Electronics Worksheet: Sensors and Actuators

Electronics lesson 26: Sensors and actuators · Set 322 · 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 motion sensor? (a) water a dry plant (b) start a fan when hot (c) switch on lamps at dusk (d) spot someone walking in
2. 2.Which job needs a soil moisture sensor? (a) spot someone walking in (b) keep an incubator warm (c) water a dry plant (d) make a parking alarm
3. 3.🔍 Which sensor would you use to keep an incubator warm? (a) a sound sensor (b) a soil moisture sensor (c) a temperature sensor (d) a light sensor
4. 4.🔍 An object is 221 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
5. 5.🔍 Which sensor would you use to open blinds at sunrise? (a) a distance sensor (b) a temperature sensor (c) a rain sensor (d) a light sensor
6. 6.⚙️ What is an actuator? (a) a sensor (b) a battery (c) an output that acts (d) a program
7. 7.Which job needs a distance sensor? (a) spot someone walking in (b) measure classroom noise (c) keep an incubator warm (d) make a parking alarm
8. 8.⚙️ Which actuator would you use to move water to plants? (a) a servo motor (b) a buzzer (c) a pump (d) an LED
9. 9.🔍 For a microcontroller, is a sensor an input or an output? (a) an output (b) a fuse (c) a power source (d) an input
10. 10.🔍 Which sensor would you use to stop a robot near walls? (a) a rain sensor (b) a soil moisture sensor (c) a temperature sensor (d) a distance sensor
11. 11.Which job needs a distance sensor? (a) measure classroom noise (b) water a dry plant (c) switch on lamps at dusk (d) stop a robot near walls
12. 12.🔍 Which sensor would you use to switch on with a clap? (a) a rain sensor (b) a motion sensor (c) a temperature sensor (d) a sound sensor
13. 13.🔍 Which sensor would you use to measure classroom noise? (a) a temperature sensor (b) a motion sensor (c) a rain sensor (d) a sound sensor
14. 14.Which job needs a rain sensor? (a) close a window in rain (b) warn of a gas leak (c) switch on with a clap (d) start a fan when hot
15. 15.True or false: to open blinds at sunrise, use a sound sensor. (a) True (b) False
16. 16.🔍 Which sensor would you use to warn of a gas leak? (a) a sound sensor (b) a temperature sensor (c) a motion sensor (d) a gas sensor
17. 17.⚙️ Which actuator would you use to beep an alarm? (a) an LED (b) a buzzer (c) a servo motor (d) a motor
18. 18.⚙️ Which actuator would you use to open a gate to 90°? (a) a servo motor (b) a display (c) a motor (d) an LED
19. 19.Which job needs a gas sensor? (a) warn of a gas leak (b) switch on lamps at dusk (c) open blinds at sunrise (d) keep an incubator warm
20. 20.🔍 Which sensor would you use to spot someone walking in? (a) a gas sensor (b) a temperature sensor (c) a rain sensor (d) a motion sensor
21. 21.⚙️ Which actuator would you use to spin a robot’s wheels? (a) a motor (b) a servo motor (c) a buzzer (d) a pump
22. 22.True or false: to close a window in rain, use a rain sensor. (a) True (b) False
23. 23.🔍 Which sensor would you use to make a parking alarm? (a) a gas sensor (b) a soil moisture sensor (c) a sound sensor (d) a distance sensor
24. 24.🔍 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)?
25. 25.🔍 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)?
26. 26.⚙️ Which actuator would you use to show the temperature? (a) a motor (b) a display (c) a pump (d) a buzzer
27. 27.Which job needs an LED? (a) show the temperature (b) beep an alarm (c) move water to plants (d) show a status light
28. 28.Which job needs a buzzer? (a) move water to plants (b) spin a robot’s wheels (c) beep an alarm (d) show the temperature
29. 29.True or false: to start a fan when hot, use a gas sensor. (a) False (b) True
30. 30.Which job needs a servo motor? (a) spin a robot’s wheels (b) turn to an exact angle (c) show the temperature (d) beep an alarm
31. 31.True or false: to keep an incubator warm, use a temperature sensor. (a) True (b) False
32. 32.True or false: to switch on lamps at dusk, use a light sensor. (a) False (b) True
33. 33.🔍 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)?
34. 34.Which job needs a display? (a) show the temperature (b) beep an alarm (c) turn to an exact angle (d) open a gate to 90°
35. 35.Which job needs a motor? (a) show a status light (b) show the temperature (c) turn to an exact angle (d) spin a robot’s wheels
36. 36.🔍 Which sensor would you use to water a dry plant? (a) a distance sensor (b) a motion sensor (c) a soil moisture sensor (d) a light sensor
37. 37.Which job needs a servo motor? (a) spin a robot’s wheels (b) show the temperature (c) beep an alarm (d) open a gate to 90°
38. 38.🔍 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?
39. 39.Which job needs a sound sensor? (a) spot someone walking in (b) measure classroom noise (c) keep an incubator warm (d) start a fan when hot
40. 40.🔍 An object is 255 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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