Electronics Worksheet: Sensors and Actuators

Electronics lesson 26: Sensors and actuators · Set 320 · 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 sensor would you use to open blinds at sunrise? (a) a rain sensor (b) a temperature sensor (c) a light sensor (d) a gas sensor
2. 2.⚙️ Which actuator would you use to spin a robot’s wheels? (a) a servo motor (b) a buzzer (c) a pump (d) a motor
3. 3.True or false: to warn of a gas leak, use a gas sensor. (a) True (b) False
4. 4.Which job needs a soil moisture sensor? (a) keep an incubator warm (b) switch on with a clap (c) open blinds at sunrise (d) water a dry plant
5. 5.True or false: to spot someone walking in, use a motion sensor. (a) False (b) True
6. 6.True or false: to measure classroom noise, use a sound sensor. (a) True (b) False
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.Which job needs a gas sensor? (a) switch on with a clap (b) open blinds at sunrise (c) make a parking alarm (d) warn of a gas leak
9. 9.Which job needs a servo motor? (a) move water to plants (b) show a status light (c) open a gate to 90° (d) beep an alarm
10. 10.🔍 Which sensor would you use to make a parking alarm? (a) a light sensor (b) a temperature sensor (c) a distance sensor (d) a motion sensor
11. 11.🔍 Which sensor would you use to keep an incubator warm? (a) a soil moisture sensor (b) a distance sensor (c) a temperature sensor (d) a motion sensor
12. 12.⚙️ What is an actuator? (a) a program (b) an output that acts (c) a battery (d) a sensor
13. 13.⚙️ Which actuator would you use to turn to an exact angle? (a) a servo motor (b) a pump (c) a display (d) a buzzer
14. 14.🔍 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)?
15. 15.True or false: to start a fan when hot, use a temperature sensor. (a) True (b) False
16. 16.⚙️ Which actuator would you use to show a status light? (a) a pump (b) a buzzer (c) an LED (d) a motor
17. 17.🔍 Which sensor would you use to water a dry plant? (a) a light sensor (b) a distance sensor (c) a rain sensor (d) a soil moisture sensor
18. 18.Which job needs a temperature sensor? (a) keep an incubator warm (b) water a dry plant (c) make a parking alarm (d) warn of a gas leak
19. 19.🔍 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?
20. 20.True or false: to switch on lamps at dusk, use a sound sensor. (a) True (b) False
21. 21.🔍 A distance sensor sends a sound pulse and hears the echo 17 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
22. 22.🔍 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?
23. 23.Which job needs a light sensor? (a) spot someone walking in (b) switch on lamps at dusk (c) switch on with a clap (d) start a fan when hot
24. 24.🔍 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?
25. 25.True or false: to switch on lamps at dusk, use a rain sensor. (a) False (b) True
26. 26.Which job needs a servo motor? (a) turn to an exact angle (b) show a status light (c) spin a robot’s wheels (d) beep an alarm
27. 27.Which job needs a motor? (a) turn to an exact angle (b) move water to plants (c) spin a robot’s wheels (d) open a gate to 90°
28. 28.True or false: to start a fan when hot, use a gas sensor. (a) False (b) True
29. 29.Which job needs a pump? (a) show a status light (b) spin a robot’s wheels (c) move water to plants (d) open a gate to 90°
30. 30.🔍 Which sensor would you use to warn of a gas leak? (a) a rain sensor (b) a temperature sensor (c) a gas sensor (d) a distance sensor
31. 31.🔍 For a microcontroller, is a sensor an input or an output? (a) an output (b) a fuse (c) a power source (d) an input
32. 32.True or false: to keep an incubator warm, use a motion sensor. (a) True (b) False
33. 33.Which job needs a rain sensor? (a) close a window in rain (b) warn of a gas leak (c) spot someone walking in (d) water a dry plant
34. 34.🔍 A distance sensor sends a sound pulse and hears the echo 7 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
35. 35.Which job needs a display? (a) open a gate to 90° (b) beep an alarm (c) spin a robot’s wheels (d) show the temperature
36. 36.True or false: to open blinds at sunrise, use a light sensor. (a) True (b) False
37. 37.🔍 A distance sensor sends a sound pulse and hears the echo 3 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
38. 38.🔍 A distance sensor sends a sound pulse and hears the echo 3 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
39. 39.True or false: to switch on lamps at dusk, use a distance sensor. (a) True (b) False
40. 40.⚙️ Which actuator would you use to show the temperature? (a) a display (b) a servo motor (c) an LED (d) a pump

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