Electronics Worksheet: Sensors and Actuators

Electronics lesson 26: Sensors and actuators · Set 140 · 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 actuator would you use to turn to an exact angle? (a) a buzzer (b) a display (c) a servo motor (d) a motor
2. 2.⚙️ Which actuator would you use to move water to plants? (a) a servo motor (b) a display (c) a pump (d) a motor
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.🔍 For a microcontroller, is a sensor an input or an output? (a) an input (b) a power source (c) an output (d) a fuse
5. 5.Which job needs a light sensor? (a) switch on lamps at dusk (b) spot someone walking in (c) stop a robot near walls (d) warn of a gas leak
6. 6.Which job needs a gas sensor? (a) measure classroom noise (b) warn of a gas leak (c) spot someone walking in (d) keep an incubator warm
7. 7.🔍 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?
8. 8.True or false: to stop a robot near walls, use a distance sensor. (a) False (b) True
9. 9.Which job needs an LED? (a) show a status light (b) move water to plants (c) turn to an exact angle (d) open a gate to 90°
10. 10.⚙️ What is an actuator? (a) a sensor (b) a program (c) an output that acts (d) a battery
11. 11.🔍 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?
12. 12.🔍 Which sensor would you use to measure classroom noise? (a) a gas sensor (b) a sound sensor (c) a light sensor (d) a temperature sensor
13. 13.Which job needs a soil moisture sensor? (a) warn of a gas leak (b) keep an incubator warm (c) make a parking alarm (d) water a dry plant
14. 14.Which job needs a light sensor? (a) warn of a gas leak (b) open blinds at sunrise (c) start a fan when hot (d) stop a robot near walls
15. 15.True or false: to measure classroom noise, use a light sensor. (a) True (b) False
16. 16.True or false: to water a dry plant, use a soil moisture sensor. (a) False (b) True
17. 17.⚙️ Which actuator would you use to show the temperature? (a) a motor (b) a buzzer (c) a pump (d) a display
18. 18.🔍 Which sensor would you use to open blinds at sunrise? (a) a light sensor (b) a soil moisture sensor (c) a sound sensor (d) a gas sensor
19. 19.⚙️ Which actuator would you use to spin a robot’s wheels? (a) a motor (b) a buzzer (c) a pump (d) an LED
20. 20.Which job needs a display? (a) spin a robot’s wheels (b) beep an alarm (c) turn to an exact angle (d) show the temperature
21. 21.🔍 Which sensor would you use to keep an incubator warm? (a) a distance sensor (b) a temperature sensor (c) a light sensor (d) a rain sensor
22. 22.True or false: to spot someone walking in, use a gas sensor. (a) False (b) True
23. 23.🔍 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)?
24. 24.True or false: to switch on lamps at dusk, use a sound sensor. (a) False (b) True
25. 25.🔍 Which sensor would you use to warn of a gas leak? (a) a gas sensor (b) a light sensor (c) a soil moisture sensor (d) a rain sensor
26. 26.🔍 An object is 34 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
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.True or false: to switch on with a clap, use a temperature sensor. (a) False (b) True
29. 29.🔍 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?
30. 30.True or false: to switch on lamps at dusk, use a rain sensor. (a) False (b) True
31. 31.🔍 Which sensor would you use to make a parking alarm? (a) a soil moisture sensor (b) a distance sensor (c) a temperature sensor (d) a light sensor
32. 32.🔍 Which sensor would you use to stop a robot near walls? (a) a temperature sensor (b) a distance sensor (c) a soil moisture sensor (d) a sound sensor
33. 33.True or false: to switch on with a clap, use a sound sensor. (a) True (b) False
34. 34.⚙️ Which actuator would you use to beep an alarm? (a) a servo motor (b) a display (c) a buzzer (d) an LED
35. 35.Which job needs a servo motor? (a) beep an alarm (b) spin a robot’s wheels (c) turn to an exact angle (d) show a status light
36. 36.Which job needs a pump? (a) move water to plants (b) show the temperature (c) turn to an exact angle (d) spin a robot’s wheels
37. 37.Which job needs a temperature sensor? (a) open blinds at sunrise (b) start a fan when hot (c) water a dry plant (d) make a parking alarm
38. 38.🔍 Which sensor would you use to close a window in rain? (a) a gas sensor (b) a rain sensor (c) a light sensor (d) a temperature sensor
39. 39.🔍 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)?
40. 40.🔍 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)?

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