Electronics Worksheet: Sensors and Actuators

Electronics lesson 26: Sensors and actuators · Set 167 · 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 servo motor? (a) show a status light (b) turn to an exact angle (c) move water to plants (d) spin a robot’s wheels
2. 2.True or false: to close a window in rain, use a distance sensor. (a) True (b) False
3. 3.🔍 For a microcontroller, is a sensor an input or an output? (a) a power source (b) a fuse (c) an input (d) an output
4. 4.True or false: to start a fan when hot, use a soil moisture sensor. (a) True (b) False
5. 5.🔍 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?
6. 6.🔍 A distance sensor sends a sound pulse and hears the echo 16 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
7. 7.Which job needs a display? (a) beep an alarm (b) move water to plants (c) show the temperature (d) show a status light
8. 8.⚙️ Which actuator would you use to show a status light? (a) a servo motor (b) a display (c) an LED (d) a motor
9. 9.🔍 Which sensor would you use to keep an incubator warm? (a) a temperature sensor (b) a distance sensor (c) a sound sensor (d) a light sensor
10. 10.Which job needs a buzzer? (a) turn to an exact angle (b) open a gate to 90° (c) spin a robot’s wheels (d) beep an alarm
11. 11.Which job needs a motor? (a) show the temperature (b) beep an alarm (c) open a gate to 90° (d) spin a robot’s wheels
12. 12.🔍 Which sensor would you use to switch on with a clap? (a) a distance sensor (b) a temperature sensor (c) a soil moisture sensor (d) a sound sensor
13. 13.True or false: to open blinds at sunrise, use a sound sensor. (a) True (b) False
14. 14.🔍 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?
15. 15.⚙️ What is an actuator? (a) an output that acts (b) a sensor (c) a program (d) a battery
16. 16.Which job needs a light sensor? (a) warn of a gas leak (b) switch on lamps at dusk (c) spot someone walking in (d) switch on with a clap
17. 17.🔍 Which sensor would you use to open blinds at sunrise? (a) a temperature sensor (b) a sound sensor (c) a light sensor (d) a distance sensor
18. 18.Which job needs a temperature sensor? (a) spot someone walking in (b) warn of a gas leak (c) switch on with a clap (d) keep an incubator warm
19. 19.True or false: to start a fan when hot, use a motion sensor. (a) True (b) False
20. 20.🔍 Which sensor would you use to measure classroom noise? (a) a gas sensor (b) a rain sensor (c) a motion sensor (d) a sound sensor
21. 21.⚙️ Which actuator would you use to move water to plants? (a) an LED (b) a servo motor (c) a motor (d) a pump
22. 22.🔍 A distance sensor sends a sound pulse and hears the echo 20 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
23. 23.Which job needs a distance sensor? (a) stop a robot near walls (b) switch on with a clap (c) start a fan when hot (d) spot someone walking in
24. 24.Which job needs an LED? (a) beep an alarm (b) show a status light (c) move water to plants (d) open a gate to 90°
25. 25.🔍 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)?
26. 26.🔍 Which sensor would you use to warn of a gas leak? (a) a light sensor (b) a distance sensor (c) a gas sensor (d) a sound sensor
27. 27.⚙️ Which actuator would you use to show the temperature? (a) a display (b) an LED (c) a pump (d) a motor
28. 28.🔍 Which sensor would you use to switch on lamps at dusk? (a) a light sensor (b) a gas sensor (c) a motion sensor (d) a sound sensor
29. 29.⚙️ Which actuator would you use to open a gate to 90°? (a) a display (b) a servo motor (c) a motor (d) a pump
30. 30.🔍 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?
31. 31.Which job needs a distance sensor? (a) make a parking alarm (b) switch on lamps at dusk (c) start a fan when hot (d) spot someone walking in
32. 32.⚙️ Which actuator would you use to beep an alarm? (a) an LED (b) a motor (c) a display (d) a buzzer
33. 33.Which job needs a light sensor? (a) make a parking alarm (b) measure classroom noise (c) spot someone walking in (d) open blinds at sunrise
34. 34.🔍 Which sensor would you use to stop a robot near walls? (a) a gas sensor (b) a distance sensor (c) a motion sensor (d) a rain sensor
35. 35.Which job needs a pump? (a) beep an alarm (b) move water to plants (c) show a status light (d) spin a robot’s wheels
36. 36.Which job needs a gas sensor? (a) close a window in rain (b) make a parking alarm (c) open blinds at sunrise (d) warn of a gas leak
37. 37.Which job needs a temperature sensor? (a) stop a robot near walls (b) start a fan when hot (c) spot someone walking in (d) open blinds at sunrise
38. 38.🔍 Which sensor would you use to spot someone walking in? (a) a temperature sensor (b) a gas sensor (c) a motion sensor (d) a sound sensor
39. 39.🔍 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?
40. 40.🔍 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)?

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