Electronics Worksheet: Sensors and Actuators

Electronics lesson 26: Sensors and actuators · Set 38 · 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 sensor would you use to start a fan when hot? (a) a temperature sensor (b) a motion sensor (c) a soil moisture sensor (d) a distance sensor
2. 2.🔍 A distance sensor sends a sound pulse and hears the echo 4 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
3. 3.⚙️ Which actuator would you use to show the temperature? (a) a display (b) an LED (c) a servo motor (d) a pump
4. 4.⚙️ What is an actuator? (a) a sensor (b) a program (c) an output that acts (d) a battery
5. 5.🔍 Which sensor would you use to switch on lamps at dusk? (a) a motion sensor (b) a soil moisture sensor (c) a gas sensor (d) a light sensor
6. 6.True or false: to close a window in rain, use a motion sensor. (a) False (b) True
7. 7.True or false: to start a fan when hot, use a distance sensor. (a) True (b) False
8. 8.⚙️ Which actuator would you use to open a gate to 90°? (a) a buzzer (b) an LED (c) a servo motor (d) a motor
9. 9.Which job needs a pump? (a) open a gate to 90° (b) turn to an exact angle (c) spin a robot’s wheels (d) move water to plants
10. 10.True or false: to spot someone walking in, use a temperature sensor. (a) True (b) False
11. 11.🔍 For a microcontroller, is a sensor an input or an output? (a) a fuse (b) a power source (c) an output (d) an input
12. 12.🔍 Which sensor would you use to water a dry plant? (a) a sound sensor (b) a rain sensor (c) a gas sensor (d) a soil moisture sensor
13. 13.True or false: to stop a robot near walls, use a light sensor. (a) True (b) False
14. 14.Which job needs a temperature sensor? (a) start a fan when hot (b) warn of a gas leak (c) switch on lamps at dusk (d) water a dry plant
15. 15.🔍 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)?
16. 16.Which job needs a motion sensor? (a) spot someone walking in (b) warn of a gas leak (c) switch on with a clap (d) open blinds at sunrise
17. 17.Which job needs a display? (a) show the temperature (b) spin a robot’s wheels (c) move water to plants (d) show a status light
18. 18.Which job needs a gas sensor? (a) start a fan when hot (b) make a parking alarm (c) open blinds at sunrise (d) warn of a gas leak
19. 19.⚙️ Which actuator would you use to spin a robot’s wheels? (a) an LED (b) a servo motor (c) a motor (d) a buzzer
20. 20.🔍 Which sensor would you use to make a parking alarm? (a) a rain sensor (b) a distance sensor (c) a soil moisture sensor (d) a light sensor
21. 21.Which job needs a distance sensor? (a) switch on lamps at dusk (b) open blinds at sunrise (c) keep an incubator warm (d) make a parking alarm
22. 22.Which job needs a motor? (a) open a gate to 90° (b) spin a robot’s wheels (c) beep an alarm (d) show the temperature
23. 23.Which job needs a soil moisture sensor? (a) stop a robot near walls (b) switch on lamps at dusk (c) open blinds at sunrise (d) water a dry plant
24. 24.🔍 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)?
25. 25.Which job needs a rain sensor? (a) keep an incubator warm (b) make a parking alarm (c) measure classroom noise (d) close a window in rain
26. 26.🔍 Which sensor would you use to switch on with a clap? (a) a light sensor (b) a gas sensor (c) a rain sensor (d) a sound sensor
27. 27.🔍 A distance sensor sends a sound pulse and hears the echo 12 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
28. 28.🔍 Which sensor would you use to measure classroom noise? (a) a gas sensor (b) a motion sensor (c) a sound sensor (d) a light sensor
29. 29.🔍 Which sensor would you use to close a window in rain? (a) a gas sensor (b) a light sensor (c) a rain sensor (d) a sound sensor
30. 30.Which job needs a temperature sensor? (a) measure classroom noise (b) keep an incubator warm (c) close a window in rain (d) switch on lamps at dusk
31. 31.True or false: to make a parking alarm, use a motion sensor. (a) True (b) False
32. 32.🔍 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)?
33. 33.True or false: to spot someone walking in, use a gas sensor. (a) True (b) False
34. 34.Which job needs an LED? (a) beep an alarm (b) show a status light (c) spin a robot’s wheels (d) move water to plants
35. 35.True or false: to close a window in rain, use a rain sensor. (a) False (b) True
36. 36.🔍 Which sensor would you use to warn of a gas leak? (a) a light sensor (b) a gas sensor (c) a soil moisture sensor (d) a motion sensor
37. 37.True or false: to start a fan when hot, use a temperature sensor. (a) False (b) True
38. 38.🔍 An object is 102 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
39. 39.True or false: to open blinds at sunrise, use a distance sensor. (a) True (b) False
40. 40.True or false: to warn of a gas leak, use a motion sensor. (a) True (b) False

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