Electronics Worksheet: Sensors and Actuators

Electronics lesson 26: Sensors and actuators · Set 241 · 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) open blinds at sunrise (c) start a fan when hot (d) keep an incubator warm
2. 2.Which job needs a gas sensor? (a) switch on with a clap (b) open blinds at sunrise (c) warn of a gas leak (d) measure classroom noise
3. 3.🔍 Which sensor would you use to measure classroom noise? (a) a light sensor (b) a sound sensor (c) a motion sensor (d) a soil moisture sensor
4. 4.Which job needs a sound sensor? (a) make a parking alarm (b) switch on with a clap (c) close a window in rain (d) warn of a gas leak
5. 5.🔍 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?
6. 6.⚙️ Which actuator would you use to turn to an exact angle? (a) a display (b) a buzzer (c) a servo motor (d) a motor
7. 7.⚙️ What is an actuator? (a) a sensor (b) a program (c) a battery (d) an output that acts
8. 8.Which job needs a motion sensor? (a) switch on lamps at dusk (b) close a window in rain (c) measure classroom noise (d) spot someone walking in
9. 9.🔍 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?
10. 10.Which job needs a servo motor? (a) beep an alarm (b) turn to an exact angle (c) show the temperature (d) move water to plants
11. 11.🔍 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?
12. 12.🔍 Which sensor would you use to open blinds at sunrise? (a) a light sensor (b) a motion sensor (c) a sound sensor (d) a distance sensor
13. 13.Which job needs a pump? (a) spin a robot’s wheels (b) turn to an exact angle (c) beep an alarm (d) move water to plants
14. 14.🔍 For a microcontroller, is a sensor an input or an output? (a) an output (b) a fuse (c) an input (d) a power source
15. 15.🔍 Which sensor would you use to switch on lamps at dusk? (a) a distance sensor (b) a light sensor (c) a soil moisture sensor (d) a rain sensor
16. 16.Which job needs a rain sensor? (a) spot someone walking in (b) measure classroom noise (c) warn of a gas leak (d) close a window in rain
17. 17.🔍 A distance sensor sends a sound pulse and hears the echo 20 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
18. 18.⚙️ Which actuator would you use to show a status light? (a) a pump (b) an LED (c) a motor (d) a display
19. 19.True or false: to water a dry plant, use a soil moisture sensor. (a) False (b) True
20. 20.Which job needs an LED? (a) show a status light (b) show the temperature (c) beep an alarm (d) open a gate to 90°
21. 21.Which job needs a servo motor? (a) show a status light (b) show the temperature (c) open a gate to 90° (d) spin a robot’s wheels
22. 22.True or false: to make a parking alarm, use a distance sensor. (a) True (b) False
23. 23.🔍 A distance sensor sends a sound pulse and hears the echo 9 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
24. 24.Which job needs a distance sensor? (a) close a window in rain (b) switch on lamps at dusk (c) spot someone walking in (d) make a parking alarm
25. 25.Which job needs a light sensor? (a) measure classroom noise (b) switch on with a clap (c) switch on lamps at dusk (d) keep an incubator warm
26. 26.🔍 A distance sensor sends a sound pulse and hears the echo 18 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
27. 27.True or false: to stop a robot near walls, use a gas sensor. (a) False (b) True
28. 28.⚙️ Which actuator would you use to spin a robot’s wheels? (a) a buzzer (b) a motor (c) a servo motor (d) a pump
29. 29.⚙️ Which actuator would you use to show the temperature? (a) a servo motor (b) a motor (c) a display (d) a pump
30. 30.🔍 Which sensor would you use to keep an incubator warm? (a) a motion sensor (b) a temperature sensor (c) a light sensor (d) a distance sensor
31. 31.🔍 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)?
32. 32.🔍 Which sensor would you use to make a parking alarm? (a) a rain sensor (b) a distance sensor (c) a temperature sensor (d) a motion sensor
33. 33.🔍 Which sensor would you use to switch on with a clap? (a) a gas sensor (b) a soil moisture sensor (c) a sound sensor (d) a motion sensor
34. 34.True or false: to warn of a gas leak, use a sound sensor. (a) True (b) False
35. 35.⚙️ Which actuator would you use to beep an alarm? (a) a motor (b) a pump (c) a servo motor (d) a buzzer
36. 36.True or false: to spot someone walking in, use a temperature sensor. (a) False (b) True
37. 37.True or false: to start a fan when hot, use a light sensor. (a) False (b) True
38. 38.Which job needs a sound sensor? (a) measure classroom noise (b) water a dry plant (c) start a fan when hot (d) switch on lamps at dusk
39. 39.⚙️ Which actuator would you use to move water to plants? (a) a buzzer (b) a pump (c) a servo motor (d) an LED
40. 40.Which job needs a soil moisture sensor? (a) switch on with a clap (b) stop a robot near walls (c) water a dry plant (d) open blinds at sunrise

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