Electronics Worksheet: Sensors and Actuators

Electronics lesson 26: Sensors and actuators · Set 108 · 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 sensor would you use to keep an incubator warm? (a) a temperature sensor (b) a motion sensor (c) a light sensor (d) a distance sensor
2. 2.🔍 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)?
3. 3.Which job needs a buzzer? (a) open a gate to 90° (b) show a status light (c) beep an alarm (d) show the temperature
4. 4.⚙️ Which actuator would you use to spin a robot’s wheels? (a) a motor (b) a buzzer (c) a pump (d) a servo motor
5. 5.🔍 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?
6. 6.True or false: to make a parking alarm, use a distance sensor. (a) True (b) False
7. 7.True or false: to switch on lamps at dusk, use a light sensor. (a) False (b) True
8. 8.Which job needs a sound sensor? (a) open blinds at sunrise (b) switch on with a clap (c) water a dry plant (d) warn of a gas leak
9. 9.Which job needs a motion sensor? (a) switch on lamps at dusk (b) switch on with a clap (c) spot someone walking in (d) open blinds at sunrise
10. 10.Which job needs a motor? (a) spin a robot’s wheels (b) beep an alarm (c) turn to an exact angle (d) show the temperature
11. 11.True or false: to measure classroom noise, use a light sensor. (a) True (b) False
12. 12.Which job needs a pump? (a) open a gate to 90° (b) beep an alarm (c) move water to plants (d) show a status light
13. 13.True or false: to warn of a gas leak, use a temperature sensor. (a) True (b) False
14. 14.Which job needs a servo motor? (a) show a status light (b) spin a robot’s wheels (c) show the temperature (d) turn to an exact angle
15. 15.Which job needs an LED? (a) beep an alarm (b) turn to an exact angle (c) show a status light (d) move water to plants
16. 16.True or false: to start a fan when hot, use a temperature sensor. (a) False (b) True
17. 17.🔍 Which sensor would you use to switch on lamps at dusk? (a) a temperature sensor (b) a motion sensor (c) a light sensor (d) a soil moisture sensor
18. 18.🔍 For a microcontroller, is a sensor an input or an output? (a) a power source (b) a fuse (c) an output (d) an input
19. 19.🔍 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?
20. 20.Which job needs a rain sensor? (a) water a dry plant (b) switch on with a clap (c) stop a robot near walls (d) close a window in rain
21. 21.Which job needs a soil moisture sensor? (a) water a dry plant (b) keep an incubator warm (c) switch on lamps at dusk (d) start a fan when hot
22. 22.True or false: to switch on with a clap, use a distance sensor. (a) False (b) True
23. 23.⚙️ What is an actuator? (a) a battery (b) a sensor (c) a program (d) an output that acts
24. 24.True or false: to warn of a gas leak, use a gas sensor. (a) False (b) True
25. 25.True or false: to water a dry plant, use a temperature sensor. (a) False (b) True
26. 26.🔍 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)?
27. 27.🔍 An object is 187 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
28. 28.🔍 Which sensor would you use to make a parking alarm? (a) a distance sensor (b) a light sensor (c) a rain sensor (d) a soil moisture sensor
29. 29.⚙️ Which actuator would you use to show the temperature? (a) an LED (b) a buzzer (c) a display (d) a pump
30. 30.🔍 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)?
31. 31.⚙️ Which actuator would you use to show a status light? (a) an LED (b) a buzzer (c) a pump (d) a servo motor
32. 32.Which job needs a light sensor? (a) water a dry plant (b) spot someone walking in (c) open blinds at sunrise (d) keep an incubator warm
33. 33.🔍 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?
34. 34.🔍 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?
35. 35.True or false: to open blinds at sunrise, use a light sensor. (a) True (b) False
36. 36.True or false: to warn of a gas leak, use a rain sensor. (a) True (b) False
37. 37.🔍 Which sensor would you use to spot someone walking in? (a) a motion sensor (b) a rain sensor (c) a soil moisture sensor (d) a temperature sensor
38. 38.🔍 An object is 221 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
39. 39.Which job needs a gas sensor? (a) measure classroom noise (b) keep an incubator warm (c) open blinds at sunrise (d) warn of a gas leak
40. 40.🔍 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)?

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