Electronics Worksheet: Sensors and Actuators

Electronics lesson 26: Sensors and actuators · Set 269 · 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 turn to an exact angle? (a) a pump (b) an LED (c) a servo motor (d) a buzzer
2. 2.⚙️ Which actuator would you use to spin a robot’s wheels? (a) a display (b) a motor (c) a servo motor (d) an LED
3. 3.⚙️ What is an actuator? (a) a sensor (b) a program (c) a battery (d) an output that acts
4. 4.Which job needs a buzzer? (a) show the temperature (b) turn to an exact angle (c) beep an alarm (d) show a status light
5. 5.Which job needs a display? (a) show a status light (b) turn to an exact angle (c) beep an alarm (d) show the temperature
6. 6.🔍 Which sensor would you use to measure classroom noise? (a) a light sensor (b) a gas sensor (c) a sound sensor (d) a rain sensor
7. 7.🔍 For a microcontroller, is a sensor an input or an output? (a) a fuse (b) a power source (c) an input (d) an output
8. 8.🔍 Which sensor would you use to water a dry plant? (a) a distance sensor (b) a gas sensor (c) a soil moisture sensor (d) a sound sensor
9. 9.⚙️ Which actuator would you use to show a status light? (a) a motor (b) a buzzer (c) a servo motor (d) an LED
10. 10.🔍 An object is 136 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
11. 11.Which job needs a soil moisture sensor? (a) make a parking alarm (b) water a dry plant (c) open blinds at sunrise (d) keep an incubator warm
12. 12.🔍 Which sensor would you use to warn of a gas leak? (a) a motion sensor (b) a light sensor (c) a gas sensor (d) a distance sensor
13. 13.🔍 Which sensor would you use to keep an incubator warm? (a) a rain sensor (b) a temperature sensor (c) a motion sensor (d) a soil moisture sensor
14. 14.True or false: to measure classroom noise, use a sound sensor. (a) False (b) True
15. 15.True or false: to open blinds at sunrise, use a temperature sensor. (a) True (b) False
16. 16.True or false: to switch on lamps at dusk, use a sound sensor. (a) False (b) True
17. 17.Which job needs an LED? (a) turn to an exact angle (b) show a status light (c) open a gate to 90° (d) beep an alarm
18. 18.Which job needs a servo motor? (a) show a status light (b) move water to plants (c) turn to an exact angle (d) spin a robot’s wheels
19. 19.Which job needs a rain sensor? (a) close a window in rain (b) measure classroom noise (c) warn of a gas leak (d) water a dry plant
20. 20.🔍 An object is 51 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
21. 21.🔍 Which sensor would you use to open blinds at sunrise? (a) a temperature sensor (b) a light sensor (c) a motion sensor (d) a gas sensor
22. 22.Which job needs a sound sensor? (a) measure classroom noise (b) make a parking alarm (c) spot someone walking in (d) warn of a gas leak
23. 23.Which job needs a temperature sensor? (a) water a dry plant (b) switch on lamps at dusk (c) keep an incubator warm (d) measure classroom noise
24. 24.🔍 An object is 221 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
25. 25.⚙️ Which actuator would you use to show the temperature? (a) a servo motor (b) a display (c) an LED (d) a pump
26. 26.Which job needs a gas sensor? (a) start a fan when hot (b) warn of a gas leak (c) open blinds at sunrise (d) stop a robot near walls
27. 27.🔍 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?
28. 28.Which job needs a distance sensor? (a) spot someone walking in (b) stop a robot near walls (c) measure classroom noise (d) open blinds at sunrise
29. 29.Which job needs a motion sensor? (a) spot someone walking in (b) warn of a gas leak (c) water a dry plant (d) close a window in rain
30. 30.True or false: to keep an incubator warm, use a sound sensor. (a) True (b) False
31. 31.🔍 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)?
32. 32.🔍 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)?
33. 33.🔍 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)?
34. 34.🔍 Which sensor would you use to switch on with a clap? (a) a distance sensor (b) a temperature sensor (c) a soil moisture sensor (d) a sound sensor
35. 35.True or false: to measure classroom noise, use a distance sensor. (a) False (b) True
36. 36.🔍 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)?
37. 37.Which job needs a light sensor? (a) spot someone walking in (b) switch on with a clap (c) measure classroom noise (d) open blinds at sunrise
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.Which job needs a temperature sensor? (a) water a dry plant (b) start a fan when hot (c) switch on with a clap (d) spot someone walking in
40. 40.Which job needs a motor? (a) spin a robot’s wheels (b) beep an alarm (c) turn to an exact angle (d) show a status light

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