Electronics Worksheet: Sensors and Actuators

Electronics lesson 26: Sensors and actuators · Set 89 · 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.⚙️ What is an actuator? (a) a program (b) a battery (c) a sensor (d) an output that acts
2. 2.⚙️ Which actuator would you use to spin a robot’s wheels? (a) a servo motor (b) a motor (c) a buzzer (d) a pump
3. 3.🔍 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?
4. 4.True or false: to stop a robot near walls, use a distance sensor. (a) True (b) False
5. 5.⚙️ Which actuator would you use to turn to an exact angle? (a) a pump (b) a display (c) a servo motor (d) a motor
6. 6.🔍 For a microcontroller, is a sensor an input or an output? (a) a fuse (b) an output (c) a power source (d) an input
7. 7.Which job needs a distance sensor? (a) keep an incubator warm (b) switch on lamps at dusk (c) switch on with a clap (d) stop a robot near walls
8. 8.Which job needs a buzzer? (a) show the temperature (b) beep an alarm (c) spin a robot’s wheels (d) show a status light
9. 9.Which job needs a servo motor? (a) show the temperature (b) show a status light (c) beep an alarm (d) turn to an exact angle
10. 10.Which job needs a temperature sensor? (a) switch on with a clap (b) spot someone walking in (c) keep an incubator warm (d) stop a robot near walls
11. 11.🔍 A distance sensor sends a sound pulse and hears the echo 17 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
12. 12.True or false: to spot someone walking in, use a soil moisture sensor. (a) True (b) False
13. 13.🔍 Which sensor would you use to measure classroom noise? (a) a light sensor (b) a temperature sensor (c) a sound sensor (d) a distance sensor
14. 14.Which job needs an LED? (a) turn to an exact angle (b) open a gate to 90° (c) show a status light (d) move water to plants
15. 15.Which job needs a sound sensor? (a) close a window in rain (b) keep an incubator warm (c) stop a robot near walls (d) switch on with a clap
16. 16.Which job needs a sound sensor? (a) open blinds at sunrise (b) measure classroom noise (c) water a dry plant (d) switch on lamps at dusk
17. 17.🔍 Which sensor would you use to close a window in rain? (a) a light sensor (b) a rain sensor (c) a sound sensor (d) a gas sensor
18. 18.True or false: to water a dry plant, use a soil moisture sensor. (a) False (b) True
19. 19.Which job needs a motor? (a) open a gate to 90° (b) spin a robot’s wheels (c) turn to an exact angle (d) show a status light
20. 20.Which job needs a servo motor? (a) spin a robot’s wheels (b) show a status light (c) open a gate to 90° (d) beep an alarm
21. 21.Which job needs a temperature sensor? (a) spot someone walking in (b) warn of a gas leak (c) start a fan when hot (d) make a parking alarm
22. 22.🔍 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)?
23. 23.Which job needs a pump? (a) beep an alarm (b) move water to plants (c) show a status light (d) turn to an exact angle
24. 24.🔍 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?
25. 25.🔍 Which sensor would you use to open blinds at sunrise? (a) a sound sensor (b) a light sensor (c) a temperature sensor (d) a rain sensor
26. 26.🔍 Which sensor would you use to stop a robot near walls? (a) a light sensor (b) a temperature sensor (c) a distance sensor (d) a gas sensor
27. 27.🔍 Which sensor would you use to start a fan when hot? (a) a gas sensor (b) a soil moisture sensor (c) a distance sensor (d) a temperature sensor
28. 28.True or false: to stop a robot near walls, use a temperature sensor. (a) False (b) True
29. 29.🔍 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)?
30. 30.True or false: to measure classroom noise, use a sound sensor. (a) True (b) False
31. 31.Which job needs a display? (a) beep an alarm (b) open a gate to 90° (c) show the temperature (d) spin a robot’s wheels
32. 32.True or false: to warn of a gas leak, use a gas sensor. (a) False (b) True
33. 33.🔍 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)?
34. 34.⚙️ Which actuator would you use to open a gate to 90°? (a) a motor (b) a display (c) a pump (d) a servo motor
35. 35.Which job needs a gas sensor? (a) measure classroom noise (b) close a window in rain (c) warn of a gas leak (d) spot someone walking in
36. 36.🔍 Which sensor would you use to make a parking alarm? (a) a rain sensor (b) a temperature sensor (c) a distance sensor (d) a soil moisture sensor
37. 37.True or false: to open blinds at sunrise, use a soil moisture sensor. (a) False (b) True
38. 38.🔍 A distance sensor sends a sound pulse and hears the echo 8 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
39. 39.True or false: to make a parking alarm, use a distance sensor. (a) True (b) False
40. 40.True or false: to make a parking alarm, use a rain sensor. (a) False (b) True

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