Electronics Worksheet: Sensors and Actuators

Electronics lesson 26: Sensors and actuators · Set 325 · 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 motor? (a) show the temperature (b) open a gate to 90° (c) spin a robot’s wheels (d) beep an alarm
2. 2.Which job needs an LED? (a) show a status light (b) turn to an exact angle (c) beep an alarm (d) open a gate to 90°
3. 3.🔍 Which sensor would you use to switch on with a clap? (a) a temperature sensor (b) a distance sensor (c) a sound sensor (d) a light sensor
4. 4.Which job needs a light sensor? (a) make a parking alarm (b) switch on with a clap (c) open blinds at sunrise (d) close a window in rain
5. 5.Which job needs a gas sensor? (a) make a parking alarm (b) switch on lamps at dusk (c) open blinds at sunrise (d) warn of a gas leak
6. 6.True or false: to switch on lamps at dusk, use a sound sensor. (a) False (b) True
7. 7.⚙️ What is an actuator? (a) a program (b) a sensor (c) an output that acts (d) a battery
8. 8.True or false: to water a dry plant, use a gas sensor. (a) True (b) False
9. 9.🔍 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)?
10. 10.🔍 Which sensor would you use to keep an incubator warm? (a) a soil moisture sensor (b) a rain sensor (c) a sound sensor (d) a temperature sensor
11. 11.Which job needs a rain sensor? (a) close a window in rain (b) switch on lamps at dusk (c) start a fan when hot (d) make a parking alarm
12. 12.🔍 An object is 272 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
13. 13.🔍 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)?
14. 14.Which job needs a motion sensor? (a) stop a robot near walls (b) switch on lamps at dusk (c) keep an incubator warm (d) spot someone walking in
15. 15.True or false: to stop a robot near walls, use a sound sensor. (a) True (b) False
16. 16.🔍 For a microcontroller, is a sensor an input or an output? (a) a fuse (b) a power source (c) an output (d) an input
17. 17.Which job needs a soil moisture sensor? (a) start a fan when hot (b) make a parking alarm (c) water a dry plant (d) switch on with a clap
18. 18.🔍 Which sensor would you use to stop a robot near walls? (a) a temperature sensor (b) a gas sensor (c) a sound sensor (d) a distance sensor
19. 19.🔍 Which sensor would you use to make a parking alarm? (a) a light sensor (b) a sound sensor (c) a motion sensor (d) a distance sensor
20. 20.Which job needs a servo motor? (a) show a status light (b) beep an alarm (c) open a gate to 90° (d) move water to plants
21. 21.Which job needs a temperature sensor? (a) spot someone walking in (b) keep an incubator warm (c) switch on lamps at dusk (d) open blinds at sunrise
22. 22.🔍 Which sensor would you use to close a window in rain? (a) a distance sensor (b) a gas sensor (c) a rain sensor (d) a light sensor
23. 23.Which job needs a sound sensor? (a) measure classroom noise (b) close a window in rain (c) start a fan when hot (d) warn of a gas leak
24. 24.⚙️ Which actuator would you use to turn to an exact angle? (a) a display (b) a servo motor (c) a buzzer (d) a pump
25. 25.🔍 A distance sensor sends a sound pulse and hears the echo 16 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
26. 26.True or false: to measure classroom noise, use a motion sensor. (a) False (b) True
27. 27.🔍 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?
28. 28.Which job needs a pump? (a) turn to an exact angle (b) show the temperature (c) move water to plants (d) spin a robot’s wheels
29. 29.Which job needs a light sensor? (a) switch on lamps at dusk (b) keep an incubator warm (c) water a dry plant (d) switch on with a clap
30. 30.True or false: to switch on lamps at dusk, use a distance sensor. (a) True (b) False
31. 31.🔍 Which sensor would you use to switch on lamps at dusk? (a) a sound sensor (b) a temperature sensor (c) a light sensor (d) a rain sensor
32. 32.🔍 Which sensor would you use to open blinds at sunrise? (a) a light sensor (b) a motion sensor (c) a rain sensor (d) a soil moisture sensor
33. 33.⚙️ Which actuator would you use to beep an alarm? (a) a motor (b) a servo motor (c) a display (d) a buzzer
34. 34.Which job needs a sound sensor? (a) switch on with a clap (b) start a fan when hot (c) open blinds at sunrise (d) switch on lamps at dusk
35. 35.Which job needs a display? (a) beep an alarm (b) move water to plants (c) show the temperature (d) show a status light
36. 36.Which job needs a distance sensor? (a) open blinds at sunrise (b) start a fan when hot (c) make a parking alarm (d) close a window in rain
37. 37.Which job needs a buzzer? (a) open a gate to 90° (b) spin a robot’s wheels (c) turn to an exact angle (d) beep an alarm
38. 38.🔍 Which sensor would you use to warn of a gas leak? (a) a rain sensor (b) a light sensor (c) a temperature sensor (d) a gas sensor
39. 39.🔍 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)?
40. 40.🔍 Which sensor would you use to measure classroom noise? (a) a sound sensor (b) a distance sensor (c) a soil moisture sensor (d) a motion sensor

Free electronics lessons, practice and worksheets at talentjr.in/electronics-for-kids