Electronics Worksheet: Sensors and Actuators

Electronics lesson 26: Sensors and actuators · Set 162 · 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 switch on lamps at dusk, use a motion sensor. (a) False (b) True
2. 2.⚙️ Which actuator would you use to show a status light? (a) an LED (b) a motor (c) a servo motor (d) a display
3. 3.⚙️ Which actuator would you use to turn to an exact angle? (a) a servo motor (b) a pump (c) a buzzer (d) an LED
4. 4.Which job needs a motor? (a) spin a robot’s wheels (b) turn to an exact angle (c) show the temperature (d) open a gate to 90°
5. 5.Which job needs a light sensor? (a) switch on lamps at dusk (b) stop a robot near walls (c) close a window in rain (d) keep an incubator warm
6. 6.⚙️ Which actuator would you use to spin a robot’s wheels? (a) an LED (b) a servo motor (c) a display (d) a motor
7. 7.🔍 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?
8. 8.🔍 Which sensor would you use to measure classroom noise? (a) a gas sensor (b) a soil moisture sensor (c) a sound sensor (d) a temperature sensor
9. 9.True or false: to open blinds at sunrise, use a light sensor. (a) True (b) False
10. 10.🔍 Which sensor would you use to close a window in rain? (a) a distance sensor (b) a rain sensor (c) a light sensor (d) a sound sensor
11. 11.🔍 For a microcontroller, is a sensor an input or an output? (a) a fuse (b) a power source (c) an output (d) an input
12. 12.Which job needs a buzzer? (a) open a gate to 90° (b) show the temperature (c) beep an alarm (d) move water to plants
13. 13.⚙️ Which actuator would you use to open a gate to 90°? (a) a buzzer (b) a pump (c) a servo motor (d) a motor
14. 14.Which job needs a rain sensor? (a) keep an incubator warm (b) close a window in rain (c) stop a robot near walls (d) switch on with a clap
15. 15.🔍 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)?
16. 16.🔍 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)?
17. 17.True or false: to water a dry plant, use a light sensor. (a) False (b) True
18. 18.⚙️ Which actuator would you use to beep an alarm? (a) a buzzer (b) a display (c) a servo motor (d) a pump
19. 19.🔍 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)?
20. 20.🔍 Which sensor would you use to open blinds at sunrise? (a) a sound sensor (b) a motion sensor (c) a light sensor (d) a distance sensor
21. 21.🔍 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)?
22. 22.🔍 Which sensor would you use to water a dry plant? (a) a rain sensor (b) a motion sensor (c) a distance sensor (d) a soil moisture sensor
23. 23.🔍 Which sensor would you use to warn of a gas leak? (a) a gas sensor (b) a light sensor (c) a sound sensor (d) a rain sensor
24. 24.Which job needs a soil moisture sensor? (a) water a dry plant (b) open blinds at sunrise (c) close a window in rain (d) spot someone walking in
25. 25.Which job needs a gas sensor? (a) warn of a gas leak (b) spot someone walking in (c) start a fan when hot (d) stop a robot near walls
26. 26.🔍 A distance sensor sends a sound pulse and hears the echo 1 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 show the temperature? (a) a motor (b) a display (c) a pump (d) a servo motor
28. 28.⚙️ What is an actuator? (a) an output that acts (b) a sensor (c) a program (d) a battery
29. 29.True or false: to open blinds at sunrise, use a soil moisture sensor. (a) True (b) False
30. 30.True or false: to switch on lamps at dusk, use a light sensor. (a) True (b) False
31. 31.🔍 Which sensor would you use to spot someone walking in? (a) a gas sensor (b) a rain sensor (c) a motion sensor (d) a soil moisture sensor
32. 32.True or false: to stop a robot near walls, use a distance sensor. (a) True (b) False
33. 33.🔍 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?
34. 34.True or false: to measure classroom noise, use a light sensor. (a) False (b) True
35. 35.Which job needs a pump? (a) beep an alarm (b) turn to an exact angle (c) open a gate to 90° (d) move water to plants
36. 36.True or false: to switch on with a clap, use a soil moisture sensor. (a) False (b) True
37. 37.🔍 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?
38. 38.True or false: to close a window in rain, use a light sensor. (a) True (b) False
39. 39.Which job needs a servo motor? (a) move water to plants (b) show the temperature (c) open a gate to 90° (d) show a status light
40. 40.True or false: to open blinds at sunrise, use a sound sensor. (a) True (b) False

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