Electronics Worksheet: Sensors and Actuators

Electronics lesson 26: Sensors and actuators · Set 69 · 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) switch on lamps at dusk (c) keep an incubator warm (d) warn of a gas leak
2. 2.True or false: to make a parking alarm, use a rain sensor. (a) True (b) False
3. 3.True or false: to stop a robot near walls, use a light sensor. (a) True (b) False
4. 4.⚙️ Which actuator would you use to show the temperature? (a) a servo motor (b) a pump (c) a display (d) a buzzer
5. 5.🔍 Which sensor would you use to switch on lamps at dusk? (a) a gas sensor (b) a light sensor (c) a temperature sensor (d) a distance sensor
6. 6.⚙️ Which actuator would you use to show a status light? (a) a buzzer (b) a display (c) a motor (d) an LED
7. 7.⚙️ What is an actuator? (a) an output that acts (b) a battery (c) a program (d) a sensor
8. 8.🔍 For a microcontroller, is a sensor an input or an output? (a) an input (b) an output (c) a power source (d) a fuse
9. 9.🔍 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)?
10. 10.True or false: to close a window in rain, use a rain sensor. (a) True (b) False
11. 11.🔍 Which sensor would you use to stop a robot near walls? (a) a soil moisture sensor (b) a distance sensor (c) a sound sensor (d) a motion sensor
12. 12.🔍 An object is 272 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
13. 13.🔍 An object is 238 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
14. 14.🔍 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?
15. 15.🔍 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?
16. 16.⚙️ Which actuator would you use to move water to plants? (a) a buzzer (b) a motor (c) a pump (d) a display
17. 17.🔍 Which sensor would you use to start a fan when hot? (a) a temperature sensor (b) a rain sensor (c) a light sensor (d) a distance sensor
18. 18.Which job needs a soil moisture sensor? (a) start a fan when hot (b) water a dry plant (c) stop a robot near walls (d) switch on lamps at dusk
19. 19.⚙️ Which actuator would you use to open a gate to 90°? (a) a motor (b) an LED (c) a display (d) a servo motor
20. 20.Which job needs a rain sensor? (a) open blinds at sunrise (b) close a window in rain (c) switch on lamps at dusk (d) keep an incubator warm
21. 21.Which job needs a buzzer? (a) show a status light (b) beep an alarm (c) spin a robot’s wheels (d) show the temperature
22. 22.Which job needs a sound sensor? (a) warn of a gas leak (b) water a dry plant (c) switch on lamps at dusk (d) switch on with a clap
23. 23.🔍 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)?
24. 24.True or false: to switch on lamps at dusk, use a soil moisture sensor. (a) True (b) False
25. 25.True or false: to switch on with a clap, use a sound sensor. (a) True (b) False
26. 26.Which job needs a servo motor? (a) move water to plants (b) beep an alarm (c) open a gate to 90° (d) spin a robot’s wheels
27. 27.Which job needs a display? (a) move water to plants (b) turn to an exact angle (c) beep an alarm (d) show the temperature
28. 28.Which job needs a temperature sensor? (a) start a fan when hot (b) open blinds at sunrise (c) stop a robot near walls (d) switch on with a clap
29. 29.🔍 Which sensor would you use to open blinds at sunrise? (a) a light sensor (b) a soil moisture sensor (c) a distance sensor (d) a temperature sensor
30. 30.True or false: to spot someone walking in, use a distance sensor. (a) True (b) False
31. 31.Which job needs a motor? (a) open a gate to 90° (b) show a status light (c) move water to plants (d) spin a robot’s wheels
32. 32.True or false: to start a fan when hot, use a temperature sensor. (a) False (b) True
33. 33.🔍 Which sensor would you use to make a parking alarm? (a) a light sensor (b) a motion sensor (c) a rain sensor (d) a distance sensor
34. 34.True or false: to close a window in rain, use a sound sensor. (a) True (b) False
35. 35.🔍 Which sensor would you use to water a dry plant? (a) a rain sensor (b) a soil moisture sensor (c) a light sensor (d) a sound sensor
36. 36.Which job needs a motion sensor? (a) make a parking alarm (b) warn of a gas leak (c) water a dry plant (d) spot someone walking in
37. 37.🔍 Which sensor would you use to switch on with a clap? (a) a motion sensor (b) a distance sensor (c) a rain sensor (d) a sound sensor
38. 38.🔍 Which sensor would you use to measure classroom noise? (a) a motion sensor (b) a sound sensor (c) a rain sensor (d) a distance sensor
39. 39.True or false: to stop a robot near walls, use a motion sensor. (a) False (b) True
40. 40.🔍 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)?

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