Electronics Worksheet: Sensors and Actuators

Electronics lesson 26: Sensors and actuators · Set 295 · 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 servo motor (b) a motor (c) an LED (d) a buzzer
2. 2.Which job needs a pump? (a) show the temperature (b) spin a robot’s wheels (c) open a gate to 90° (d) move water to plants
3. 3.Which job needs a distance sensor? (a) switch on with a clap (b) close a window in rain (c) make a parking alarm (d) switch on lamps at dusk
4. 4.Which job needs a soil moisture sensor? (a) open blinds at sunrise (b) keep an incubator warm (c) water a dry plant (d) warn of a gas leak
5. 5.⚙️ Which actuator would you use to open a gate to 90°? (a) an LED (b) a display (c) a buzzer (d) a servo motor
6. 6.⚙️ Which actuator would you use to show the temperature? (a) a motor (b) a display (c) a pump (d) a servo motor
7. 7.Which job needs a motion sensor? (a) warn of a gas leak (b) spot someone walking in (c) open blinds at sunrise (d) keep an incubator warm
8. 8.🔍 For a microcontroller, is a sensor an input or an output? (a) a power source (b) an output (c) an input (d) a fuse
9. 9.Which job needs an LED? (a) open a gate to 90° (b) turn to an exact angle (c) show a status light (d) spin a robot’s wheels
10. 10.Which job needs a display? (a) move water to plants (b) turn to an exact angle (c) show the temperature (d) spin a robot’s wheels
11. 11.True or false: to stop a robot near walls, use a temperature sensor. (a) True (b) False
12. 12.Which job needs a light sensor? (a) open blinds at sunrise (b) stop a robot near walls (c) measure classroom noise (d) spot someone walking in
13. 13.Which job needs a motor? (a) spin a robot’s wheels (b) show a status light (c) open a gate to 90° (d) show the temperature
14. 14.🔍 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?
15. 15.Which job needs a servo motor? (a) spin a robot’s wheels (b) show a status light (c) open a gate to 90° (d) move water to plants
16. 16.Which job needs a temperature sensor? (a) switch on with a clap (b) start a fan when hot (c) switch on lamps at dusk (d) close a window in rain
17. 17.True or false: to warn of a gas leak, use a sound sensor. (a) True (b) False
18. 18.🔍 Which sensor would you use to open blinds at sunrise? (a) a temperature sensor (b) a distance sensor (c) a light sensor (d) a soil moisture sensor
19. 19.🔍 Which sensor would you use to spot someone walking in? (a) a distance sensor (b) a light sensor (c) a rain sensor (d) a motion sensor
20. 20.⚙️ Which actuator would you use to move water to plants? (a) a motor (b) a pump (c) a display (d) an LED
21. 21.Which job needs a servo motor? (a) show a status light (b) beep an alarm (c) turn to an exact angle (d) show the temperature
22. 22.True or false: to warn of a gas leak, use a gas sensor. (a) False (b) True
23. 23.Which job needs a gas sensor? (a) stop a robot near walls (b) start a fan when hot (c) make a parking alarm (d) warn of a gas leak
24. 24.🔍 Which sensor would you use to switch on lamps at dusk? (a) a light sensor (b) a temperature sensor (c) a distance sensor (d) a rain sensor
25. 25.⚙️ Which actuator would you use to beep an alarm? (a) a motor (b) an LED (c) a buzzer (d) a pump
26. 26.Which job needs a buzzer? (a) move water to plants (b) show the temperature (c) beep an alarm (d) open a gate to 90°
27. 27.⚙️ What is an actuator? (a) a battery (b) a sensor (c) an output that acts (d) a program
28. 28.🔍 Which sensor would you use to start a fan when hot? (a) a light sensor (b) a motion sensor (c) a temperature sensor (d) a sound sensor
29. 29.🔍 Which sensor would you use to stop a robot near walls? (a) a sound sensor (b) a rain sensor (c) a light sensor (d) a distance sensor
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 spot someone walking in, use a rain sensor. (a) True (b) False
32. 32.🔍 A distance sensor sends a sound pulse and hears the echo 14 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
33. 33.⚙️ Which actuator would you use to show a status light? (a) a buzzer (b) a motor (c) an LED (d) a servo motor
34. 34.True or false: to close a window in rain, use a rain sensor. (a) True (b) False
35. 35.True or false: to switch on lamps at dusk, use a distance sensor. (a) False (b) True
36. 36.🔍 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)?
37. 37.True or false: to switch on lamps at dusk, use a motion sensor. (a) False (b) True
38. 38.🔍 A distance sensor sends a sound pulse and hears the echo 11 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
39. 39.🔍 An object is 85 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
40. 40.Which job needs a sound sensor? (a) close a window in rain (b) switch on lamps at dusk (c) start a fan when hot (d) switch on with a clap

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