Electronics Worksheet: Sensors and Actuators

Electronics lesson 26: Sensors and actuators · Set 86 · 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.True or false: to warn of a gas leak, use a gas sensor. (a) True (b) False
2. 2.Which job needs a buzzer? (a) show a status light (b) beep an alarm (c) move water to plants (d) spin a robot’s wheels
3. 3.True or false: to spot someone walking in, use a motion sensor. (a) False (b) True
4. 4.Which job needs a temperature sensor? (a) switch on lamps at dusk (b) make a parking alarm (c) keep an incubator warm (d) measure classroom noise
5. 5.🔍 Which sensor would you use to keep an incubator warm? (a) a temperature sensor (b) a light sensor (c) a sound sensor (d) a soil moisture sensor
6. 6.⚙️ What is an actuator? (a) a sensor (b) a battery (c) an output that acts (d) a program
7. 7.Which job needs a light sensor? (a) water a dry plant (b) open blinds at sunrise (c) warn of a gas leak (d) stop a robot near walls
8. 8.🔍 A distance sensor sends a sound pulse and hears the echo 15 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
9. 9.Which job needs a distance sensor? (a) open blinds at sunrise (b) keep an incubator warm (c) warn of a gas leak (d) stop a robot near walls
10. 10.Which job needs a display? (a) move water to plants (b) turn to an exact angle (c) show a status light (d) show the temperature
11. 11.True or false: to switch on lamps at dusk, use a sound sensor. (a) True (b) False
12. 12.⚙️ Which actuator would you use to beep an alarm? (a) a buzzer (b) a pump (c) a motor (d) an LED
13. 13.🔍 An object is 68 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
14. 14.🔍 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?
15. 15.⚙️ Which actuator would you use to move water to plants? (a) a display (b) a servo motor (c) a motor (d) a pump
16. 16.⚙️ Which actuator would you use to spin a robot’s wheels? (a) a servo motor (b) a motor (c) a display (d) a pump
17. 17.⚙️ Which actuator would you use to turn to an exact angle? (a) a servo motor (b) a buzzer (c) a motor (d) an LED
18. 18.Which job needs an LED? (a) spin a robot’s wheels (b) move water to plants (c) show a status light (d) beep an alarm
19. 19.⚙️ Which actuator would you use to show a status light? (a) a pump (b) an LED (c) a display (d) a motor
20. 20.True or false: to stop a robot near walls, use a distance sensor. (a) True (b) False
21. 21.🔍 Which sensor would you use to stop a robot near walls? (a) a motion sensor (b) a distance sensor (c) a gas sensor (d) a sound sensor
22. 22.Which job needs a temperature sensor? (a) measure classroom noise (b) switch on lamps at dusk (c) stop a robot near walls (d) start a fan when hot
23. 23.True or false: to warn of a gas leak, use a motion sensor. (a) True (b) False
24. 24.🔍 An object is 204 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
25. 25.True or false: to switch on with a clap, use a gas sensor. (a) False (b) True
26. 26.🔍 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)?
27. 27.🔍 Which sensor would you use to start a fan when hot? (a) a sound sensor (b) a temperature sensor (c) a gas sensor (d) a light sensor
28. 28.🔍 Which sensor would you use to switch on lamps at dusk? (a) a light sensor (b) a temperature sensor (c) a motion sensor (d) a distance sensor
29. 29.True or false: to measure classroom noise, use a soil moisture sensor. (a) False (b) True
30. 30.True or false: to switch on lamps at dusk, use a light sensor. (a) True (b) False
31. 31.Which job needs a motion sensor? (a) warn of a gas leak (b) start a fan when hot (c) spot someone walking in (d) measure classroom noise
32. 32.🔍 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)?
33. 33.Which job needs a gas sensor? (a) open blinds at sunrise (b) stop a robot near walls (c) warn of a gas leak (d) start a fan when hot
34. 34.True or false: to keep an incubator warm, use a soil moisture sensor. (a) False (b) True
35. 35.Which job needs a sound sensor? (a) close a window in rain (b) switch on with a clap (c) keep an incubator warm (d) switch on lamps at dusk
36. 36.True or false: to close a window in rain, use a rain sensor. (a) True (b) False
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.🔍 Which sensor would you use to water a dry plant? (a) a soil moisture sensor (b) a distance sensor (c) a motion sensor (d) a temperature sensor
39. 39.Which job needs a motor? (a) turn to an exact angle (b) spin a robot’s wheels (c) move water to plants (d) show a status light
40. 40.⚙️ Which actuator would you use to open a gate to 90°? (a) a servo motor (b) a motor (c) a pump (d) a display

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