Electronics Worksheet: Sensors and Actuators

Electronics lesson 26: Sensors and actuators · Set 264 · 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 buzzer? (a) beep an alarm (b) show the temperature (c) open a gate to 90° (d) turn to an exact angle
2. 2.⚙️ What is an actuator? (a) a sensor (b) a program (c) an output that acts (d) a battery
3. 3.Which job needs a distance sensor? (a) measure classroom noise (b) water a dry plant (c) switch on with a clap (d) stop a robot near walls
4. 4.Which job needs a motor? (a) open a gate to 90° (b) spin a robot’s wheels (c) beep an alarm (d) turn to an exact angle
5. 5.True or false: to close a window in rain, use a rain sensor. (a) True (b) False
6. 6.🔍 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?
7. 7.True or false: to warn of a gas leak, use a gas sensor. (a) True (b) False
8. 8.🔍 Which sensor would you use to start a fan when hot? (a) a light sensor (b) a motion sensor (c) a rain sensor (d) a temperature sensor
9. 9.🔍 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)?
10. 10.⚙️ Which actuator would you use to show a status light? (a) a buzzer (b) a display (c) an LED (d) a servo motor
11. 11.Which job needs a display? (a) turn to an exact angle (b) show the temperature (c) move water to plants (d) open a gate to 90°
12. 12.🔍 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?
13. 13.🔍 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)?
14. 14.Which job needs a pump? (a) open a gate to 90° (b) spin a robot’s wheels (c) show the temperature (d) move water to plants
15. 15.🔍 Which sensor would you use to switch on lamps at dusk? (a) a sound sensor (b) a temperature sensor (c) a gas sensor (d) a light sensor
16. 16.🔍 For a microcontroller, is a sensor an input or an output? (a) a fuse (b) an input (c) a power source (d) an output
17. 17.Which job needs a temperature sensor? (a) warn of a gas leak (b) open blinds at sunrise (c) start a fan when hot (d) water a dry plant
18. 18.Which job needs a gas sensor? (a) measure classroom noise (b) stop a robot near walls (c) warn of a gas leak (d) switch on with a clap
19. 19.Which job needs a soil moisture sensor? (a) switch on lamps at dusk (b) spot someone walking in (c) open blinds at sunrise (d) water a dry plant
20. 20.🔍 A distance sensor sends a sound pulse and hears the echo 11 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
21. 21.🔍 Which sensor would you use to switch on with a clap? (a) a gas sensor (b) a sound sensor (c) a soil moisture sensor (d) a motion sensor
22. 22.🔍 Which sensor would you use to water a dry plant? (a) a distance sensor (b) a sound sensor (c) a rain sensor (d) a soil moisture sensor
23. 23.⚙️ Which actuator would you use to show the temperature? (a) a servo motor (b) a pump (c) a display (d) a motor
24. 24.Which job needs a light sensor? (a) keep an incubator warm (b) warn of a gas leak (c) switch on with a clap (d) switch on lamps at dusk
25. 25.True or false: to switch on lamps at dusk, use a motion sensor. (a) False (b) True
26. 26.Which job needs an LED? (a) turn to an exact angle (b) beep an alarm (c) show a status light (d) open a gate to 90°
27. 27.🔍 Which sensor would you use to open blinds at sunrise? (a) a soil moisture sensor (b) a sound sensor (c) a light sensor (d) a motion sensor
28. 28.🔍 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?
29. 29.True or false: to make a parking alarm, use a gas sensor. (a) False (b) True
30. 30.True or false: to water a dry plant, use a temperature sensor. (a) False (b) True
31. 31.🔍 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?
32. 32.🔍 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?
33. 33.🔍 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?
34. 34.🔍 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)?
35. 35.True or false: to switch on lamps at dusk, use a temperature sensor. (a) True (b) False
36. 36.Which job needs a rain sensor? (a) open blinds at sunrise (b) switch on lamps at dusk (c) measure classroom noise (d) close a window in rain
37. 37.⚙️ Which actuator would you use to turn to an exact angle? (a) a buzzer (b) a servo motor (c) a display (d) a motor
38. 38.True or false: to spot someone walking in, use a sound sensor. (a) True (b) False
39. 39.True or false: to start a fan when hot, use a temperature sensor. (a) False (b) True
40. 40.True or false: to measure classroom noise, use a rain sensor. (a) False (b) True

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