Electronics Worksheet: Sensors and Actuators

Electronics lesson 26: Sensors and actuators · Set 256 · 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 light sensor? (a) switch on with a clap (b) open blinds at sunrise (c) keep an incubator warm (d) measure classroom noise
2. 2.Which job needs a temperature sensor? (a) make a parking alarm (b) measure classroom noise (c) spot someone walking in (d) start a fan when hot
3. 3.⚙️ Which actuator would you use to open a gate to 90°? (a) a display (b) a servo motor (c) a buzzer (d) a motor
4. 4.⚙️ Which actuator would you use to spin a robot’s wheels? (a) a servo motor (b) a motor (c) a buzzer (d) a pump
5. 5.⚙️ Which actuator would you use to move water to plants? (a) a servo motor (b) a motor (c) a pump (d) an LED
6. 6.⚙️ Which actuator would you use to beep an alarm? (a) a pump (b) a buzzer (c) a motor (d) a servo motor
7. 7.Which job needs a soil moisture sensor? (a) open blinds at sunrise (b) water a dry plant (c) start a fan when hot (d) warn of a gas leak
8. 8.🔍 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?
9. 9.Which job needs a pump? (a) open a gate to 90° (b) move water to plants (c) show the temperature (d) beep an alarm
10. 10.🔍 Which sensor would you use to make a parking alarm? (a) a rain sensor (b) a motion sensor (c) a distance sensor (d) a temperature sensor
11. 11.🔍 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)?
12. 12.True or false: to spot someone walking in, use a motion sensor. (a) False (b) True
13. 13.🔍 Which sensor would you use to stop a robot near walls? (a) a distance sensor (b) a gas sensor (c) a temperature sensor (d) a rain sensor
14. 14.Which job needs a display? (a) turn to an exact angle (b) show a status light (c) move water to plants (d) show the temperature
15. 15.Which job needs a motor? (a) show a status light (b) move water to plants (c) spin a robot’s wheels (d) show the temperature
16. 16.🔍 Which sensor would you use to switch on lamps at dusk? (a) a rain sensor (b) a motion sensor (c) a light sensor (d) a distance sensor
17. 17.Which job needs a buzzer? (a) show the temperature (b) open a gate to 90° (c) turn to an exact angle (d) beep an alarm
18. 18.Which job needs a servo motor? (a) spin a robot’s wheels (b) show a status light (c) beep an alarm (d) open a gate to 90°
19. 19.True or false: to open blinds at sunrise, use a motion sensor. (a) False (b) True
20. 20.True or false: to make a parking alarm, use a gas sensor. (a) True (b) False
21. 21.🔍 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)?
22. 22.🔍 Which sensor would you use to measure classroom noise? (a) a gas sensor (b) a light sensor (c) a sound sensor (d) a distance sensor
23. 23.🔍 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)?
24. 24.Which job needs a gas sensor? (a) start a fan when hot (b) switch on with a clap (c) warn of a gas leak (d) water a dry plant
25. 25.Which job needs a distance sensor? (a) warn of a gas leak (b) measure classroom noise (c) stop a robot near walls (d) switch on with a clap
26. 26.Which job needs a motion sensor? (a) water a dry plant (b) spot someone walking in (c) measure classroom noise (d) switch on lamps at dusk
27. 27.🔍 For a microcontroller, is a sensor an input or an output? (a) a fuse (b) a power source (c) an output (d) an input
28. 28.Which job needs a temperature sensor? (a) water a dry plant (b) keep an incubator warm (c) close a window in rain (d) warn of a gas leak
29. 29.True or false: to stop a robot near walls, use a light sensor. (a) True (b) False
30. 30.True or false: to switch on with a clap, use a motion sensor. (a) False (b) True
31. 31.⚙️ Which actuator would you use to turn to an exact angle? (a) a pump (b) a buzzer (c) a servo motor (d) a display
32. 32.True or false: to keep an incubator warm, use a temperature sensor. (a) True (b) False
33. 33.🔍 An object is 51 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
34. 34.True or false: to measure classroom noise, use a temperature sensor. (a) True (b) False
35. 35.⚙️ Which actuator would you use to show a status light? (a) a motor (b) a buzzer (c) a servo motor (d) an LED
36. 36.True or false: to water a dry plant, use a soil moisture sensor. (a) True (b) False
37. 37.Which job needs a rain sensor? (a) make a parking alarm (b) keep an incubator warm (c) switch on with a clap (d) close a window in rain
38. 38.🔍 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?
39. 39.True or false: to switch on lamps at dusk, use a distance sensor. (a) True (b) False
40. 40.True or false: to measure classroom noise, use a motion sensor. (a) True (b) False

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