Electronics Worksheet: Sensors and Actuators

Electronics lesson 26: Sensors and actuators · Set 114 · 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 actuator would you use to move water to plants? (a) a pump (b) an LED (c) a servo motor (d) a motor
2. 2.Which job needs a temperature sensor? (a) warn of a gas leak (b) stop a robot near walls (c) switch on with a clap (d) start a fan when hot
3. 3.⚙️ Which actuator would you use to show a status light? (a) a servo motor (b) an LED (c) a display (d) a buzzer
4. 4.True or false: to switch on with a clap, use a soil moisture sensor. (a) True (b) False
5. 5.⚙️ What is an actuator? (a) an output that acts (b) a sensor (c) a battery (d) a program
6. 6.🔍 Which sensor would you use to open blinds at sunrise? (a) a rain sensor (b) a light sensor (c) a sound sensor (d) a distance sensor
7. 7.🔍 A distance sensor sends a sound pulse and hears the echo 2 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
8. 8.True or false: to open blinds at sunrise, use a light sensor. (a) True (b) False
9. 9.🔍 An object is 68 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 distance sensor? (a) warn of a gas leak (b) start a fan when hot (c) spot someone walking in (d) make a parking alarm
11. 11.🔍 Which sensor would you use to keep an incubator warm? (a) a distance sensor (b) a soil moisture sensor (c) a temperature sensor (d) a motion sensor
12. 12.True or false: to start a fan when hot, use a temperature sensor. (a) True (b) False
13. 13.True or false: to water a dry plant, use a sound sensor. (a) True (b) False
14. 14.True or false: to switch on with a clap, use a sound sensor. (a) False (b) True
15. 15.Which job needs a distance sensor? (a) keep an incubator warm (b) start a fan when hot (c) spot someone walking in (d) stop a robot near walls
16. 16.Which job needs a sound sensor? (a) measure classroom noise (b) close a window in rain (c) open blinds at sunrise (d) spot someone walking in
17. 17.Which job needs a motor? (a) turn to an exact angle (b) show the temperature (c) spin a robot’s wheels (d) open a gate to 90°
18. 18.🔍 For a microcontroller, is a sensor an input or an output? (a) a fuse (b) a power source (c) an output (d) an input
19. 19.🔍 A distance sensor sends a sound pulse and hears the echo 10 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
20. 20.Which job needs a servo motor? (a) spin a robot’s wheels (b) turn to an exact angle (c) move water to plants (d) show a status light
21. 21.Which job needs a rain sensor? (a) keep an incubator warm (b) close a window in rain (c) make a parking alarm (d) water a dry plant
22. 22.🔍 Which sensor would you use to switch on with a clap? (a) a rain sensor (b) a light sensor (c) a temperature sensor (d) a sound sensor
23. 23.⚙️ Which actuator would you use to show the temperature? (a) a servo motor (b) a motor (c) a display (d) an LED
24. 24.🔍 Which sensor would you use to water a dry plant? (a) a soil moisture sensor (b) a motion sensor (c) a rain sensor (d) a temperature sensor
25. 25.Which job needs a pump? (a) open a gate to 90° (b) move water to plants (c) show the temperature (d) spin a robot’s wheels
26. 26.True or false: to close a window in rain, use a motion sensor. (a) True (b) False
27. 27.Which job needs a light sensor? (a) switch on with a clap (b) spot someone walking in (c) keep an incubator warm (d) switch on lamps at dusk
28. 28.True or false: to open blinds at sunrise, use a rain sensor. (a) True (b) False
29. 29.🔍 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?
30. 30.True or false: to start a fan when hot, use a sound sensor. (a) True (b) False
31. 31.⚙️ Which actuator would you use to spin a robot’s wheels? (a) a motor (b) a buzzer (c) a pump (d) a display
32. 32.🔍 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)?
33. 33.Which job needs a temperature sensor? (a) water a dry plant (b) keep an incubator warm (c) stop a robot near walls (d) open blinds at sunrise
34. 34.🔍 Which sensor would you use to start a fan when hot? (a) a distance sensor (b) a gas sensor (c) a temperature sensor (d) a soil moisture sensor
35. 35.🔍 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?
36. 36.🔍 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?
37. 37.⚙️ Which actuator would you use to turn to an exact angle? (a) a servo motor (b) a motor (c) an LED (d) a pump
38. 38.Which job needs a light sensor? (a) start a fan when hot (b) open blinds at sunrise (c) water a dry plant (d) close a window in rain
39. 39.🔍 Which sensor would you use to close a window in rain? (a) a temperature sensor (b) a sound sensor (c) a light sensor (d) a rain sensor
40. 40.Which job needs an LED? (a) show a status light (b) beep an alarm (c) turn to an exact angle (d) move water to plants

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