Electronics Worksheet: Sensors and Actuators

Electronics lesson 26: Sensors and actuators · Set 282 · 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 a light sensor? (a) stop a robot near walls (b) start a fan when hot (c) switch on lamps at dusk (d) measure classroom noise
2. 2.Which job needs a light sensor? (a) measure classroom noise (b) start a fan when hot (c) make a parking alarm (d) open blinds at sunrise
3. 3.🔍 Which sensor would you use to start a fan when hot? (a) a distance sensor (b) a gas sensor (c) a soil moisture sensor (d) a temperature sensor
4. 4.⚙️ What is an actuator? (a) a program (b) a battery (c) an output that acts (d) a sensor
5. 5.🔍 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?
6. 6.Which job needs a distance sensor? (a) switch on with a clap (b) warn of a gas leak (c) start a fan when hot (d) stop a robot near walls
7. 7.⚙️ Which actuator would you use to beep an alarm? (a) a buzzer (b) a pump (c) a servo motor (d) a motor
8. 8.🔍 For a microcontroller, is a sensor an input or an output? (a) an output (b) an input (c) a power source (d) a fuse
9. 9.True or false: to spot someone walking in, use a motion sensor. (a) True (b) False
10. 10.🔍 Which sensor would you use to stop a robot near walls? (a) a distance sensor (b) a rain sensor (c) a temperature sensor (d) a motion sensor
11. 11.🔍 An object is 136 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
12. 12.True or false: to spot someone walking in, use a gas sensor. (a) True (b) False
13. 13.Which job needs a soil moisture sensor? (a) close a window in rain (b) water a dry plant (c) start a fan when hot (d) measure classroom noise
14. 14.🔍 Which sensor would you use to switch on with a clap? (a) a motion sensor (b) a light sensor (c) a gas sensor (d) a sound sensor
15. 15.⚙️ Which actuator would you use to spin a robot’s wheels? (a) an LED (b) a motor (c) a pump (d) a servo motor
16. 16.🔍 Which sensor would you use to open blinds at sunrise? (a) a temperature sensor (b) a motion sensor (c) a rain sensor (d) a light sensor
17. 17.🔍 Which sensor would you use to warn of a gas leak? (a) a distance sensor (b) a motion sensor (c) a temperature sensor (d) a gas sensor
18. 18.🔍 An object is 221 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
19. 19.🔍 A distance sensor sends a sound pulse and hears the echo 13 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
20. 20.🔍 Which sensor would you use to close a window in rain? (a) a rain sensor (b) a distance sensor (c) a motion sensor (d) a gas sensor
21. 21.🔍 Which sensor would you use to spot someone walking in? (a) a motion sensor (b) a gas sensor (c) a rain sensor (d) a soil moisture sensor
22. 22.🔍 An object is 238 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
23. 23.⚙️ Which actuator would you use to show the temperature? (a) a display (b) an LED (c) a buzzer (d) a motor
24. 24.Which job needs a servo motor? (a) open a gate to 90° (b) show the temperature (c) spin a robot’s wheels (d) show a status light
25. 25.🔍 Which sensor would you use to switch on lamps at dusk? (a) a temperature sensor (b) a gas sensor (c) a soil moisture sensor (d) a light sensor
26. 26.⚙️ Which actuator would you use to open a gate to 90°? (a) a pump (b) a motor (c) a buzzer (d) a servo motor
27. 27.Which job needs a buzzer? (a) open a gate to 90° (b) move water to plants (c) show a status light (d) beep an alarm
28. 28.Which job needs an LED? (a) show the temperature (b) move water to plants (c) open a gate to 90° (d) show a status light
29. 29.Which job needs a sound sensor? (a) keep an incubator warm (b) switch on with a clap (c) switch on lamps at dusk (d) open blinds at sunrise
30. 30.True or false: to make a parking alarm, use a distance sensor. (a) False (b) True
31. 31.True or false: to close a window in rain, use a gas sensor. (a) True (b) False
32. 32.True or false: to measure classroom noise, use a sound sensor. (a) False (b) True
33. 33.🔍 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?
34. 34.🔍 An object is 170 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
35. 35.True or false: to start a fan when hot, use a temperature sensor. (a) True (b) False
36. 36.🔍 Which sensor would you use to water a dry plant? (a) a gas sensor (b) a light sensor (c) a temperature sensor (d) a soil moisture sensor
37. 37.🔍 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)?
38. 38.🔍 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?
39. 39.True or false: to switch on lamps at dusk, use a light sensor. (a) False (b) True
40. 40.Which job needs a motor? (a) show the temperature (b) turn to an exact angle (c) spin a robot’s wheels (d) show a status light

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