Electronics Worksheet: Sensors and Actuators

Electronics lesson 26: Sensors and actuators · Set 226 · 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 sensor would you use to switch on lamps at dusk? (a) a soil moisture sensor (b) a light sensor (c) a gas sensor (d) a rain sensor
2. 2.🔍 An object is 204 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
3. 3.Which job needs a servo motor? (a) spin a robot’s wheels (b) show the temperature (c) move water to plants (d) open a gate to 90°
4. 4.⚙️ Which actuator would you use to show the temperature? (a) a motor (b) a display (c) an LED (d) a pump
5. 5.⚙️ Which actuator would you use to move water to plants? (a) a servo motor (b) a motor (c) a display (d) a pump
6. 6.⚙️ Which actuator would you use to beep an alarm? (a) a buzzer (b) a servo motor (c) a display (d) an LED
7. 7.🔍 An object is 119 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
8. 8.Which job needs a rain sensor? (a) warn of a gas leak (b) switch on with a clap (c) close a window in rain (d) spot someone walking in
9. 9.Which job needs a display? (a) open a gate to 90° (b) beep an alarm (c) show a status light (d) show the temperature
10. 10.Which job needs a motor? (a) beep an alarm (b) open a gate to 90° (c) spin a robot’s wheels (d) move water to plants
11. 11.Which job needs a temperature sensor? (a) close a window in rain (b) make a parking alarm (c) warn of a gas leak (d) start a fan when hot
12. 12.🔍 Which sensor would you use to spot someone walking in? (a) a motion sensor (b) a sound sensor (c) a light sensor (d) a soil moisture sensor
13. 13.⚙️ Which actuator would you use to spin a robot’s wheels? (a) a pump (b) a servo motor (c) a motor (d) an LED
14. 14.True or false: to stop a robot near walls, use a distance sensor. (a) False (b) True
15. 15.🔍 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)?
16. 16.🔍 Which sensor would you use to open blinds at sunrise? (a) a motion sensor (b) a light sensor (c) a sound sensor (d) a temperature sensor
17. 17.🔍 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)?
18. 18.True or false: to keep an incubator warm, use a distance sensor. (a) True (b) False
19. 19.🔍 For a microcontroller, is a sensor an input or an output? (a) a fuse (b) a power source (c) an output (d) an input
20. 20.🔍 Which sensor would you use to stop a robot near walls? (a) a distance sensor (b) a gas sensor (c) a temperature sensor (d) a motion sensor
21. 21.True or false: to measure classroom noise, use a motion sensor. (a) False (b) True
22. 22.Which job needs an LED? (a) show a status light (b) move water to plants (c) beep an alarm (d) open a gate to 90°
23. 23.True or false: to close a window in rain, use a rain sensor. (a) False (b) True
24. 24.Which job needs a soil moisture sensor? (a) open blinds at sunrise (b) switch on lamps at dusk (c) stop a robot near walls (d) water a dry plant
25. 25.Which job needs a gas sensor? (a) warn of a gas leak (b) switch on lamps at dusk (c) keep an incubator warm (d) switch on with a clap
26. 26.🔍 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?
27. 27.Which job needs a buzzer? (a) open a gate to 90° (b) beep an alarm (c) show a status light (d) show the temperature
28. 28.Which job needs a sound sensor? (a) water a dry plant (b) stop a robot near walls (c) switch on lamps at dusk (d) measure classroom noise
29. 29.⚙️ What is an actuator? (a) a sensor (b) an output that acts (c) a program (d) a battery
30. 30.Which job needs a light sensor? (a) measure classroom noise (b) spot someone walking in (c) open blinds at sunrise (d) keep an incubator warm
31. 31.🔍 A distance sensor sends a sound pulse and hears the echo 11 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
32. 32.Which job needs a pump? (a) move water to plants (b) show a status light (c) show the temperature (d) open a gate to 90°
33. 33.🔍 Which sensor would you use to measure classroom noise? (a) a sound sensor (b) a soil moisture sensor (c) a temperature sensor (d) a gas sensor
34. 34.🔍 Which sensor would you use to switch on with a clap? (a) a rain sensor (b) a motion sensor (c) a sound sensor (d) a distance sensor
35. 35.⚙️ Which actuator would you use to turn to an exact angle? (a) a buzzer (b) a display (c) a pump (d) a servo motor
36. 36.True or false: to spot someone walking in, use a motion sensor. (a) True (b) False
37. 37.⚙️ Which actuator would you use to open a gate to 90°? (a) a display (b) an LED (c) a motor (d) a servo motor
38. 38.True or false: to switch on lamps at dusk, use a sound sensor. (a) True (b) False
39. 39.🔍 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)?
40. 40.🔍 An object is 323 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?

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