Electronics Worksheet: Sensors and Actuators

Electronics lesson 26: Sensors and actuators · Set 160 · 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) turn to an exact angle (b) spin a robot’s wheels (c) beep an alarm (d) open a gate to 90°
2. 2.🔍 Which sensor would you use to keep an incubator warm? (a) a rain sensor (b) a soil moisture sensor (c) a temperature sensor (d) a light sensor
3. 3.🔍 For a microcontroller, is a sensor an input or an output? (a) an output (b) an input (c) a fuse (d) a power source
4. 4.⚙️ What is an actuator? (a) a battery (b) an output that acts (c) a program (d) a sensor
5. 5.🔍 Which sensor would you use to water a dry plant? (a) a light sensor (b) a soil moisture sensor (c) a gas sensor (d) a temperature sensor
6. 6.⚙️ Which actuator would you use to move water to plants? (a) a pump (b) a display (c) a buzzer (d) a motor
7. 7.True or false: to start a fan when hot, use a temperature sensor. (a) False (b) True
8. 8.Which job needs a light sensor? (a) switch on with a clap (b) spot someone walking in (c) make a parking alarm (d) switch on lamps at dusk
9. 9.🔍 Which sensor would you use to start a fan when hot? (a) a gas sensor (b) a light sensor (c) a temperature sensor (d) a sound sensor
10. 10.Which job needs a display? (a) spin a robot’s wheels (b) move water to plants (c) show a status light (d) show the temperature
11. 11.⚙️ Which actuator would you use to turn to an exact angle? (a) a buzzer (b) an LED (c) a servo motor (d) a pump
12. 12.⚙️ Which actuator would you use to beep an alarm? (a) a buzzer (b) a motor (c) an LED (d) a pump
13. 13.🔍 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)?
14. 14.🔍 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)?
15. 15.True or false: to spot someone walking in, use a motion sensor. (a) True (b) False
16. 16.Which job needs a distance sensor? (a) start a fan when hot (b) stop a robot near walls (c) close a window in rain (d) measure classroom noise
17. 17.🔍 Which sensor would you use to make a parking alarm? (a) a temperature sensor (b) a motion sensor (c) a distance sensor (d) a light sensor
18. 18.True or false: to close a window in rain, use a distance sensor. (a) False (b) True
19. 19.🔍 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)?
20. 20.🔍 An object is 34 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
21. 21.Which job needs a sound sensor? (a) switch on with a clap (b) water a dry plant (c) warn of a gas leak (d) switch on lamps at dusk
22. 22.🔍 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?
23. 23.⚙️ Which actuator would you use to spin a robot’s wheels? (a) a display (b) a motor (c) an LED (d) a buzzer
24. 24.Which job needs an LED? (a) beep an alarm (b) spin a robot’s wheels (c) show a status light (d) move water to plants
25. 25.🔍 An object is 187 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
26. 26.🔍 An object is 119 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
27. 27.🔍 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?
28. 28.True or false: to stop a robot near walls, use a light sensor. (a) False (b) True
29. 29.True or false: to open blinds at sunrise, use a gas sensor. (a) True (b) False
30. 30.Which job needs a gas sensor? (a) start a fan when hot (b) warn of a gas leak (c) close a window in rain (d) measure classroom noise
31. 31.Which job needs a buzzer? (a) show the temperature (b) beep an alarm (c) turn to an exact angle (d) spin a robot’s wheels
32. 32.Which job needs a pump? (a) spin a robot’s wheels (b) beep an alarm (c) show a status light (d) move water to plants
33. 33.🔍 Which sensor would you use to stop a robot near walls? (a) a distance sensor (b) a sound sensor (c) a light sensor (d) a temperature sensor
34. 34.Which job needs a temperature sensor? (a) measure classroom noise (b) start a fan when hot (c) switch on lamps at dusk (d) close a window in rain
35. 35.🔍 An object is 85 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
36. 36.⚙️ Which actuator would you use to open a gate to 90°? (a) a servo motor (b) a buzzer (c) a pump (d) a motor
37. 37.True or false: to make a parking alarm, use a distance sensor. (a) False (b) True
38. 38.🔍 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?
39. 39.Which job needs a light sensor? (a) spot someone walking in (b) stop a robot near walls (c) open blinds at sunrise (d) measure classroom noise
40. 40.🔍 An object is 170 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