Electronics Worksheet: Sensors and Actuators

Electronics lesson 26: Sensors and actuators · Set 327 · 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 show a status light? (a) a motor (b) a buzzer (c) a servo motor (d) an LED
2. 2.Which job needs a light sensor? (a) keep an incubator warm (b) make a parking alarm (c) start a fan when hot (d) open blinds at sunrise
3. 3.🔍 For a microcontroller, is a sensor an input or an output? (a) a fuse (b) an input (c) a power source (d) an output
4. 4.True or false: to close a window in rain, use a rain sensor. (a) False (b) True
5. 5.⚙️ Which actuator would you use to turn to an exact angle? (a) a servo motor (b) a display (c) a buzzer (d) a motor
6. 6.Which job needs a motor? (a) open a gate to 90° (b) turn to an exact angle (c) spin a robot’s wheels (d) show the temperature
7. 7.⚙️ What is an actuator? (a) an output that acts (b) a sensor (c) a battery (d) a program
8. 8.Which job needs a buzzer? (a) show a status light (b) beep an alarm (c) spin a robot’s wheels (d) turn to an exact angle
9. 9.Which job needs a sound sensor? (a) close a window in rain (b) stop a robot near walls (c) make a parking alarm (d) measure classroom noise
10. 10.True or false: to make a parking alarm, use a temperature sensor. (a) False (b) True
11. 11.Which job needs a temperature sensor? (a) switch on lamps at dusk (b) start a fan when hot (c) close a window in rain (d) stop a robot near walls
12. 12.Which job needs an LED? (a) spin a robot’s wheels (b) show a status light (c) move water to plants (d) turn to an exact angle
13. 13.Which job needs a soil moisture sensor? (a) start a fan when hot (b) water a dry plant (c) open blinds at sunrise (d) switch on lamps at dusk
14. 14.Which job needs a rain sensor? (a) close a window in rain (b) start a fan when hot (c) keep an incubator warm (d) switch on lamps at dusk
15. 15.🔍 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?
16. 16.🔍 Which sensor would you use to keep an incubator warm? (a) a soil moisture sensor (b) a rain sensor (c) a temperature sensor (d) a light sensor
17. 17.⚙️ Which actuator would you use to spin a robot’s wheels? (a) a servo motor (b) a motor (c) a display (d) an LED
18. 18.True or false: to start a fan when hot, use a temperature sensor. (a) True (b) False
19. 19.Which job needs a pump? (a) open a gate to 90° (b) spin a robot’s wheels (c) show a status light (d) move water to plants
20. 20.⚙️ Which actuator would you use to show the temperature? (a) an LED (b) a display (c) a motor (d) a buzzer
21. 21.True or false: to spot someone walking in, use a motion sensor. (a) False (b) True
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 sensor would you use to start a fan when hot? (a) a soil moisture sensor (b) a temperature sensor (c) a rain sensor (d) a gas sensor
24. 24.🔍 A distance sensor sends a sound pulse and hears the echo 2 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
25. 25.🔍 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?
26. 26.🔍 A distance sensor sends a sound pulse and hears the echo 20 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
27. 27.⚙️ Which actuator would you use to move water to plants? (a) a buzzer (b) a motor (c) a servo motor (d) a pump
28. 28.🔍 A distance sensor sends a sound pulse and hears the echo 18 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
29. 29.⚙️ Which actuator would you use to open a gate to 90°? (a) a servo motor (b) a buzzer (c) a pump (d) an LED
30. 30.🔍 Which sensor would you use to open blinds at sunrise? (a) a light sensor (b) a soil moisture sensor (c) a rain sensor (d) a sound sensor
31. 31.True or false: to start a fan when hot, use a gas sensor. (a) True (b) False
32. 32.Which job needs a motion sensor? (a) stop a robot near walls (b) keep an incubator warm (c) spot someone walking in (d) open blinds at sunrise
33. 33.Which job needs a sound sensor? (a) switch on with a clap (b) make a parking alarm (c) spot someone walking in (d) close a window in rain
34. 34.Which job needs a gas sensor? (a) spot someone walking in (b) open blinds at sunrise (c) keep an incubator warm (d) warn of a gas leak
35. 35.Which job needs a light sensor? (a) make a parking alarm (b) switch on with a clap (c) measure classroom noise (d) switch on lamps at dusk
36. 36.Which job needs a display? (a) move water to plants (b) show a status light (c) show the temperature (d) beep an alarm
37. 37.True or false: to stop a robot near walls, use a light sensor. (a) True (b) False
38. 38.True or false: to water a dry plant, use a soil moisture sensor. (a) False (b) True
39. 39.True or false: to start a fan when hot, use a light sensor. (a) False (b) True
40. 40.Which job needs a servo motor? (a) show the temperature (b) turn to an exact angle (c) move water to plants (d) beep an alarm

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