Electronics Worksheet: Sensors and Actuators

Electronics lesson 26: Sensors and actuators · Set 61 · 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 motion sensor? (a) spot someone walking in (b) switch on with a clap (c) measure classroom noise (d) make a parking alarm
2. 2.🔍 Which sensor would you use to measure classroom noise? (a) a rain sensor (b) a soil moisture sensor (c) a motion sensor (d) a sound sensor
3. 3.⚙️ Which actuator would you use to spin a robot’s wheels? (a) a motor (b) a pump (c) a buzzer (d) a servo motor
4. 4.🔍 Which sensor would you use to switch on with a clap? (a) a sound sensor (b) a gas sensor (c) a temperature sensor (d) a distance sensor
5. 5.Which job needs a temperature sensor? (a) make a parking alarm (b) start a fan when hot (c) switch on lamps at dusk (d) spot someone walking in
6. 6.⚙️ What is an actuator? (a) a program (b) an output that acts (c) a battery (d) a sensor
7. 7.Which job needs an LED? (a) show a status light (b) open a gate to 90° (c) turn to an exact angle (d) move water to plants
8. 8.True or false: to warn of a gas leak, use a rain sensor. (a) False (b) True
9. 9.⚙️ Which actuator would you use to turn to an exact angle? (a) a pump (b) a motor (c) a display (d) a servo motor
10. 10.True or false: to water a dry plant, use a temperature sensor. (a) True (b) False
11. 11.⚙️ Which actuator would you use to open a gate to 90°? (a) a pump (b) a servo motor (c) a motor (d) an LED
12. 12.⚙️ Which actuator would you use to beep an alarm? (a) an LED (b) a pump (c) a motor (d) a buzzer
13. 13.🔍 Which sensor would you use to warn of a gas leak? (a) a distance sensor (b) a temperature sensor (c) a light sensor (d) a gas sensor
14. 14.🔍 Which sensor would you use to switch on lamps at dusk? (a) a soil moisture sensor (b) a motion sensor (c) a light sensor (d) a sound sensor
15. 15.Which job needs a buzzer? (a) turn to an exact angle (b) spin a robot’s wheels (c) show the temperature (d) beep an alarm
16. 16.Which job needs a light sensor? (a) warn of a gas leak (b) stop a robot near walls (c) switch on with a clap (d) switch on lamps at dusk
17. 17.⚙️ Which actuator would you use to show the temperature? (a) an LED (b) a display (c) a motor (d) a pump
18. 18.True or false: to keep an incubator warm, use a light sensor. (a) False (b) True
19. 19.🔍 For a microcontroller, is a sensor an input or an output? (a) an input (b) an output (c) a power source (d) a fuse
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.Which job needs a display? (a) turn to an exact angle (b) show the temperature (c) show a status light (d) open a gate to 90°
22. 22.Which job needs a temperature sensor? (a) open blinds at sunrise (b) stop a robot near walls (c) keep an incubator warm (d) spot someone walking in
23. 23.🔍 Which sensor would you use to make a parking alarm? (a) a distance sensor (b) a temperature sensor (c) a motion sensor (d) a sound sensor
24. 24.Which job needs a soil moisture sensor? (a) spot someone walking in (b) start a fan when hot (c) water a dry plant (d) make a parking alarm
25. 25.🔍 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)?
26. 26.True or false: to keep an incubator warm, use a sound sensor. (a) False (b) True
27. 27.⚙️ Which actuator would you use to move water to plants? (a) a motor (b) a pump (c) a servo motor (d) a buzzer
28. 28.🔍 A distance sensor sends a sound pulse and hears the echo 9 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
29. 29.Which job needs a motor? (a) move water to plants (b) beep an alarm (c) spin a robot’s wheels (d) turn to an exact angle
30. 30.🔍 An object is 238 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
31. 31.🔍 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)?
32. 32.True or false: to make a parking alarm, use a distance sensor. (a) False (b) True
33. 33.Which job needs a pump? (a) move water to plants (b) spin a robot’s wheels (c) turn to an exact angle (d) show the temperature
34. 34.True or false: to spot someone walking in, use a temperature sensor. (a) False (b) True
35. 35.🔍 Which sensor would you use to close a window in rain? (a) a gas sensor (b) a motion sensor (c) a distance sensor (d) a rain sensor
36. 36.Which job needs a rain sensor? (a) close a window in rain (b) measure classroom noise (c) spot someone walking in (d) water a dry plant
37. 37.🔍 Which sensor would you use to water a dry plant? (a) a gas sensor (b) a light sensor (c) a soil moisture sensor (d) a distance sensor
38. 38.🔍 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?
39. 39.True or false: to switch on lamps at dusk, use a light sensor. (a) True (b) False
40. 40.🔍 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?

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