Electronics Worksheet: Sensors and Actuators

Electronics lesson 26: Sensors and actuators · Set 172 · 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) switch on lamps at dusk (b) spot someone walking in (c) switch on with a clap (d) close a window in rain
2. 2.Which job needs a light sensor? (a) make a parking alarm (b) switch on lamps at dusk (c) stop a robot near walls (d) keep an incubator warm
3. 3.Which job needs a sound sensor? (a) start a fan when hot (b) switch on lamps at dusk (c) water a dry plant (d) switch on with a clap
4. 4.Which job needs a gas sensor? (a) open blinds at sunrise (b) warn of a gas leak (c) start a fan when hot (d) spot someone walking in
5. 5.🔍 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)?
6. 6.⚙️ Which actuator would you use to beep an alarm? (a) a display (b) a buzzer (c) an LED (d) a motor
7. 7.True or false: to stop a robot near walls, use a distance sensor. (a) False (b) True
8. 8.🔍 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)?
9. 9.Which job needs a servo motor? (a) beep an alarm (b) spin a robot’s wheels (c) show a status light (d) turn to an exact angle
10. 10.🔍 For a microcontroller, is a sensor an input or an output? (a) a power source (b) a fuse (c) an input (d) an output
11. 11.Which job needs a distance sensor? (a) warn of a gas leak (b) open blinds at sunrise (c) close a window in rain (d) make a parking alarm
12. 12.🔍 Which sensor would you use to start a fan when hot? (a) a motion sensor (b) a light sensor (c) a temperature sensor (d) a rain sensor
13. 13.⚙️ What is an actuator? (a) an output that acts (b) a sensor (c) a program (d) a battery
14. 14.🔍 Which sensor would you use to open blinds at sunrise? (a) a soil moisture sensor (b) a rain sensor (c) a sound sensor (d) a light sensor
15. 15.⚙️ Which actuator would you use to spin a robot’s wheels? (a) an LED (b) a display (c) a motor (d) a buzzer
16. 16.True or false: to spot someone walking in, use a motion sensor. (a) False (b) True
17. 17.⚙️ Which actuator would you use to show a status light? (a) a pump (b) an LED (c) a display (d) a buzzer
18. 18.⚙️ Which actuator would you use to open a gate to 90°? (a) an LED (b) a motor (c) a buzzer (d) a servo motor
19. 19.🔍 Which sensor would you use to stop a robot near walls? (a) a distance sensor (b) a motion sensor (c) a temperature sensor (d) a soil moisture sensor
20. 20.Which job needs a soil moisture sensor? (a) keep an incubator warm (b) water a dry plant (c) start a fan when hot (d) switch on with a clap
21. 21.Which job needs a display? (a) move water to plants (b) spin a robot’s wheels (c) show the temperature (d) turn to an exact angle
22. 22.Which job needs a temperature sensor? (a) switch on lamps at dusk (b) switch on with a clap (c) make a parking alarm (d) keep an incubator warm
23. 23.🔍 An object is 136 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
24. 24.⚙️ Which actuator would you use to show the temperature? (a) a pump (b) a motor (c) an LED (d) a display
25. 25.True or false: to start a fan when hot, use a temperature sensor. (a) False (b) True
26. 26.Which job needs a pump? (a) show the temperature (b) move water to plants (c) beep an alarm (d) spin a robot’s wheels
27. 27.Which job needs an LED? (a) turn to an exact angle (b) spin a robot’s wheels (c) show a status light (d) show the temperature
28. 28.True or false: to keep an incubator warm, use a temperature sensor. (a) True (b) False
29. 29.🔍 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)?
30. 30.True or false: to warn of a gas leak, use a gas sensor. (a) True (b) False
31. 31.🔍 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)?
32. 32.🔍 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)?
33. 33.🔍 Which sensor would you use to spot someone walking in? (a) a motion sensor (b) a distance sensor (c) a gas sensor (d) a sound sensor
34. 34.Which job needs a rain sensor? (a) open blinds at sunrise (b) close a window in rain (c) make a parking alarm (d) spot someone walking in
35. 35.🔍 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)?
36. 36.Which job needs a servo motor? (a) spin a robot’s wheels (b) show the temperature (c) move water to plants (d) open a gate to 90°
37. 37.🔍 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)?
38. 38.True or false: to warn of a gas leak, use a temperature sensor. (a) False (b) True
39. 39.Which job needs a buzzer? (a) spin a robot’s wheels (b) show a status light (c) beep an alarm (d) move water to plants
40. 40.True or false: to close a window in rain, use a gas sensor. (a) True (b) False

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