Electronics Worksheet: Sensors and Actuators

Electronics lesson 26: Sensors and actuators · Set 234 · 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 spot someone walking in, use a light sensor. (a) False (b) True
2. 2.⚙️ Which actuator would you use to move water to plants? (a) a buzzer (b) a display (c) a motor (d) a pump
3. 3.🔍 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?
4. 4.🔍 An object is 272 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
5. 5.Which job needs a rain sensor? (a) warn of a gas leak (b) measure classroom noise (c) close a window in rain (d) switch on with a clap
6. 6.🔍 A distance sensor sends a sound pulse and hears the echo 7 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
7. 7.True or false: to close a window in rain, use a rain sensor. (a) False (b) True
8. 8.🔍 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)?
9. 9.🔍 Which sensor would you use to measure classroom noise? (a) a gas sensor (b) a distance sensor (c) a sound sensor (d) a motion sensor
10. 10.🔍 Which sensor would you use to warn of a gas leak? (a) a temperature sensor (b) a light sensor (c) a gas sensor (d) a sound sensor
11. 11.🔍 Which sensor would you use to start a fan when hot? (a) a rain sensor (b) a temperature sensor (c) a soil moisture sensor (d) a distance sensor
12. 12.⚙️ Which actuator would you use to turn to an exact angle? (a) a servo motor (b) a buzzer (c) an LED (d) a display
13. 13.🔍 Which sensor would you use to switch on lamps at dusk? (a) a rain sensor (b) a light sensor (c) a distance sensor (d) a motion sensor
14. 14.Which job needs a motor? (a) move water to plants (b) show the temperature (c) spin a robot’s wheels (d) beep an alarm
15. 15.Which job needs a motion sensor? (a) keep an incubator warm (b) switch on lamps at dusk (c) spot someone walking in (d) stop a robot near walls
16. 16.🔍 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)?
17. 17.🔍 Which sensor would you use to open blinds at sunrise? (a) a motion sensor (b) a rain sensor (c) a distance sensor (d) a light sensor
18. 18.🔍 An object is 340 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
19. 19.🔍 Which sensor would you use to close a window in rain? (a) a temperature sensor (b) a soil moisture sensor (c) a rain sensor (d) a distance sensor
20. 20.True or false: to stop a robot near walls, use a distance sensor. (a) True (b) False
21. 21.⚙️ What is an actuator? (a) an output that acts (b) a sensor (c) a program (d) a battery
22. 22.Which job needs a pump? (a) move water to plants (b) open a gate to 90° (c) turn to an exact angle (d) show the temperature
23. 23.Which job needs a soil moisture sensor? (a) make a parking alarm (b) warn of a gas leak (c) keep an incubator warm (d) water a dry plant
24. 24.🔍 An object is 17 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
25. 25.🔍 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)?
26. 26.Which job needs a gas sensor? (a) switch on lamps at dusk (b) close a window in rain (c) measure classroom noise (d) warn of a gas leak
27. 27.🔍 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?
28. 28.🔍 A distance sensor sends a sound pulse and hears the echo 13 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
29. 29.Which job needs a servo motor? (a) turn to an exact angle (b) show the temperature (c) beep an alarm (d) spin a robot’s wheels
30. 30.⚙️ Which actuator would you use to spin a robot’s wheels? (a) a servo motor (b) a buzzer (c) an LED (d) a motor
31. 31.🔍 Which sensor would you use to keep an incubator warm? (a) a rain sensor (b) a soil moisture sensor (c) a sound sensor (d) a temperature sensor
32. 32.🔍 Which sensor would you use to spot someone walking in? (a) a temperature sensor (b) a gas sensor (c) a motion sensor (d) a soil moisture sensor
33. 33.Which job needs a buzzer? (a) open a gate to 90° (b) beep an alarm (c) spin a robot’s wheels (d) show the temperature
34. 34.🔍 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)?
35. 35.🔍 Which sensor would you use to switch on with a clap? (a) a rain sensor (b) a temperature sensor (c) a gas sensor (d) a sound sensor
36. 36.Which job needs a temperature sensor? (a) measure classroom noise (b) switch on with a clap (c) keep an incubator warm (d) close a window in rain
37. 37.🔍 Which sensor would you use to water a dry plant? (a) a rain sensor (b) a soil moisture sensor (c) a motion sensor (d) a distance sensor
38. 38.🔍 For a microcontroller, is a sensor an input or an output? (a) an input (b) an output (c) a power source (d) a fuse
39. 39.⚙️ Which actuator would you use to show a status light? (a) a pump (b) a servo motor (c) an LED (d) a motor
40. 40.Which job needs a sound sensor? (a) stop a robot near walls (b) switch on with a clap (c) make a parking alarm (d) switch on lamps at dusk

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