Electronics Worksheet: Sensors and Actuators

Electronics lesson 26: Sensors and actuators · Set 79 · 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 temperature sensor? (a) measure classroom noise (b) start a fan when hot (c) spot someone walking in (d) make a parking alarm
2. 2.🔍 An object is 68 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
3. 3.Which job needs a distance sensor? (a) stop a robot near walls (b) open blinds at sunrise (c) close a window in rain (d) keep an incubator warm
4. 4.Which job needs a pump? (a) show a status light (b) beep an alarm (c) move water to plants (d) turn to an exact angle
5. 5.⚙️ Which actuator would you use to show the temperature? (a) a display (b) a pump (c) a buzzer (d) a motor
6. 6.🔍 For a microcontroller, is a sensor an input or an output? (a) an output (b) a fuse (c) a power source (d) an input
7. 7.🔍 Which sensor would you use to water a dry plant? (a) a motion sensor (b) a light sensor (c) a temperature sensor (d) a soil moisture sensor
8. 8.True or false: to measure classroom noise, use a sound sensor. (a) False (b) True
9. 9.True or false: to make a parking alarm, use a distance sensor. (a) False (b) True
10. 10.True or false: to measure classroom noise, use a motion sensor. (a) False (b) True
11. 11.⚙️ What is an actuator? (a) a battery (b) a sensor (c) an output that acts (d) a program
12. 12.True or false: to switch on lamps at dusk, use a light sensor. (a) False (b) True
13. 13.⚙️ Which actuator would you use to open a gate to 90°? (a) a servo motor (b) a motor (c) a buzzer (d) a display
14. 14.🔍 Which sensor would you use to warn of a gas leak? (a) a distance sensor (b) a gas sensor (c) a motion sensor (d) a temperature sensor
15. 15.🔍 Which sensor would you use to keep an incubator warm? (a) a gas sensor (b) a distance sensor (c) a temperature sensor (d) a light sensor
16. 16.Which job needs a buzzer? (a) move water to plants (b) open a gate to 90° (c) spin a robot’s wheels (d) beep an alarm
17. 17.⚙️ Which actuator would you use to beep an alarm? (a) an LED (b) a motor (c) a buzzer (d) a servo motor
18. 18.⚙️ Which actuator would you use to turn to an exact angle? (a) a pump (b) a servo motor (c) a motor (d) a display
19. 19.True or false: to water a dry plant, use a motion sensor. (a) True (b) False
20. 20.Which job needs a display? (a) beep an alarm (b) move water to plants (c) spin a robot’s wheels (d) show the temperature
21. 21.🔍 Which sensor would you use to open blinds at sunrise? (a) a temperature sensor (b) a motion sensor (c) a light sensor (d) a distance sensor
22. 22.🔍 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)?
23. 23.True or false: to warn of a gas leak, use a rain sensor. (a) False (b) True
24. 24.⚙️ Which actuator would you use to move water to plants? (a) a servo motor (b) a display (c) a motor (d) a pump
25. 25.True or false: to keep an incubator warm, use a temperature sensor. (a) True (b) False
26. 26.True or false: to switch on with a clap, use a sound sensor. (a) False (b) True
27. 27.Which job needs a motion sensor? (a) stop a robot near walls (b) switch on lamps at dusk (c) spot someone walking in (d) open blinds at sunrise
28. 28.🔍 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)?
29. 29.Which job needs a servo motor? (a) turn to an exact angle (b) show a status light (c) spin a robot’s wheels (d) move water to plants
30. 30.Which job needs a motor? (a) open a gate to 90° (b) spin a robot’s wheels (c) beep an alarm (d) show a status light
31. 31.Which job needs a sound sensor? (a) switch on lamps at dusk (b) start a fan when hot (c) make a parking alarm (d) switch on with a clap
32. 32.🔍 Which sensor would you use to switch on lamps at dusk? (a) a temperature sensor (b) a distance sensor (c) a light sensor (d) a sound sensor
33. 33.True or false: to close a window in rain, use a rain sensor. (a) False (b) True
34. 34.True or false: to spot someone walking in, use a motion sensor. (a) True (b) False
35. 35.Which job needs a rain sensor? (a) stop a robot near walls (b) close a window in rain (c) spot someone walking in (d) start a fan when hot
36. 36.🔍 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)?
37. 37.🔍 Which sensor would you use to start a fan when hot? (a) a temperature sensor (b) a light sensor (c) a motion sensor (d) a soil moisture sensor
38. 38.🔍 A distance sensor sends a sound pulse and hears the echo 2 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
39. 39.True or false: to start a fan when hot, use a temperature sensor. (a) True (b) False
40. 40.Which job needs a temperature sensor? (a) close a window in rain (b) measure classroom noise (c) spot someone walking in (d) keep an incubator warm

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