Electronics Worksheet: Sensors and Actuators

Electronics lesson 26: Sensors and actuators · Set 288 · 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 spin a robot’s wheels? (a) a motor (b) an LED (c) a buzzer (d) a servo motor
2. 2.🔍 Which sensor would you use to stop a robot near walls? (a) a gas sensor (b) a rain sensor (c) a light sensor (d) a distance sensor
3. 3.🔍 Which sensor would you use to make a parking alarm? (a) a soil moisture sensor (b) a motion sensor (c) a rain sensor (d) a distance sensor
4. 4.Which job needs a buzzer? (a) spin a robot’s wheels (b) move water to plants (c) show a status light (d) beep an alarm
5. 5.Which job needs a soil moisture sensor? (a) water a dry plant (b) make a parking alarm (c) switch on with a clap (d) open blinds at sunrise
6. 6.⚙️ Which actuator would you use to beep an alarm? (a) an LED (b) a motor (c) a pump (d) a buzzer
7. 7.🔍 For a microcontroller, is a sensor an input or an output? (a) an output (b) an input (c) a power source (d) a fuse
8. 8.⚙️ Which actuator would you use to show the temperature? (a) a pump (b) a display (c) a motor (d) a servo motor
9. 9.Which job needs a sound sensor? (a) open blinds at sunrise (b) measure classroom noise (c) switch on lamps at dusk (d) start a fan when hot
10. 10.🔍 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)?
11. 11.⚙️ What is an actuator? (a) an output that acts (b) a battery (c) a sensor (d) a program
12. 12.⚙️ Which actuator would you use to show a status light? (a) a pump (b) an LED (c) a servo motor (d) a buzzer
13. 13.⚙️ Which actuator would you use to move water to plants? (a) a motor (b) a display (c) a buzzer (d) a pump
14. 14.Which job needs a motion sensor? (a) water a dry plant (b) open blinds at sunrise (c) switch on lamps at dusk (d) spot someone walking in
15. 15.🔍 A distance sensor sends a sound pulse and hears the echo 12 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
16. 16.🔍 Which sensor would you use to switch on with a clap? (a) a soil moisture sensor (b) a sound sensor (c) a rain sensor (d) a gas sensor
17. 17.True or false: to stop a robot near walls, use a sound sensor. (a) True (b) False
18. 18.Which job needs an LED? (a) move water to plants (b) spin a robot’s wheels (c) show a status light (d) open a gate to 90°
19. 19.🔍 Which sensor would you use to keep an incubator warm? (a) a sound sensor (b) a rain sensor (c) a soil moisture sensor (d) a temperature sensor
20. 20.⚙️ Which actuator would you use to turn to an exact angle? (a) a servo motor (b) an LED (c) a pump (d) a motor
21. 21.True or false: to keep an incubator warm, use a sound sensor. (a) True (b) False
22. 22.⚙️ Which actuator would you use to open a gate to 90°? (a) a pump (b) a servo motor (c) an LED (d) a buzzer
23. 23.Which job needs a light sensor? (a) water a dry plant (b) start a fan when hot (c) switch on lamps at dusk (d) spot someone walking in
24. 24.🔍 A distance sensor sends a sound pulse and hears the echo 19 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
25. 25.Which job needs a motor? (a) open a gate to 90° (b) spin a robot’s wheels (c) beep an alarm (d) show the temperature
26. 26.Which job needs a pump? (a) turn to an exact angle (b) beep an alarm (c) move water to plants (d) spin a robot’s wheels
27. 27.🔍 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)?
28. 28.True or false: to open blinds at sunrise, use a distance sensor. (a) True (b) False
29. 29.Which job needs a servo motor? (a) show a status light (b) open a gate to 90° (c) spin a robot’s wheels (d) move water to plants
30. 30.🔍 Which sensor would you use to measure classroom noise? (a) a light sensor (b) a gas sensor (c) a distance sensor (d) a sound sensor
31. 31.Which job needs a temperature sensor? (a) warn of a gas leak (b) open blinds at sunrise (c) start a fan when hot (d) make a parking alarm
32. 32.True or false: to switch on with a clap, use a distance sensor. (a) True (b) False
33. 33.🔍 Which sensor would you use to close a window in rain? (a) a distance sensor (b) a motion sensor (c) a rain sensor (d) a light sensor
34. 34.True or false: to start a fan when hot, use a temperature sensor. (a) False (b) True
35. 35.🔍 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)?
36. 36.Which job needs a temperature sensor? (a) spot someone walking in (b) keep an incubator warm (c) water a dry plant (d) open blinds at sunrise
37. 37.🔍 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?
38. 38.🔍 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)?
39. 39.🔍 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?
40. 40.🔍 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?

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