16. 16.⚙️ Which actuator would you use to move water to plants? (a) a display (b) a buzzer (c) a motor (d) a pump
17. 17.⚙️ Which actuator would you use to show the temperature? (a) a servo motor (b) a display (c) an LED (d) a buzzer
18. 18.Which job needs a buzzer? (a) beep an alarm (b) move water to plants (c) show the temperature (d) show a status light
19. 19.Which job needs a gas sensor? (a) keep an incubator warm (b) close a window in rain (c) warn of a gas leak (d) open blinds at sunrise
20. 20.🔍 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)?
21. 21.⚙️ Which actuator would you use to open a gate to 90°? (a) a pump (b) a display (c) an LED (d) a servo motor
22. 22.Which job needs a sound sensor? (a) start a fan when hot (b) spot someone walking in (c) make a parking alarm (d) switch on with a clap
23. 23.True or false: to measure classroom noise, use a sound sensor. (a) False (b) True
24. 24.True or false: to switch on lamps at dusk, use a light sensor. (a) False (b) True
25. 25.Which job needs a rain sensor? (a) switch on lamps at dusk (b) close a window in rain (c) stop a robot near walls (d) keep an incubator warm
26. 26.🔍 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)?
27. 27.True or false: to stop a robot near walls, use a distance sensor. (a) True (b) False
28. 28.🔍 Which sensor would you use to switch on with a clap? (a) a sound sensor (b) a soil moisture sensor (c) a temperature sensor (d) a motion sensor
29. 29.True or false: to warn of a gas leak, use a gas sensor. (a) True (b) False
30. 30.🔍 Which sensor would you use to switch on lamps at dusk? (a) a gas sensor (b) a sound sensor (c) a rain sensor (d) a light sensor
31. 31.🔍 Which sensor would you use to keep an incubator warm? (a) a temperature sensor (b) a distance sensor (c) a sound sensor (d) a light sensor
32. 32.🔍 Which sensor would you use to stop a robot near walls? (a) a distance sensor (b) a sound sensor (c) a soil moisture sensor (d) a light sensor
33. 33.Which job needs a motion sensor? (a) make a parking alarm (b) spot someone walking in (c) start a fan when hot (d) close a window in rain
34. 34.Which job needs a servo motor? (a) show a status light (b) move water to plants (c) open a gate to 90° (d) beep an alarm
35. 35.🔍 A distance sensor sends a sound pulse and hears the echo 20 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
36. 36.⚙️ Which actuator would you use to spin a robot’s wheels? (a) a pump (b) an LED (c) a servo motor (d) a motor
37. 37.True or false: to stop a robot near walls, use a rain sensor. (a) False (b) True
38. 38.Which job needs a temperature sensor? (a) warn of a gas leak (b) stop a robot near walls (c) keep an incubator warm (d) spot someone walking in
39. 39.Which job needs a distance sensor? (a) close a window in rain (b) stop a robot near walls (c) open blinds at sunrise (d) keep an incubator warm
40. 40.🔍 A distance sensor sends a sound pulse and hears the echo 1 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?

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