Electronics Worksheet: Sensors and Actuators

Electronics lesson 26: Sensors and actuators · Set 138 · 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 turn to an exact angle? (a) a pump (b) a servo motor (c) an LED (d) a motor
2. 2.Which job needs a sound sensor? (a) switch on with a clap (b) spot someone walking in (c) open blinds at sunrise (d) warn of a gas leak
3. 3.True or false: to spot someone walking in, use a sound sensor. (a) True (b) False
4. 4.True or false: to open blinds at sunrise, use a light sensor. (a) False (b) True
5. 5.Which job needs a rain sensor? (a) close a window in rain (b) keep an incubator warm (c) measure classroom noise (d) switch on lamps at dusk
6. 6.🔍 Which sensor would you use to start a fan when hot? (a) a temperature sensor (b) a sound sensor (c) a rain sensor (d) a gas sensor
7. 7.Which job needs a temperature sensor? (a) spot someone walking in (b) start a fan when hot (c) open blinds at sunrise (d) switch on with a clap
8. 8.🔍 Which sensor would you use to switch on with a clap? (a) a temperature sensor (b) a gas sensor (c) a motion sensor (d) a sound sensor
9. 9.🔍 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)?
10. 10.True or false: to make a parking alarm, use a distance sensor. (a) True (b) False
11. 11.🔍 Which sensor would you use to open blinds at sunrise? (a) a motion sensor (b) a sound sensor (c) a light sensor (d) a distance sensor
12. 12.Which job needs a servo motor? (a) show a status light (b) show the temperature (c) beep an alarm (d) open a gate to 90°
13. 13.Which job needs a distance sensor? (a) stop a robot near walls (b) keep an incubator warm (c) warn of a gas leak (d) water a dry plant
14. 14.True or false: to water a dry plant, use a soil moisture sensor. (a) False (b) True
15. 15.🔍 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?
16. 16.🔍 For a microcontroller, is a sensor an input or an output? (a) a fuse (b) an output (c) a power source (d) an input
17. 17.Which job needs a pump? (a) spin a robot’s wheels (b) beep an alarm (c) move water to plants (d) show the temperature
18. 18.🔍 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)?
19. 19.⚙️ Which actuator would you use to open a gate to 90°? (a) a pump (b) a motor (c) a servo motor (d) an LED
20. 20.🔍 An object is 51 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
21. 21.Which job needs an LED? (a) beep an alarm (b) show a status light (c) turn to an exact angle (d) spin a robot’s wheels
22. 22.Which job needs a display? (a) show a status light (b) beep an alarm (c) spin a robot’s wheels (d) show the temperature
23. 23.⚙️ Which actuator would you use to show the temperature? (a) a display (b) a pump (c) a motor (d) a servo motor
24. 24.⚙️ Which actuator would you use to move water to plants? (a) a servo motor (b) a display (c) a motor (d) a pump
25. 25.⚙️ Which actuator would you use to beep an alarm? (a) a buzzer (b) a motor (c) a pump (d) a servo motor
26. 26.⚙️ Which actuator would you use to spin a robot’s wheels? (a) a motor (b) a pump (c) a display (d) a buzzer
27. 27.⚙️ What is an actuator? (a) a battery (b) an output that acts (c) a program (d) a sensor
28. 28.Which job needs a motor? (a) show the temperature (b) spin a robot’s wheels (c) turn to an exact angle (d) beep an alarm
29. 29.🔍 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?
30. 30.🔍 An object is 187 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
31. 31.True or false: to make a parking alarm, use a light sensor. (a) False (b) True
32. 32.Which job needs a buzzer? (a) beep an alarm (b) open a gate to 90° (c) show a status light (d) spin a robot’s wheels
33. 33.True or false: to start a fan when hot, use a temperature sensor. (a) True (b) False
34. 34.Which job needs a soil moisture sensor? (a) close a window in rain (b) keep an incubator warm (c) water a dry plant (d) warn of a gas leak
35. 35.True or false: to keep an incubator warm, use a sound sensor. (a) True (b) False
36. 36.🔍 Which sensor would you use to measure classroom noise? (a) a distance sensor (b) a light sensor (c) a sound sensor (d) a rain sensor
37. 37.True or false: to warn of a gas leak, use a temperature sensor. (a) False (b) True
38. 38.🔍 An object is 34 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
39. 39.True or false: to start a fan when hot, use a motion sensor. (a) True (b) False
40. 40.⚙️ Which actuator would you use to show a status light? (a) a motor (b) an LED (c) a pump (d) a servo motor

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