Electronics Worksheet: Sensors and Actuators

Electronics lesson 26: Sensors and actuators · Set 173 · 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 beep an alarm? (a) a pump (b) a buzzer (c) a servo motor (d) a display
2. 2.Which job needs a pump? (a) beep an alarm (b) turn to an exact angle (c) spin a robot’s wheels (d) move water to plants
3. 3.Which job needs a servo motor? (a) open a gate to 90° (b) show the temperature (c) move water to plants (d) show a status light
4. 4.Which job needs a soil moisture sensor? (a) stop a robot near walls (b) water a dry plant (c) start a fan when hot (d) switch on lamps at dusk
5. 5.Which job needs an LED? (a) show a status light (b) open a gate to 90° (c) beep an alarm (d) move water to plants
6. 6.🔍 Which sensor would you use to open blinds at sunrise? (a) a gas sensor (b) a soil moisture sensor (c) a light sensor (d) a rain sensor
7. 7.Which job needs a motion sensor? (a) warn of a gas leak (b) switch on lamps at dusk (c) start a fan when hot (d) spot someone walking in
8. 8.🔍 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)?
9. 9.🔍 An object is 51 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
10. 10.Which job needs a temperature sensor? (a) make a parking alarm (b) open blinds at sunrise (c) switch on with a clap (d) start a fan when hot
11. 11.🔍 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)?
12. 12.Which job needs a temperature sensor? (a) keep an incubator warm (b) warn of a gas leak (c) measure classroom noise (d) switch on lamps at dusk
13. 13.⚙️ What is an actuator? (a) a battery (b) a sensor (c) an output that acts (d) a program
14. 14.⚙️ Which actuator would you use to spin a robot’s wheels? (a) an LED (b) a display (c) a buzzer (d) a motor
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.🔍 For a microcontroller, is a sensor an input or an output? (a) an input (b) a power source (c) an output (d) a fuse
17. 17.🔍 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?
18. 18.⚙️ Which actuator would you use to turn to an exact angle? (a) an LED (b) a servo motor (c) a motor (d) a buzzer
19. 19.🔍 An object is 153 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
20. 20.Which job needs a distance sensor? (a) close a window in rain (b) spot someone walking in (c) stop a robot near walls (d) switch on lamps at dusk
21. 21.🔍 Which sensor would you use to start a fan when hot? (a) a gas sensor (b) a temperature sensor (c) a motion sensor (d) a soil moisture sensor
22. 22.🔍 An object is 17 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
23. 23.Which job needs a rain sensor? (a) start a fan when hot (b) close a window in rain (c) spot someone walking in (d) measure classroom noise
24. 24.🔍 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)?
25. 25.Which job needs a distance sensor? (a) water a dry plant (b) close a window in rain (c) warn of a gas leak (d) make a parking alarm
26. 26.Which job needs a gas sensor? (a) warn of a gas leak (b) water a dry plant (c) switch on with a clap (d) switch on lamps at dusk
27. 27.🔍 Which sensor would you use to warn of a gas leak? (a) a gas sensor (b) a sound sensor (c) a temperature sensor (d) a distance sensor
28. 28.Which job needs a display? (a) move water to plants (b) beep an alarm (c) open a gate to 90° (d) show the temperature
29. 29.🔍 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?
30. 30.🔍 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)?
31. 31.True or false: to warn of a gas leak, use a soil moisture sensor. (a) True (b) False
32. 32.Which job needs a motor? (a) open a gate to 90° (b) show a status light (c) spin a robot’s wheels (d) show the temperature
33. 33.Which job needs a sound sensor? (a) stop a robot near walls (b) open blinds at sunrise (c) start a fan when hot (d) measure classroom noise
34. 34.Which job needs a light sensor? (a) spot someone walking in (b) water a dry plant (c) switch on with a clap (d) open blinds at sunrise
35. 35.Which job needs a light sensor? (a) close a window in rain (b) start a fan when hot (c) switch on lamps at dusk (d) keep an incubator warm
36. 36.Which job needs a servo motor? (a) beep an alarm (b) show a status light (c) turn to an exact angle (d) move water to plants
37. 37.True or false: to make a parking alarm, use a temperature sensor. (a) False (b) True
38. 38.⚙️ Which actuator would you use to show the temperature? (a) a buzzer (b) a servo motor (c) a display (d) a motor
39. 39.🔍 Which sensor would you use to spot someone walking in? (a) a gas sensor (b) a soil moisture sensor (c) a motion sensor (d) a sound sensor
40. 40.🔍 Which sensor would you use to keep an incubator warm? (a) a motion sensor (b) a distance sensor (c) a temperature sensor (d) a light sensor

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