Electronics Worksheet: Sensors and Actuators

Electronics lesson 26: Sensors and actuators · Set 28 · 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.🔍 For a microcontroller, is a sensor an input or an output? (a) a fuse (b) an input (c) a power source (d) an output
2. 2.Which job needs a pump? (a) show a status light (b) spin a robot’s wheels (c) move water to plants (d) turn to an exact angle
3. 3.Which job needs a display? (a) spin a robot’s wheels (b) beep an alarm (c) open a gate to 90° (d) show the temperature
4. 4.Which job needs a motor? (a) move water to plants (b) turn to an exact angle (c) spin a robot’s wheels (d) show the temperature
5. 5.⚙️ Which actuator would you use to open a gate to 90°? (a) a pump (b) a display (c) a servo motor (d) a motor
6. 6.⚙️ What is an actuator? (a) a program (b) an output that acts (c) a sensor (d) a battery
7. 7.🔍 Which sensor would you use to measure classroom noise? (a) a soil moisture sensor (b) a light sensor (c) a distance sensor (d) a sound sensor
8. 8.Which job needs a soil moisture sensor? (a) switch on lamps at dusk (b) close a window in rain (c) keep an incubator warm (d) water a dry plant
9. 9.🔍 Which sensor would you use to make a parking alarm? (a) a distance sensor (b) a motion sensor (c) a gas sensor (d) a light sensor
10. 10.Which job needs a light sensor? (a) keep an incubator warm (b) make a parking alarm (c) water a dry plant (d) open blinds at sunrise
11. 11.True or false: to measure classroom noise, use a sound sensor. (a) False (b) True
12. 12.Which job needs a motion sensor? (a) open blinds at sunrise (b) start a fan when hot (c) warn of a gas leak (d) spot someone walking in
13. 13.🔍 Which sensor would you use to spot someone walking in? (a) a sound sensor (b) a gas sensor (c) a motion sensor (d) a distance sensor
14. 14.🔍 A distance sensor sends a sound pulse and hears the echo 1 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
15. 15.🔍 Which sensor would you use to close a window in rain? (a) a rain sensor (b) a distance sensor (c) a soil moisture sensor (d) a light sensor
16. 16.True or false: to switch on lamps at dusk, use a distance sensor. (a) True (b) False
17. 17.🔍 Which sensor would you use to open blinds at sunrise? (a) a light sensor (b) a distance sensor (c) a soil moisture sensor (d) a gas sensor
18. 18.Which job needs a gas sensor? (a) warn of a gas leak (b) spot someone walking in (c) make a parking alarm (d) switch on lamps at dusk
19. 19.Which job needs a temperature sensor? (a) switch on lamps at dusk (b) open blinds at sunrise (c) stop a robot near walls (d) start a fan when hot
20. 20.🔍 Which sensor would you use to switch on with a clap? (a) a soil moisture sensor (b) a light sensor (c) a temperature sensor (d) a sound sensor
21. 21.🔍 Which sensor would you use to keep an incubator warm? (a) a motion sensor (b) a soil moisture sensor (c) a temperature sensor (d) a sound sensor
22. 22.🔍 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?
23. 23.True or false: to start a fan when hot, use a temperature sensor. (a) True (b) False
24. 24.🔍 Which sensor would you use to start a fan when hot? (a) a temperature sensor (b) a rain sensor (c) a gas sensor (d) a distance sensor
25. 25.True or false: to stop a robot near walls, use a soil moisture sensor. (a) True (b) False
26. 26.True or false: to close a window in rain, use a sound sensor. (a) True (b) False
27. 27.Which job needs a sound sensor? (a) warn of a gas leak (b) open blinds at sunrise (c) switch on lamps at dusk (d) switch on with a clap
28. 28.Which job needs a temperature sensor? (a) make a parking alarm (b) close a window in rain (c) switch on lamps at dusk (d) keep an incubator warm
29. 29.True or false: to make a parking alarm, use a distance sensor. (a) True (b) False
30. 30.🔍 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?
31. 31.⚙️ Which actuator would you use to move water to plants? (a) a servo motor (b) a pump (c) a display (d) an LED
32. 32.Which job needs a buzzer? (a) turn to an exact angle (b) beep an alarm (c) move water to plants (d) show the temperature
33. 33.Which job needs a servo motor? (a) move water to plants (b) beep an alarm (c) show a status light (d) open a gate to 90°
34. 34.Which job needs an LED? (a) spin a robot’s wheels (b) move water to plants (c) beep an alarm (d) show a status light
35. 35.True or false: to switch on with a clap, use a temperature sensor. (a) True (b) False
36. 36.🔍 An object is 306 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
37. 37.True or false: to warn of a gas leak, use a distance sensor. (a) False (b) True
38. 38.True or false: to open blinds at sunrise, use a temperature sensor. (a) False (b) True
39. 39.Which job needs a distance sensor? (a) measure classroom noise (b) close a window in rain (c) warn of a gas leak (d) make a parking alarm
40. 40.Which job needs a distance sensor? (a) measure classroom noise (b) warn of a gas leak (c) close a window in rain (d) stop a robot near walls

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