Electronics Worksheet: Sensors and Actuators

Electronics lesson 26: Sensors and actuators · Set 336 · 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.True or false: to warn of a gas leak, use a gas sensor. (a) False (b) True
2. 2.Which job needs a servo motor? (a) turn to an exact angle (b) show the temperature (c) move water to plants (d) beep an alarm
3. 3.⚙️ Which actuator would you use to turn to an exact angle? (a) a pump (b) a motor (c) a servo motor (d) a buzzer
4. 4.⚙️ What is an actuator? (a) a sensor (b) a battery (c) a program (d) an output that acts
5. 5.⚙️ Which actuator would you use to beep an alarm? (a) an LED (b) a pump (c) a motor (d) a buzzer
6. 6.Which job needs a buzzer? (a) show the temperature (b) open a gate to 90° (c) spin a robot’s wheels (d) beep an alarm
7. 7.🔍 Which sensor would you use to keep an incubator warm? (a) a temperature sensor (b) a motion sensor (c) a rain sensor (d) a gas sensor
8. 8.True or false: to start a fan when hot, use a temperature sensor. (a) True (b) False
9. 9.Which job needs a soil moisture sensor? (a) spot someone walking in (b) switch on with a clap (c) water a dry plant (d) warn of a gas leak
10. 10.True or false: to open blinds at sunrise, use a motion sensor. (a) True (b) False
11. 11.🔍 Which sensor would you use to measure classroom noise? (a) a light sensor (b) a motion sensor (c) a temperature sensor (d) a sound sensor
12. 12.🔍 For a microcontroller, is a sensor an input or an output? (a) an output (b) a power source (c) an input (d) a fuse
13. 13.⚙️ Which actuator would you use to spin a robot’s wheels? (a) a pump (b) a servo motor (c) a motor (d) a buzzer
14. 14.🔍 Which sensor would you use to open blinds at sunrise? (a) a rain sensor (b) a motion sensor (c) a light sensor (d) a temperature sensor
15. 15.🔍 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?
16. 16.🔍 Which sensor would you use to switch on lamps at dusk? (a) a distance sensor (b) a motion sensor (c) a temperature sensor (d) a light sensor
17. 17.🔍 A distance sensor sends a sound pulse and hears the echo 17 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
18. 18.True or false: to open blinds at sunrise, use a light sensor. (a) True (b) False
19. 19.True or false: to start a fan when hot, use a soil moisture sensor. (a) True (b) False
20. 20.Which job needs a light sensor? (a) spot someone walking in (b) open blinds at sunrise (c) start a fan when hot (d) measure classroom noise
21. 21.⚙️ Which actuator would you use to show the temperature? (a) a pump (b) a display (c) a buzzer (d) a motor
22. 22.🔍 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)?
23. 23.Which job needs an LED? (a) move water to plants (b) turn to an exact angle (c) spin a robot’s wheels (d) show a status light
24. 24.🔍 Which sensor would you use to switch on with a clap? (a) a motion sensor (b) a sound sensor (c) a rain sensor (d) a light sensor
25. 25.🔍 Which sensor would you use to spot someone walking in? (a) a light sensor (b) a motion sensor (c) a temperature sensor (d) a soil moisture sensor
26. 26.🔍 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?
27. 27.True or false: to switch on with a clap, use a soil moisture sensor. (a) False (b) True
28. 28.🔍 A distance sensor sends a sound pulse and hears the echo 9 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
29. 29.Which job needs a motor? (a) spin a robot’s wheels (b) show a status light (c) open a gate to 90° (d) turn to an exact angle
30. 30.True or false: to switch on with a clap, use a light sensor. (a) False (b) True
31. 31.🔍 Which sensor would you use to stop a robot near walls? (a) a sound sensor (b) a gas sensor (c) a light sensor (d) a distance sensor
32. 32.Which job needs a servo motor? (a) open a gate to 90° (b) show the temperature (c) show a status light (d) move water to plants
33. 33.🔍 An object is 255 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
34. 34.🔍 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)?
35. 35.Which job needs a temperature sensor? (a) warn of a gas leak (b) keep an incubator warm (c) switch on lamps at dusk (d) open blinds at sunrise
36. 36.Which job needs a gas sensor? (a) warn of a gas leak (b) make a parking alarm (c) water a dry plant (d) keep an incubator warm
37. 37.🔍 A distance sensor sends a sound pulse and hears the echo 7 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
38. 38.Which job needs a rain sensor? (a) measure classroom noise (b) switch on lamps at dusk (c) close a window in rain (d) make a parking alarm
39. 39.True or false: to spot someone walking in, use a motion sensor. (a) True (b) False
40. 40.Which job needs a motion sensor? (a) make a parking alarm (b) stop a robot near walls (c) spot someone walking in (d) switch on with a clap

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