Electronics Worksheet: Sensors and Actuators

Electronics lesson 26: Sensors and actuators · Set 119 · 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 spot someone walking in, use a gas sensor. (a) False (b) True
2. 2.Which job needs a light sensor? (a) keep an incubator warm (b) open blinds at sunrise (c) switch on with a clap (d) water a dry plant
3. 3.⚙️ What is an actuator? (a) a battery (b) a program (c) an output that acts (d) a sensor
4. 4.🔍 Which sensor would you use to close a window in rain? (a) a motion sensor (b) a distance sensor (c) a soil moisture sensor (d) a rain sensor
5. 5.Which job needs a buzzer? (a) spin a robot’s wheels (b) open a gate to 90° (c) beep an alarm (d) show the temperature
6. 6.True or false: to switch on lamps at dusk, use a motion sensor. (a) False (b) True
7. 7.🔍 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)?
8. 8.Which job needs a motor? (a) spin a robot’s wheels (b) open a gate to 90° (c) show a status light (d) turn to an exact angle
9. 9.Which job needs a display? (a) beep an alarm (b) spin a robot’s wheels (c) turn to an exact angle (d) show the temperature
10. 10.Which job needs a motion sensor? (a) warn of a gas leak (b) measure classroom noise (c) water a dry plant (d) spot someone walking in
11. 11.🔍 Which sensor would you use to open blinds at sunrise? (a) a light sensor (b) a rain sensor (c) a soil moisture sensor (d) a gas sensor
12. 12.⚙️ Which actuator would you use to turn to an exact angle? (a) a motor (b) a servo motor (c) an LED (d) a buzzer
13. 13.🔍 Which sensor would you use to make a parking alarm? (a) a gas sensor (b) a rain sensor (c) a distance sensor (d) a temperature sensor
14. 14.Which job needs a soil moisture sensor? (a) make a parking alarm (b) water a dry plant (c) warn of a gas leak (d) spot someone walking in
15. 15.Which job needs a gas sensor? (a) water a dry plant (b) close a window in rain (c) warn of a gas leak (d) spot someone walking in
16. 16.🔍 Which sensor would you use to switch on with a clap? (a) a distance sensor (b) a soil moisture sensor (c) a motion sensor (d) a sound sensor
17. 17.🔍 Which sensor would you use to start a fan when hot? (a) a distance sensor (b) a motion sensor (c) a light sensor (d) a temperature sensor
18. 18.True or false: to measure classroom noise, use a sound sensor. (a) False (b) True
19. 19.Which job needs a light sensor? (a) switch on lamps at dusk (b) spot someone walking in (c) water a dry plant (d) start a fan when hot
20. 20.⚙️ Which actuator would you use to show a status light? (a) an LED (b) a servo motor (c) a pump (d) a motor
21. 21.🔍 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?
22. 22.🔍 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)?
23. 23.🔍 Which sensor would you use to keep an incubator warm? (a) a distance sensor (b) a temperature sensor (c) a gas sensor (d) a motion sensor
24. 24.🔍 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?
25. 25.🔍 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?
26. 26.⚙️ Which actuator would you use to move water to plants? (a) a motor (b) a display (c) a pump (d) a buzzer
27. 27.🔍 For a microcontroller, is a sensor an input or an output? (a) an output (b) a fuse (c) a power source (d) an input
28. 28.Which job needs a servo motor? (a) show a status light (b) beep an alarm (c) show the temperature (d) turn to an exact angle
29. 29.🔍 An object is 255 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
30. 30.🔍 A distance sensor sends a sound pulse and hears the echo 13 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
31. 31.True or false: to spot someone walking in, use a motion sensor. (a) False (b) True
32. 32.🔍 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?
33. 33.⚙️ Which actuator would you use to spin a robot’s wheels? (a) a pump (b) a motor (c) an LED (d) a buzzer
34. 34.True or false: to switch on lamps at dusk, use a light sensor. (a) True (b) False
35. 35.🔍 Which sensor would you use to warn of a gas leak? (a) a distance sensor (b) a light sensor (c) a rain sensor (d) a gas sensor
36. 36.True or false: to switch on with a clap, use a sound sensor. (a) True (b) False
37. 37.Which job needs a temperature sensor? (a) close a window in rain (b) warn of a gas leak (c) switch on lamps at dusk (d) keep an incubator warm
38. 38.Which job needs a servo motor? (a) show a status light (b) open a gate to 90° (c) beep an alarm (d) move water to plants
39. 39.Which job needs a pump? (a) show the temperature (b) beep an alarm (c) open a gate to 90° (d) move water to plants
40. 40.⚙️ Which actuator would you use to show the temperature? (a) a pump (b) a display (c) a motor (d) an LED

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