Electronics Worksheet: Sensors and Actuators

Electronics lesson 26: Sensors and actuators · Set 274 · 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 soil moisture sensor? (a) water a dry plant (b) switch on with a clap (c) switch on lamps at dusk (d) start a fan when hot
2. 2.🔍 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?
3. 3.🔍 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)?
4. 4.⚙️ Which actuator would you use to open a gate to 90°? (a) a pump (b) a servo motor (c) an LED (d) a display
5. 5.Which job needs a distance sensor? (a) water a dry plant (b) switch on lamps at dusk (c) make a parking alarm (d) spot someone walking in
6. 6.⚙️ Which actuator would you use to show the temperature? (a) a display (b) a pump (c) an LED (d) a motor
7. 7.Which job needs a display? (a) show the temperature (b) beep an alarm (c) open a gate to 90° (d) move water to plants
8. 8.⚙️ Which actuator would you use to turn to an exact angle? (a) a servo motor (b) a pump (c) a motor (d) a display
9. 9.🔍 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)?
10. 10.🔍 Which sensor would you use to measure classroom noise? (a) a rain sensor (b) a soil moisture sensor (c) a sound sensor (d) a distance sensor
11. 11.🔍 A distance sensor sends a sound pulse and hears the echo 3 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
12. 12.Which job needs a light sensor? (a) make a parking alarm (b) measure classroom noise (c) switch on lamps at dusk (d) switch on with a clap
13. 13.🔍 Which sensor would you use to open blinds at sunrise? (a) a gas sensor (b) a rain sensor (c) a distance sensor (d) a light sensor
14. 14.🔍 For a microcontroller, is a sensor an input or an output? (a) an output (b) a power source (c) an input (d) a fuse
15. 15.Which job needs a temperature sensor? (a) open blinds at sunrise (b) switch on lamps at dusk (c) spot someone walking in (d) start a fan when hot
16. 16.True or false: to close a window in rain, use a motion sensor. (a) False (b) True
17. 17.🔍 Which sensor would you use to switch on lamps at dusk? (a) a sound sensor (b) a light sensor (c) a motion sensor (d) a distance sensor
18. 18.Which job needs a servo motor? (a) show a status light (b) move water to plants (c) spin a robot’s wheels (d) open a gate to 90°
19. 19.🔍 Which sensor would you use to switch on with a clap? (a) a distance sensor (b) a gas sensor (c) a rain sensor (d) a sound sensor
20. 20.True or false: to make a parking alarm, use a distance sensor. (a) False (b) True
21. 21.⚙️ Which actuator would you use to spin a robot’s wheels? (a) a pump (b) a servo motor (c) a motor (d) a buzzer
22. 22.⚙️ What is an actuator? (a) a program (b) a battery (c) an output that acts (d) a sensor
23. 23.Which job needs a distance sensor? (a) close a window in rain (b) spot someone walking in (c) stop a robot near walls (d) open blinds at sunrise
24. 24.🔍 Which sensor would you use to warn of a gas leak? (a) a soil moisture sensor (b) a light sensor (c) a gas sensor (d) a distance sensor
25. 25.Which job needs a buzzer? (a) show a status light (b) open a gate to 90° (c) beep an alarm (d) turn to an exact angle
26. 26.Which job needs a light sensor? (a) make a parking alarm (b) water a dry plant (c) open blinds at sunrise (d) keep an incubator warm
27. 27.🔍 Which sensor would you use to spot someone walking in? (a) a temperature sensor (b) a motion sensor (c) a soil moisture sensor (d) a rain sensor
28. 28.🔍 Which sensor would you use to keep an incubator warm? (a) a rain sensor (b) a light sensor (c) a sound sensor (d) a temperature sensor
29. 29.Which job needs a pump? (a) spin a robot’s wheels (b) show a status light (c) turn to an exact angle (d) move water to plants
30. 30.True or false: to switch on with a clap, use a rain sensor. (a) False (b) True
31. 31.🔍 Which sensor would you use to stop a robot near walls? (a) a rain sensor (b) a light sensor (c) a sound sensor (d) a distance sensor
32. 32.🔍 Which sensor would you use to make a parking alarm? (a) a sound sensor (b) a rain sensor (c) a motion sensor (d) a distance sensor
33. 33.True or false: to close a window in rain, use a rain sensor. (a) True (b) False
34. 34.True or false: to switch on with a clap, use a sound sensor. (a) False (b) True
35. 35.True or false: to stop a robot near walls, use a distance sensor. (a) True (b) False
36. 36.True or false: to measure classroom noise, use a gas sensor. (a) False (b) True
37. 37.Which job needs a motor? (a) spin a robot’s wheels (b) open a gate to 90° (c) turn to an exact angle (d) move water to plants
38. 38.True or false: to open blinds at sunrise, use a rain sensor. (a) True (b) False
39. 39.True or false: to open blinds at sunrise, use a light sensor. (a) True (b) False
40. 40.Which job needs a motion sensor? (a) close a window in rain (b) spot someone walking in (c) keep an incubator warm (d) warn of a gas leak

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