Electronics Worksheet: Sensors and Actuators

Electronics lesson 26: Sensors and actuators · Set 133 · 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) turn to an exact angle (b) spin a robot’s wheels (c) move water to plants (d) show the temperature
2. 2.🔍 Which sensor would you use to water a dry plant? (a) a gas sensor (b) a distance sensor (c) a soil moisture sensor (d) a motion sensor
3. 3.🔍 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?
4. 4.🔍 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)?
5. 5.🔍 Which sensor would you use to make a parking alarm? (a) a sound sensor (b) a rain sensor (c) a distance sensor (d) a gas sensor
6. 6.⚙️ Which actuator would you use to show the temperature? (a) a servo motor (b) a buzzer (c) a display (d) an LED
7. 7.True or false: to switch on lamps at dusk, use a light sensor. (a) False (b) True
8. 8.⚙️ Which actuator would you use to turn to an exact angle? (a) an LED (b) a servo motor (c) a display (d) a motor
9. 9.Which job needs a sound sensor? (a) spot someone walking in (b) switch on lamps at dusk (c) measure classroom noise (d) stop a robot near walls
10. 10.Which job needs a sound sensor? (a) water a dry plant (b) spot someone walking in (c) switch on with a clap (d) stop a robot near walls
11. 11.⚙️ What is an actuator? (a) a battery (b) a sensor (c) a program (d) an output that acts
12. 12.True or false: to make a parking alarm, use a motion sensor. (a) False (b) True
13. 13.True or false: to start a fan when hot, use a sound sensor. (a) False (b) True
14. 14.Which job needs a motor? (a) move water to plants (b) open a gate to 90° (c) spin a robot’s wheels (d) turn to an exact angle
15. 15.🔍 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)?
16. 16.Which job needs a pump? (a) move water to plants (b) turn to an exact angle (c) open a gate to 90° (d) spin a robot’s wheels
17. 17.⚙️ Which actuator would you use to beep an alarm? (a) a buzzer (b) an LED (c) a display (d) a pump
18. 18.True or false: to start a fan when hot, use a light sensor. (a) True (b) False
19. 19.Which job needs a gas sensor? (a) water a dry plant (b) switch on lamps at dusk (c) warn of a gas leak (d) measure classroom noise
20. 20.⚙️ Which actuator would you use to spin a robot’s wheels? (a) a servo motor (b) a buzzer (c) a display (d) a motor
21. 21.🔍 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)?
22. 22.🔍 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)?
23. 23.True or false: to keep an incubator warm, use a temperature sensor. (a) True (b) False
24. 24.Which job needs an LED? (a) beep an alarm (b) open a gate to 90° (c) show a status light (d) spin a robot’s wheels
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.True or false: to spot someone walking in, use a motion sensor. (a) False (b) True
27. 27.True or false: to switch on lamps at dusk, use a soil moisture sensor. (a) True (b) False
28. 28.Which job needs a buzzer? (a) show the temperature (b) beep an alarm (c) spin a robot’s wheels (d) turn to an exact angle
29. 29.Which job needs a motion sensor? (a) switch on lamps at dusk (b) close a window in rain (c) spot someone walking in (d) start a fan when hot
30. 30.🔍 Which sensor would you use to open blinds at sunrise? (a) a rain sensor (b) a light sensor (c) a temperature sensor (d) a gas sensor
31. 31.True or false: to stop a robot near walls, use a distance sensor. (a) True (b) False
32. 32.True or false: to spot someone walking in, use a distance sensor. (a) True (b) False
33. 33.True or false: to switch on lamps at dusk, use a rain sensor. (a) True (b) False
34. 34.True or false: to keep an incubator warm, use a light sensor. (a) True (b) False
35. 35.🔍 Which sensor would you use to switch on with a clap? (a) a rain sensor (b) a sound sensor (c) a distance sensor (d) a light sensor
36. 36.True or false: to stop a robot near walls, use a rain sensor. (a) False (b) True
37. 37.🔍 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?
38. 38.True or false: to water a dry plant, use a gas sensor. (a) True (b) False
39. 39.🔍 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?
40. 40.🔍 Which sensor would you use to close a window in rain? (a) a motion sensor (b) a temperature sensor (c) a rain sensor (d) a light sensor

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