Electronics Worksheet: Sensors and Actuators

Electronics lesson 26: Sensors and actuators · Set 152 · 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.🔍 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)?
2. 2.⚙️ Which actuator would you use to show the temperature? (a) a buzzer (b) a display (c) a pump (d) a motor
3. 3.Which job needs a sound sensor? (a) open blinds at sunrise (b) spot someone walking in (c) measure classroom noise (d) switch on lamps at dusk
4. 4.Which job needs a gas sensor? (a) start a fan when hot (b) open blinds at sunrise (c) warn of a gas leak (d) make a parking alarm
5. 5.🔍 Which sensor would you use to measure classroom noise? (a) a soil moisture sensor (b) a distance sensor (c) a rain sensor (d) a sound sensor
6. 6.🔍 For a microcontroller, is a sensor an input or an output? (a) a power source (b) an input (c) an output (d) a fuse
7. 7.🔍 Which sensor would you use to spot someone walking in? (a) a distance sensor (b) a soil moisture sensor (c) a motion sensor (d) a light sensor
8. 8.🔍 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?
9. 9.Which job needs a servo motor? (a) turn to an exact angle (b) show a status light (c) move water to plants (d) show the temperature
10. 10.🔍 Which sensor would you use to warn of a gas leak? (a) a distance sensor (b) a soil moisture sensor (c) a gas sensor (d) a light sensor
11. 11.Which job needs a soil moisture sensor? (a) water a dry plant (b) keep an incubator warm (c) measure classroom noise (d) stop a robot near walls
12. 12.True or false: to switch on lamps at dusk, use a light sensor. (a) True (b) False
13. 13.Which job needs an LED? (a) show the temperature (b) show a status light (c) spin a robot’s wheels (d) move water to plants
14. 14.⚙️ Which actuator would you use to beep an alarm? (a) an LED (b) a motor (c) a display (d) a buzzer
15. 15.🔍 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?
16. 16.Which job needs a pump? (a) beep an alarm (b) spin a robot’s wheels (c) move water to plants (d) open a gate to 90°
17. 17.⚙️ Which actuator would you use to turn to an exact angle? (a) a buzzer (b) a servo motor (c) a motor (d) an LED
18. 18.🔍 A distance sensor sends a sound pulse and hears the echo 10 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
19. 19.Which job needs a distance sensor? (a) keep an incubator warm (b) warn of a gas leak (c) make a parking alarm (d) switch on lamps at dusk
20. 20.🔍 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?
21. 21.True or false: to close a window in rain, use a light sensor. (a) True (b) False
22. 22.🔍 Which sensor would you use to make a parking alarm? (a) a gas sensor (b) a distance sensor (c) a sound sensor (d) a temperature sensor
23. 23.⚙️ What is an actuator? (a) a sensor (b) a program (c) an output that acts (d) a battery
24. 24.⚙️ Which actuator would you use to show a status light? (a) a display (b) a pump (c) an LED (d) a servo motor
25. 25.True or false: to keep an incubator warm, use a soil moisture sensor. (a) False (b) True
26. 26.True or false: to switch on with a clap, use a sound sensor. (a) True (b) False
27. 27.⚙️ Which actuator would you use to move water to plants? (a) a pump (b) a servo motor (c) a motor (d) a buzzer
28. 28.🔍 Which sensor would you use to close a window in rain? (a) a sound sensor (b) a rain sensor (c) a temperature sensor (d) a light sensor
29. 29.True or false: to start a fan when hot, use a light sensor. (a) False (b) True
30. 30.True or false: to start a fan when hot, use a temperature sensor. (a) False (b) True
31. 31.🔍 Which sensor would you use to start a fan when hot? (a) a rain sensor (b) a sound sensor (c) a temperature sensor (d) a gas sensor
32. 32.True or false: to switch on with a clap, use a temperature sensor. (a) False (b) True
33. 33.Which job needs a servo motor? (a) spin a robot’s wheels (b) show a status light (c) open a gate to 90° (d) beep an alarm
34. 34.True or false: to measure classroom noise, use a sound sensor. (a) True (b) False
35. 35.Which job needs a motor? (a) turn to an exact angle (b) beep an alarm (c) spin a robot’s wheels (d) show a status light
36. 36.⚙️ Which actuator would you use to spin a robot’s wheels? (a) a pump (b) an LED (c) a servo motor (d) a motor
37. 37.🔍 Which sensor would you use to stop a robot near walls? (a) a soil moisture sensor (b) a sound sensor (c) a distance sensor (d) a rain sensor
38. 38.Which job needs a light sensor? (a) switch on lamps at dusk (b) keep an incubator warm (c) start a fan when hot (d) water a dry plant
39. 39.True or false: to water a dry plant, use a light sensor. (a) True (b) False
40. 40.🔍 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?

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