Electronics Worksheet: Sensors and Actuators

Electronics lesson 26: Sensors and actuators · Set 263 · 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.🔍 An object is 34 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
2. 2.Which job needs a display? (a) open a gate to 90° (b) move water to plants (c) beep an alarm (d) show the temperature
3. 3.⚙️ Which actuator would you use to show the temperature? (a) a display (b) an LED (c) a motor (d) a pump
4. 4.🔍 Which sensor would you use to water a dry plant? (a) a distance sensor (b) a rain sensor (c) a soil moisture sensor (d) a sound sensor
5. 5.Which job needs a motion sensor? (a) switch on lamps at dusk (b) spot someone walking in (c) measure classroom noise (d) warn of a gas leak
6. 6.⚙️ Which actuator would you use to move water to plants? (a) a motor (b) a pump (c) an LED (d) a display
7. 7.⚙️ Which actuator would you use to spin a robot’s wheels? (a) a servo motor (b) a buzzer (c) a display (d) a motor
8. 8.⚙️ What is an actuator? (a) a battery (b) an output that acts (c) a sensor (d) a program
9. 9.True or false: to open blinds at sunrise, use a sound sensor. (a) True (b) False
10. 10.Which job needs a servo motor? (a) beep an alarm (b) open a gate to 90° (c) move water to plants (d) spin a robot’s wheels
11. 11.True or false: to switch on lamps at dusk, use a light sensor. (a) False (b) True
12. 12.🔍 Which sensor would you use to open blinds at sunrise? (a) a temperature sensor (b) a gas sensor (c) a light sensor (d) a sound sensor
13. 13.True or false: to keep an incubator warm, use a temperature sensor. (a) True (b) False
14. 14.Which job needs a pump? (a) show a status light (b) turn to an exact angle (c) open a gate to 90° (d) move water to plants
15. 15.True or false: to switch on lamps at dusk, use a motion sensor. (a) True (b) False
16. 16.True or false: to measure classroom noise, use a temperature sensor. (a) True (b) False
17. 17.🔍 Which sensor would you use to switch on with a clap? (a) a temperature sensor (b) a light sensor (c) a sound sensor (d) a rain sensor
18. 18.True or false: to switch on with a clap, use a sound sensor. (a) False (b) True
19. 19.🔍 Which sensor would you use to close a window in rain? (a) a distance sensor (b) a rain sensor (c) a sound sensor (d) a soil moisture sensor
20. 20.🔍 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)?
21. 21.Which job needs a buzzer? (a) show a status light (b) spin a robot’s wheels (c) beep an alarm (d) turn to an exact angle
22. 22.Which job needs a soil moisture sensor? (a) measure classroom noise (b) warn of a gas leak (c) open blinds at sunrise (d) water a dry plant
23. 23.⚙️ Which actuator would you use to show a status light? (a) an LED (b) a display (c) a buzzer (d) a pump
24. 24.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
25. 25.🔍 Which sensor would you use to warn of a gas leak? (a) a temperature sensor (b) a gas sensor (c) a motion sensor (d) a light sensor
26. 26.True or false: to stop a robot near walls, use a sound sensor. (a) True (b) False
27. 27.🔍 An object is 68 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
28. 28.True or false: to close a window in rain, use a distance sensor. (a) True (b) False
29. 29.⚙️ Which actuator would you use to open a gate to 90°? (a) a pump (b) a buzzer (c) an LED (d) a servo motor
30. 30.🔍 Which sensor would you use to stop a robot near walls? (a) a gas sensor (b) a temperature sensor (c) a distance sensor (d) a motion sensor
31. 31.🔍 For a microcontroller, is a sensor an input or an output? (a) a fuse (b) an input (c) a power source (d) an output
32. 32.🔍 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)?
33. 33.True or false: to start a fan when hot, use a temperature sensor. (a) True (b) False
34. 34.🔍 Which sensor would you use to spot someone walking in? (a) a temperature sensor (b) a sound sensor (c) a motion sensor (d) a light sensor
35. 35.🔍 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?
36. 36.Which job needs a light sensor? (a) make a parking alarm (b) open blinds at sunrise (c) measure classroom noise (d) start a fan when hot
37. 37.⚙️ Which actuator would you use to beep an alarm? (a) a pump (b) a motor (c) an LED (d) a buzzer
38. 38.Which job needs a sound sensor? (a) water a dry plant (b) measure classroom noise (c) switch on lamps at dusk (d) keep an incubator warm
39. 39.🔍 Which sensor would you use to measure classroom noise? (a) a light sensor (b) a rain sensor (c) a sound sensor (d) a temperature sensor
40. 40.True or false: to close a window in rain, use a temperature sensor. (a) False (b) True

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