Electronics Worksheet: Sensors and Actuators

Electronics lesson 26: Sensors and actuators · Set 84 · 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 motion sensor. (a) False (b) True
2. 2.⚙️ Which actuator would you use to spin a robot’s wheels? (a) a servo motor (b) an LED (c) a motor (d) a display
3. 3.True or false: to switch on with a clap, use a temperature sensor. (a) False (b) True
4. 4.Which job needs a motor? (a) spin a robot’s wheels (b) move water to plants (c) open a gate to 90° (d) beep an alarm
5. 5.Which job needs a pump? (a) beep an alarm (b) open a gate to 90° (c) show a status light (d) move water to plants
6. 6.🔍 A distance sensor sends a sound pulse and hears the echo 3 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
7. 7.⚙️ Which actuator would you use to move water to plants? (a) a motor (b) a buzzer (c) a servo motor (d) a pump
8. 8.Which job needs a gas sensor? (a) measure classroom noise (b) spot someone walking in (c) warn of a gas leak (d) start a fan when hot
9. 9.True or false: to open blinds at sunrise, use a motion sensor. (a) False (b) True
10. 10.🔍 An object is 85 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
11. 11.Which job needs a motion sensor? (a) switch on with a clap (b) stop a robot near walls (c) close a window in rain (d) spot someone walking in
12. 12.🔍 Which sensor would you use to make a parking alarm? (a) a motion sensor (b) a light sensor (c) a gas sensor (d) a distance sensor
13. 13.Which job needs a soil moisture sensor? (a) open blinds at sunrise (b) switch on with a clap (c) make a parking alarm (d) water a dry plant
14. 14.Which job needs a light sensor? (a) keep an incubator warm (b) make a parking alarm (c) water a dry plant (d) switch on lamps at dusk
15. 15.⚙️ Which actuator would you use to show the temperature? (a) a buzzer (b) a pump (c) a display (d) a servo motor
16. 16.🔍 For a microcontroller, is a sensor an input or an output? (a) an input (b) a fuse (c) an output (d) a power source
17. 17.True or false: to switch on with a clap, use a sound sensor. (a) True (b) False
18. 18.Which job needs an LED? (a) beep an alarm (b) spin a robot’s wheels (c) show a status light (d) show the temperature
19. 19.🔍 Which sensor would you use to keep an incubator warm? (a) a soil moisture sensor (b) a motion sensor (c) a temperature sensor (d) a light sensor
20. 20.🔍 Which sensor would you use to stop a robot near walls? (a) a motion sensor (b) a rain sensor (c) a distance sensor (d) a sound sensor
21. 21.True or false: to switch on lamps at dusk, use a light sensor. (a) True (b) False
22. 22.True or false: to open blinds at sunrise, use a rain sensor. (a) False (b) True
23. 23.⚙️ What is an actuator? (a) a battery (b) a program (c) an output that acts (d) a sensor
24. 24.🔍 An object is 51 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
25. 25.🔍 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)?
26. 26.True or false: to water a dry plant, use a sound sensor. (a) False (b) True
27. 27.Which job needs a buzzer? (a) open a gate to 90° (b) show the temperature (c) spin a robot’s wheels (d) beep an alarm
28. 28.⚙️ Which actuator would you use to show a status light? (a) an LED (b) a motor (c) a servo motor (d) a display
29. 29.Which job needs a sound sensor? (a) stop a robot near walls (b) switch on with a clap (c) close a window in rain (d) keep an incubator warm
30. 30.True or false: to stop a robot near walls, use a gas sensor. (a) False (b) True
31. 31.Which job needs a light sensor? (a) measure classroom noise (b) stop a robot near walls (c) start a fan when hot (d) open blinds at sunrise
32. 32.🔍 Which sensor would you use to warn of a gas leak? (a) a distance sensor (b) a soil moisture sensor (c) a gas sensor (d) a light sensor
33. 33.⚙️ Which actuator would you use to turn to an exact angle? (a) an LED (b) a buzzer (c) a pump (d) a servo motor
34. 34.Which job needs a sound sensor? (a) stop a robot near walls (b) switch on lamps at dusk (c) make a parking alarm (d) measure classroom noise
35. 35.🔍 A distance sensor sends a sound pulse and hears the echo 14 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
36. 36.True or false: to start a fan when hot, use a motion sensor. (a) True (b) False
37. 37.True or false: to water a dry plant, use a soil moisture sensor. (a) False (b) True
38. 38.True or false: to keep an incubator warm, use a temperature sensor. (a) False (b) True
39. 39.True or false: to start a fan when hot, use a light sensor. (a) True (b) False
40. 40.True or false: to switch on lamps at dusk, use a sound sensor. (a) True (b) False

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