Electronics Worksheet: Sensors and Actuators

Electronics lesson 26: Sensors and actuators · Set 183 · 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 job needs an LED? (a) show a status light (b) beep an alarm (c) spin a robot’s wheels (d) turn to an exact angle
2. 2.⚙️ What is an actuator? (a) a program (b) a sensor (c) a battery (d) an output that acts
3. 3.⚙️ Which actuator would you use to show a status light? (a) a display (b) a servo motor (c) an LED (d) a pump
4. 4.⚙️ Which actuator would you use to open a gate to 90°? (a) a pump (b) a buzzer (c) a servo motor (d) a motor
5. 5.🔍 For a microcontroller, is a sensor an input or an output? (a) an output (b) an input (c) a fuse (d) a power source
6. 6.🔍 Which sensor would you use to switch on with a clap? (a) a temperature sensor (b) a sound sensor (c) a light sensor (d) a soil moisture sensor
7. 7.🔍 An object is 102 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
8. 8.Which job needs a motor? (a) open a gate to 90° (b) spin a robot’s wheels (c) beep an alarm (d) show a status light
9. 9.Which job needs a display? (a) spin a robot’s wheels (b) show the temperature (c) open a gate to 90° (d) show a status light
10. 10.Which job needs a distance sensor? (a) spot someone walking in (b) water a dry plant (c) open blinds at sunrise (d) stop a robot near walls
11. 11.🔍 An object is 119 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
12. 12.Which job needs a temperature sensor? (a) open blinds at sunrise (b) stop a robot near walls (c) warn of a gas leak (d) start a fan when hot
13. 13.⚙️ Which actuator would you use to move water to plants? (a) a servo motor (b) a buzzer (c) a display (d) a pump
14. 14.Which job needs a rain sensor? (a) close a window in rain (b) switch on lamps at dusk (c) make a parking alarm (d) keep an incubator warm
15. 15.True or false: to warn of a gas leak, use a rain sensor. (a) True (b) False
16. 16.True or false: to open blinds at sunrise, use a distance sensor. (a) False (b) True
17. 17.Which job needs a buzzer? (a) move water to plants (b) spin a robot’s wheels (c) beep an alarm (d) show the temperature
18. 18.🔍 Which sensor would you use to stop a robot near walls? (a) a distance sensor (b) a motion sensor (c) a light sensor (d) a soil moisture sensor
19. 19.Which job needs a motion sensor? (a) spot someone walking in (b) start a fan when hot (c) measure classroom noise (d) keep an incubator warm
20. 20.⚙️ Which actuator would you use to turn to an exact angle? (a) a motor (b) an LED (c) a servo motor (d) a display
21. 21.🔍 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?
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 servo motor? (a) show a status light (b) spin a robot’s wheels (c) beep an alarm (d) turn to an exact angle
24. 24.🔍 A distance sensor sends a sound pulse and hears the echo 5 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
25. 25.🔍 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)?
26. 26.Which job needs a servo motor? (a) spin a robot’s wheels (b) open a gate to 90° (c) show the temperature (d) move water to plants
27. 27.🔍 Which sensor would you use to close a window in rain? (a) a rain sensor (b) a light sensor (c) a sound sensor (d) a distance sensor
28. 28.True or false: to water a dry plant, use a rain sensor. (a) True (b) False
29. 29.True or false: to switch on lamps at dusk, use a motion sensor. (a) False (b) True
30. 30.True or false: to switch on lamps at dusk, use a light sensor. (a) False (b) True
31. 31.🔍 Which sensor would you use to keep an incubator warm? (a) a rain sensor (b) a distance sensor (c) a gas sensor (d) a temperature sensor
32. 32.⚙️ Which actuator would you use to beep an alarm? (a) an LED (b) a motor (c) a buzzer (d) a servo motor
33. 33.⚙️ Which actuator would you use to spin a robot’s wheels? (a) a pump (b) a buzzer (c) a motor (d) an LED
34. 34.🔍 Which sensor would you use to warn of a gas leak? (a) a gas sensor (b) a sound sensor (c) a soil moisture sensor (d) a temperature sensor
35. 35.Which job needs a distance sensor? (a) measure classroom noise (b) switch on with a clap (c) make a parking alarm (d) warn of a gas leak
36. 36.True or false: to measure classroom noise, use a sound sensor. (a) True (b) False
37. 37.Which job needs a pump? (a) show the temperature (b) turn to an exact angle (c) move water to plants (d) beep an alarm
38. 38.🔍 Which sensor would you use to start a fan when hot? (a) a distance sensor (b) a light sensor (c) a temperature sensor (d) a gas sensor
39. 39.True or false: to stop a robot near walls, use a rain sensor. (a) False (b) True
40. 40.Which job needs a soil moisture sensor? (a) open blinds at sunrise (b) stop a robot near walls (c) keep an incubator warm (d) water a dry plant

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