Electronics Worksheet: Sensors and Actuators

Electronics lesson 26: Sensors and actuators · Set 214 · 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 sound sensor? (a) switch on with a clap (b) warn of a gas leak (c) switch on lamps at dusk (d) keep an incubator warm
2. 2.⚙️ Which actuator would you use to show the temperature? (a) a pump (b) a servo motor (c) a display (d) a motor
3. 3.Which job needs a gas sensor? (a) switch on with a clap (b) close a window in rain (c) warn of a gas leak (d) start a fan when hot
4. 4.Which job needs a motor? (a) turn to an exact angle (b) show a status light (c) show the temperature (d) spin a robot’s wheels
5. 5.Which job needs a display? (a) move water to plants (b) turn to an exact angle (c) show the temperature (d) spin a robot’s wheels
6. 6.🔍 Which sensor would you use to measure classroom noise? (a) a light sensor (b) a temperature sensor (c) a motion sensor (d) a sound sensor
7. 7.🔍 For a microcontroller, is a sensor an input or an output? (a) an input (b) an output (c) a fuse (d) a power source
8. 8.True or false: to close a window in rain, use a distance sensor. (a) False (b) True
9. 9.True or false: to close a window in rain, use a light sensor. (a) False (b) True
10. 10.Which job needs a temperature sensor? (a) keep an incubator warm (b) make a parking alarm (c) open blinds at sunrise (d) switch on with a clap
11. 11.⚙️ Which actuator would you use to spin a robot’s wheels? (a) a servo motor (b) a pump (c) a buzzer (d) a motor
12. 12.🔍 A distance sensor sends a sound pulse and hears the echo 16 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
13. 13.⚙️ What is an actuator? (a) a battery (b) a program (c) a sensor (d) an output that acts
14. 14.True or false: to keep an incubator warm, use a temperature sensor. (a) False (b) True
15. 15.🔍 Which sensor would you use to keep an incubator warm? (a) a temperature sensor (b) a gas sensor (c) a sound sensor (d) a light sensor
16. 16.True or false: to measure classroom noise, use a sound sensor. (a) False (b) True
17. 17.🔍 Which sensor would you use to stop a robot near walls? (a) a rain sensor (b) a soil moisture sensor (c) a sound sensor (d) a distance sensor
18. 18.🔍 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)?
19. 19.Which job needs a distance sensor? (a) warn of a gas leak (b) switch on with a clap (c) make a parking alarm (d) measure classroom noise
20. 20.⚙️ Which actuator would you use to show a status light? (a) a motor (b) a pump (c) an LED (d) a buzzer
21. 21.🔍 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)?
22. 22.Which job needs a buzzer? (a) move water to plants (b) show a status light (c) beep an alarm (d) turn to an exact angle
23. 23.🔍 Which sensor would you use to switch on with a clap? (a) a motion sensor (b) a light sensor (c) a rain sensor (d) a sound sensor
24. 24.Which job needs a light sensor? (a) spot someone walking in (b) water a dry plant (c) open blinds at sunrise (d) keep an incubator warm
25. 25.Which job needs a pump? (a) show the temperature (b) open a gate to 90° (c) show a status light (d) move water to plants
26. 26.True or false: to keep an incubator warm, use a rain sensor. (a) True (b) False
27. 27.🔍 Which sensor would you use to make a parking alarm? (a) a distance sensor (b) a soil moisture sensor (c) a gas sensor (d) a light sensor
28. 28.🔍 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)?
29. 29.Which job needs an LED? (a) show a status light (b) spin a robot’s wheels (c) move water to plants (d) show the temperature
30. 30.True or false: to switch on with a clap, use a rain sensor. (a) True (b) False
31. 31.⚙️ Which actuator would you use to move water to plants? (a) a motor (b) a display (c) an LED (d) a pump
32. 32.🔍 An object is 289 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
33. 33.True or false: to open blinds at sunrise, use a light sensor. (a) True (b) False
34. 34.🔍 Which sensor would you use to water a dry plant? (a) a gas sensor (b) a soil moisture sensor (c) a rain sensor (d) a sound sensor
35. 35.🔍 Which sensor would you use to close a window in rain? (a) a rain sensor (b) a light sensor (c) a motion sensor (d) a distance sensor
36. 36.True or false: to make a parking alarm, use a light sensor. (a) True (b) False
37. 37.Which job needs a rain sensor? (a) spot someone walking in (b) close a window in rain (c) make a parking alarm (d) keep an incubator warm
38. 38.⚙️ Which actuator would you use to turn to an exact angle? (a) a display (b) a servo motor (c) an LED (d) a pump
39. 39.🔍 Which sensor would you use to warn of a gas leak? (a) a light sensor (b) a rain sensor (c) a distance sensor (d) a gas sensor
40. 40.True or false: to warn of a gas leak, use a distance sensor. (a) True (b) False

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