Electronics Worksheet: Sensors and Actuators

Electronics lesson 26: Sensors and actuators · Set 174 · 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.⚙️ What is an actuator? (a) an output that acts (b) a sensor (c) a battery (d) a program
2. 2.Which job needs a rain sensor? (a) stop a robot near walls (b) water a dry plant (c) close a window in rain (d) measure classroom noise
3. 3.Which job needs a buzzer? (a) beep an alarm (b) turn to an exact angle (c) open a gate to 90° (d) show a status light
4. 4.🔍 Which sensor would you use to stop a robot near walls? (a) a distance sensor (b) a gas sensor (c) a temperature sensor (d) a sound sensor
5. 5.Which job needs an LED? (a) spin a robot’s wheels (b) turn to an exact angle (c) open a gate to 90° (d) show a status light
6. 6.🔍 Which sensor would you use to warn of a gas leak? (a) a gas sensor (b) a light sensor (c) a rain sensor (d) a temperature sensor
7. 7.🔍 For a microcontroller, is a sensor an input or an output? (a) an input (b) a power source (c) a fuse (d) an output
8. 8.True or false: to switch on lamps at dusk, use a distance sensor. (a) True (b) False
9. 9.True or false: to switch on with a clap, use a distance sensor. (a) False (b) True
10. 10.True or false: to open blinds at sunrise, use a sound sensor. (a) False (b) True
11. 11.⚙️ Which actuator would you use to turn to an exact angle? (a) a buzzer (b) a pump (c) a motor (d) a servo motor
12. 12.Which job needs a light sensor? (a) open blinds at sunrise (b) switch on with a clap (c) keep an incubator warm (d) water a dry plant
13. 13.⚙️ Which actuator would you use to open a gate to 90°? (a) a servo motor (b) a pump (c) an LED (d) a display
14. 14.True or false: to switch on lamps at dusk, use a light sensor. (a) False (b) True
15. 15.🔍 Which sensor would you use to spot someone walking in? (a) a sound sensor (b) a light sensor (c) a soil moisture sensor (d) a motion sensor
16. 16.Which job needs a temperature sensor? (a) make a parking alarm (b) switch on with a clap (c) start a fan when hot (d) open blinds at sunrise
17. 17.Which job needs a servo motor? (a) show a status light (b) show the temperature (c) open a gate to 90° (d) beep an alarm
18. 18.🔍 Which sensor would you use to water a dry plant? (a) a sound sensor (b) a soil moisture sensor (c) a gas sensor (d) a rain sensor
19. 19.🔍 A distance sensor sends a sound pulse and hears the echo 1 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
20. 20.🔍 An object is 289 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 a motion sensor? (a) warn of a gas leak (b) water a dry plant (c) spot someone walking in (d) open blinds at sunrise
22. 22.True or false: to stop a robot near walls, use a motion sensor. (a) True (b) False
23. 23.Which job needs a sound sensor? (a) switch on lamps at dusk (b) keep an incubator warm (c) water a dry plant (d) measure classroom noise
24. 24.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
25. 25.🔍 Which sensor would you use to open blinds at sunrise? (a) a soil moisture sensor (b) a light sensor (c) a distance sensor (d) a sound sensor
26. 26.🔍 Which sensor would you use to start a fan when hot? (a) a temperature sensor (b) a sound sensor (c) a light sensor (d) a gas sensor
27. 27.🔍 Which sensor would you use to keep an incubator warm? (a) a gas sensor (b) a light sensor (c) a distance sensor (d) a temperature sensor
28. 28.True or false: to warn of a gas leak, use a gas sensor. (a) False (b) True
29. 29.🔍 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)?
30. 30.⚙️ Which actuator would you use to move water to plants? (a) a buzzer (b) a pump (c) an LED (d) a display
31. 31.Which job needs a pump? (a) spin a robot’s wheels (b) turn to an exact angle (c) show the temperature (d) move water to plants
32. 32.Which job needs a distance sensor? (a) stop a robot near walls (b) open blinds at sunrise (c) water a dry plant (d) warn of a gas leak
33. 33.True or false: to start a fan when hot, use a temperature sensor. (a) False (b) True
34. 34.Which job needs a motor? (a) show a status light (b) turn to an exact angle (c) spin a robot’s wheels (d) open a gate to 90°
35. 35.Which job needs a temperature sensor? (a) spot someone walking in (b) stop a robot near walls (c) switch on with a clap (d) keep an incubator warm
36. 36.⚙️ Which actuator would you use to show the temperature? (a) a pump (b) a display (c) a motor (d) a buzzer
37. 37.🔍 A distance sensor sends a sound pulse and hears the echo 9 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
38. 38.True or false: to stop a robot near walls, use a distance sensor. (a) False (b) True
39. 39.🔍 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?
40. 40.🔍 Which sensor would you use to switch on lamps at dusk? (a) a motion sensor (b) a light sensor (c) a sound sensor (d) a temperature sensor

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