Electronics Worksheet: Sensors and Actuators

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

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