Electronics Worksheet: Sensors and Actuators

Electronics lesson 26: Sensors and actuators · Set 196 · 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 battery (b) a sensor (c) an output that acts (d) a program
2. 2.🔍 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)?
3. 3.🔍 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)?
4. 4.True or false: to warn of a gas leak, use a gas sensor. (a) True (b) False
5. 5.Which job needs a pump? (a) show the temperature (b) beep an alarm (c) move water to plants (d) spin a robot’s wheels
6. 6.Which job needs a servo motor? (a) beep an alarm (b) move water to plants (c) show a status light (d) open a gate to 90°
7. 7.🔍 For a microcontroller, is a sensor an input or an output? (a) a power source (b) an output (c) a fuse (d) an input
8. 8.Which job needs a sound sensor? (a) make a parking alarm (b) keep an incubator warm (c) start a fan when hot (d) measure classroom noise
9. 9.Which job needs a distance sensor? (a) water a dry plant (b) warn of a gas leak (c) switch on lamps at dusk (d) stop a robot near walls
10. 10.🔍 Which sensor would you use to measure classroom noise? (a) a gas sensor (b) a light sensor (c) a temperature sensor (d) a sound sensor
11. 11.⚙️ Which actuator would you use to show a status light? (a) a motor (b) a pump (c) an LED (d) a display
12. 12.🔍 An object is 17 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
13. 13.Which job needs a gas sensor? (a) warn of a gas leak (b) make a parking alarm (c) water a dry plant (d) open blinds at sunrise
14. 14.True or false: to switch on lamps at dusk, use a light sensor. (a) True (b) False
15. 15.Which job needs a distance sensor? (a) spot someone walking in (b) keep an incubator warm (c) make a parking alarm (d) switch on lamps at dusk
16. 16.Which job needs a motor? (a) spin a robot’s wheels (b) turn to an exact angle (c) show a status light (d) move water to plants
17. 17.Which job needs a display? (a) turn to an exact angle (b) show a status light (c) spin a robot’s wheels (d) show the temperature
18. 18.Which job needs a motion sensor? (a) open blinds at sunrise (b) keep an incubator warm (c) start a fan when hot (d) spot someone walking in
19. 19.🔍 A distance sensor sends a sound pulse and hears the echo 6 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
20. 20.⚙️ Which actuator would you use to turn to an exact angle? (a) a buzzer (b) a pump (c) a servo motor (d) a motor
21. 21.True or false: to stop a robot near walls, use a distance sensor. (a) False (b) True
22. 22.🔍 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?
23. 23.🔍 Which sensor would you use to open blinds at sunrise? (a) a soil moisture sensor (b) a light sensor (c) a sound sensor (d) a rain sensor
24. 24.True or false: to keep an incubator warm, use a temperature sensor. (a) False (b) True
25. 25.⚙️ Which actuator would you use to beep an alarm? (a) a pump (b) an LED (c) a buzzer (d) a display
26. 26.True or false: to measure classroom noise, use a sound sensor. (a) True (b) False
27. 27.🔍 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?
28. 28.Which job needs a light sensor? (a) spot someone walking in (b) switch on with a clap (c) switch on lamps at dusk (d) stop a robot near walls
29. 29.🔍 A distance sensor sends a sound pulse and hears the echo 13 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
30. 30.Which job needs a soil moisture sensor? (a) water a dry plant (b) start a fan when hot (c) spot someone walking in (d) warn of a gas leak
31. 31.🔍 Which sensor would you use to make a parking alarm? (a) a sound sensor (b) a gas sensor (c) a distance sensor (d) a light sensor
32. 32.True or false: to stop a robot near walls, use a sound sensor. (a) True (b) False
33. 33.Which job needs a rain sensor? (a) make a parking alarm (b) water a dry plant (c) close a window in rain (d) stop a robot near walls
34. 34.🔍 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)?
35. 35.Which job needs a temperature sensor? (a) spot someone walking in (b) water a dry plant (c) keep an incubator warm (d) close a window in rain
36. 36.🔍 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 temperature sensor
37. 37.⚙️ Which actuator would you use to spin a robot’s wheels? (a) a display (b) an LED (c) a motor (d) a pump
38. 38.🔍 Which sensor would you use to spot someone walking in? (a) a temperature sensor (b) a motion sensor (c) a gas sensor (d) a light sensor
39. 39.🔍 Which sensor would you use to keep an incubator warm? (a) a soil moisture sensor (b) a motion sensor (c) a temperature sensor (d) a sound sensor
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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