Electronics Worksheet: Sensors and Actuators

Electronics lesson 26: Sensors and actuators · Set 149 · 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 measure classroom noise, use a distance sensor. (a) True (b) False
2. 2.⚙️ Which actuator would you use to show a status light? (a) a pump (b) an LED (c) a display (d) a buzzer
3. 3.Which job needs an LED? (a) turn to an exact angle (b) move water to plants (c) open a gate to 90° (d) show a status light
4. 4.🔍 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)?
5. 5.🔍 An object is 289 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
6. 6.Which job needs a temperature sensor? (a) spot someone walking in (b) keep an incubator warm (c) close a window in rain (d) make a parking alarm
7. 7.True or false: to warn of a gas leak, use a gas sensor. (a) False (b) True
8. 8.🔍 For a microcontroller, is a sensor an input or an output? (a) a power source (b) a fuse (c) an output (d) an input
9. 9.Which job needs a display? (a) spin a robot’s wheels (b) show the temperature (c) show a status light (d) turn to an exact angle
10. 10.🔍 Which sensor would you use to spot someone walking in? (a) a rain sensor (b) a temperature sensor (c) a soil moisture sensor (d) a motion sensor
11. 11.True or false: to keep an incubator warm, use a temperature sensor. (a) True (b) False
12. 12.🔍 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?
13. 13.Which job needs a motion sensor? (a) make a parking alarm (b) switch on with a clap (c) start a fan when hot (d) spot someone walking in
14. 14.🔍 Which sensor would you use to stop a robot near walls? (a) a distance sensor (b) a temperature sensor (c) a soil moisture sensor (d) a motion sensor
15. 15.⚙️ Which actuator would you use to beep an alarm? (a) a buzzer (b) a servo motor (c) a display (d) a motor
16. 16.🔍 A distance sensor sends a sound pulse and hears the echo 8 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
17. 17.Which job needs a soil moisture sensor? (a) keep an incubator warm (b) measure classroom noise (c) spot someone walking in (d) water a dry plant
18. 18.True or false: to water a dry plant, use a soil moisture sensor. (a) False (b) True
19. 19.🔍 An object is 102 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
20. 20.🔍 A distance sensor sends a sound pulse and hears the echo 3 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
21. 21.True or false: to close a window in rain, use a gas sensor. (a) True (b) False
22. 22.Which job needs a buzzer? (a) move water to plants (b) beep an alarm (c) show a status light (d) spin a robot’s wheels
23. 23.🔍 Which sensor would you use to switch on with a clap? (a) a soil moisture sensor (b) a light sensor (c) a sound sensor (d) a motion sensor
24. 24.Which job needs a light sensor? (a) spot someone walking in (b) keep an incubator warm (c) open blinds at sunrise (d) stop a robot near walls
25. 25.🔍 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?
26. 26.🔍 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)?
27. 27.⚙️ Which actuator would you use to turn to an exact angle? (a) a motor (b) a buzzer (c) a servo motor (d) a pump
28. 28.Which job needs a rain sensor? (a) open blinds at sunrise (b) start a fan when hot (c) switch on lamps at dusk (d) close a window in rain
29. 29.True or false: to spot someone walking in, use a soil moisture sensor. (a) False (b) True
30. 30.Which job needs a gas sensor? (a) warn of a gas leak (b) close a window in rain (c) start a fan when hot (d) switch on lamps at dusk
31. 31.Which job needs a sound sensor? (a) switch on lamps at dusk (b) stop a robot near walls (c) make a parking alarm (d) measure classroom noise
32. 32.🔍 Which sensor would you use to close a window in rain? (a) a light sensor (b) a rain sensor (c) a sound sensor (d) a motion sensor
33. 33.🔍 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?
34. 34.⚙️ What is an actuator? (a) a program (b) a battery (c) an output that acts (d) a sensor
35. 35.⚙️ Which actuator would you use to open a gate to 90°? (a) a pump (b) a motor (c) a servo motor (d) a display
36. 36.🔍 A distance sensor sends a sound pulse and hears the echo 18 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
37. 37.True or false: to measure classroom noise, use a temperature sensor. (a) False (b) True
38. 38.⚙️ Which actuator would you use to spin a robot’s wheels? (a) a pump (b) a motor (c) a display (d) a servo motor
39. 39.Which job needs a servo motor? (a) open a gate to 90° (b) move water to plants (c) show the temperature (d) spin a robot’s wheels
40. 40.True or false: to switch on lamps at dusk, use a rain sensor. (a) True (b) False

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