Electronics Worksheet: Sensors and Actuators

Electronics lesson 26: Sensors and actuators · Set 187 · 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 light sensor? (a) water a dry plant (b) measure classroom noise (c) switch on with a clap (d) open blinds at sunrise
2. 2.🔍 Which sensor would you use to start a fan when hot? (a) a gas sensor (b) a temperature sensor (c) a light sensor (d) a motion sensor
3. 3.True or false: to stop a robot near walls, use a distance sensor. (a) False (b) True
4. 4.🔍 For a microcontroller, is a sensor an input or an output? (a) a power source (b) a fuse (c) an output (d) an input
5. 5.⚙️ Which actuator would you use to move water to plants? (a) a display (b) a buzzer (c) a pump (d) a servo motor
6. 6.True or false: to measure classroom noise, use a sound sensor. (a) True (b) False
7. 7.🔍 Which sensor would you use to measure classroom noise? (a) a rain sensor (b) a sound sensor (c) a temperature sensor (d) a gas sensor
8. 8.Which job needs a pump? (a) move water to plants (b) open a gate to 90° (c) beep an alarm (d) spin a robot’s wheels
9. 9.🔍 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)?
10. 10.⚙️ Which actuator would you use to beep an alarm? (a) a servo motor (b) a display (c) a motor (d) a buzzer
11. 11.🔍 Which sensor would you use to keep an incubator warm? (a) a sound sensor (b) a temperature sensor (c) a rain sensor (d) a soil moisture sensor
12. 12.Which job needs a soil moisture sensor? (a) water a dry plant (b) spot someone walking in (c) stop a robot near walls (d) switch on with a clap
13. 13.Which job needs a rain sensor? (a) close a window in rain (b) keep an incubator warm (c) open blinds at sunrise (d) warn of a gas leak
14. 14.True or false: to switch on with a clap, use a light sensor. (a) False (b) True
15. 15.🔍 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?
16. 16.🔍 An object is 289 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
17. 17.⚙️ What is an actuator? (a) a battery (b) an output that acts (c) a program (d) a sensor
18. 18.🔍 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?
19. 19.True or false: to measure classroom noise, use a temperature sensor. (a) False (b) True
20. 20.🔍 Which sensor would you use to spot someone walking in? (a) a soil moisture sensor (b) a sound sensor (c) a motion sensor (d) a light sensor
21. 21.True or false: to switch on lamps at dusk, use a light sensor. (a) False (b) True
22. 22.True or false: to switch on with a clap, use a soil moisture sensor. (a) True (b) False
23. 23.Which job needs a servo motor? (a) move water to plants (b) open a gate to 90° (c) beep an alarm (d) show the temperature
24. 24.🔍 An object is 187 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
25. 25.True or false: to open blinds at sunrise, use a distance sensor. (a) True (b) False
26. 26.Which job needs a buzzer? (a) show a status light (b) beep an alarm (c) show the temperature (d) open a gate to 90°
27. 27.True or false: to keep an incubator warm, use a temperature sensor. (a) False (b) True
28. 28.Which job needs a servo motor? (a) show the temperature (b) show a status light (c) turn to an exact angle (d) spin a robot’s wheels
29. 29.⚙️ Which actuator would you use to spin a robot’s wheels? (a) a motor (b) a pump (c) a servo motor (d) a buzzer
30. 30.True or false: to start a fan when hot, use a gas sensor. (a) True (b) False
31. 31.True or false: to switch on lamps at dusk, use a temperature sensor. (a) False (b) True
32. 32.🔍 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)?
33. 33.Which job needs a display? (a) spin a robot’s wheels (b) show the temperature (c) beep an alarm (d) move water to plants
34. 34.🔍 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)?
35. 35.Which job needs a motor? (a) open a gate to 90° (b) show the temperature (c) beep an alarm (d) spin a robot’s wheels
36. 36.True or false: to make a parking alarm, use a distance sensor. (a) True (b) False
37. 37.⚙️ Which actuator would you use to show the temperature? (a) a pump (b) an LED (c) a motor (d) a display
38. 38.True or false: to warn of a gas leak, use a gas sensor. (a) True (b) False
39. 39.Which job needs a sound sensor? (a) switch on with a clap (b) start a fan when hot (c) stop a robot near walls (d) warn of a gas leak
40. 40.🔍 Which sensor would you use to stop a robot near walls? (a) a gas sensor (b) a rain sensor (c) a distance sensor (d) a motion sensor

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