Electronics Worksheet: Sensors and Actuators

Electronics lesson 26: Sensors and actuators · Set 134 · 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 motor (b) a pump (c) a display (d) an LED
2. 2.🔍 For a microcontroller, is a sensor an input or an output? (a) an output (b) a power source (c) an input (d) a fuse
3. 3.Which job needs a distance sensor? (a) make a parking alarm (b) warn of a gas leak (c) keep an incubator warm (d) spot someone walking in
4. 4.🔍 Which sensor would you use to stop a robot near walls? (a) a gas sensor (b) a sound sensor (c) a distance sensor (d) a soil moisture sensor
5. 5.🔍 An object is 323 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
6. 6.⚙️ What is an actuator? (a) a program (b) a sensor (c) an output that acts (d) a battery
7. 7.Which job needs an LED? (a) turn to an exact angle (b) move water to plants (c) show a status light (d) spin a robot’s wheels
8. 8.🔍 A distance sensor sends a sound pulse and hears the echo 20 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
9. 9.⚙️ Which actuator would you use to turn to an exact angle? (a) an LED (b) a pump (c) a motor (d) a servo motor
10. 10.True or false: to close a window in rain, use a soil moisture sensor. (a) True (b) False
11. 11.🔍 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)?
12. 12.🔍 Which sensor would you use to close a window in rain? (a) a sound sensor (b) a temperature sensor (c) a rain sensor (d) a motion sensor
13. 13.Which job needs a light sensor? (a) open blinds at sunrise (b) start a fan when hot (c) spot someone walking in (d) stop a robot near walls
14. 14.Which job needs a servo motor? (a) spin a robot’s wheels (b) open a gate to 90° (c) beep an alarm (d) move water to plants
15. 15.⚙️ Which actuator would you use to open a gate to 90°? (a) a buzzer (b) a motor (c) a pump (d) a servo motor
16. 16.🔍 An object is 306 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
17. 17.Which job needs a temperature sensor? (a) water a dry plant (b) stop a robot near walls (c) close a window in rain (d) keep an incubator warm
18. 18.Which job needs a rain sensor? (a) start a fan when hot (b) open blinds at sunrise (c) warn of a gas leak (d) close a window in rain
19. 19.True or false: to make a parking alarm, use a distance sensor. (a) True (b) False
20. 20.Which job needs a motor? (a) show the temperature (b) move water to plants (c) turn to an exact angle (d) spin a robot’s wheels
21. 21.True or false: to open blinds at sunrise, use a light sensor. (a) True (b) False
22. 22.Which job needs a soil moisture sensor? (a) warn of a gas leak (b) close a window in rain (c) spot someone walking in (d) water a dry plant
23. 23.True or false: to switch on with a clap, use a rain sensor. (a) False (b) True
24. 24.Which job needs a buzzer? (a) spin a robot’s wheels (b) beep an alarm (c) show a status light (d) open a gate to 90°
25. 25.🔍 Which sensor would you use to keep an incubator warm? (a) a rain sensor (b) a light sensor (c) a temperature sensor (d) a distance sensor
26. 26.⚙️ Which actuator would you use to show a status light? (a) a buzzer (b) a motor (c) an LED (d) a pump
27. 27.Which job needs a sound sensor? (a) keep an incubator warm (b) stop a robot near walls (c) measure classroom noise (d) warn of a gas leak
28. 28.True or false: to water a dry plant, use a soil moisture sensor. (a) False (b) True
29. 29.⚙️ Which actuator would you use to beep an alarm? (a) a motor (b) a buzzer (c) a display (d) a pump
30. 30.Which job needs a display? (a) spin a robot’s wheels (b) show a status light (c) move water to plants (d) show the temperature
31. 31.🔍 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?
32. 32.🔍 Which sensor would you use to switch on with a clap? (a) a distance sensor (b) a gas sensor (c) a sound sensor (d) a soil moisture sensor
33. 33.Which job needs a distance sensor? (a) water a dry plant (b) switch on lamps at dusk (c) stop a robot near walls (d) warn of a gas leak
34. 34.True or false: to stop a robot near walls, use a rain sensor. (a) True (b) False
35. 35.True or false: to start a fan when hot, use a temperature sensor. (a) True (b) False
36. 36.Which job needs a servo motor? (a) show the temperature (b) beep an alarm (c) turn to an exact angle (d) spin a robot’s wheels
37. 37.🔍 Which sensor would you use to open blinds at sunrise? (a) a sound sensor (b) a gas sensor (c) a distance sensor (d) a light sensor
38. 38.True or false: to switch on with a clap, use a sound sensor. (a) True (b) False
39. 39.True or false: to keep an incubator warm, use a gas sensor. (a) True (b) False
40. 40.🔍 Which sensor would you use to warn of a gas leak? (a) a light sensor (b) a gas sensor (c) a soil moisture sensor (d) a rain sensor

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