Electronics Worksheet: Sensors and Actuators

Electronics lesson 26: Sensors and actuators · Set 142 · 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 buzzer? (a) beep an alarm (b) turn to an exact angle (c) show the temperature (d) spin a robot’s wheels
2. 2.⚙️ Which actuator would you use to beep an alarm? (a) an LED (b) a display (c) a pump (d) a buzzer
3. 3.Which job needs a sound sensor? (a) keep an incubator warm (b) open blinds at sunrise (c) switch on with a clap (d) close a window in rain
4. 4.🔍 For a microcontroller, is a sensor an input or an output? (a) an input (b) a power source (c) a fuse (d) an output
5. 5.🔍 Which sensor would you use to warn of a gas leak? (a) a rain sensor (b) a distance sensor (c) a gas sensor (d) a sound sensor
6. 6.Which job needs an LED? (a) spin a robot’s wheels (b) show the temperature (c) show a status light (d) beep an alarm
7. 7.🔍 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)?
8. 8.Which job needs a light sensor? (a) make a parking alarm (b) open blinds at sunrise (c) switch on with a clap (d) start a fan when hot
9. 9.🔍 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?
10. 10.Which job needs a temperature sensor? (a) make a parking alarm (b) warn of a gas leak (c) start a fan when hot (d) measure classroom noise
11. 11.⚙️ What is an actuator? (a) a battery (b) a program (c) a sensor (d) an output that acts
12. 12.🔍 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)?
13. 13.True or false: to start a fan when hot, use a distance sensor. (a) True (b) False
14. 14.🔍 A distance sensor sends a sound pulse and hears the echo 5 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
15. 15.True or false: to water a dry plant, use a gas sensor. (a) False (b) True
16. 16.Which job needs a soil moisture sensor? (a) spot someone walking in (b) warn of a gas leak (c) water a dry plant (d) make a parking alarm
17. 17.🔍 Which sensor would you use to open blinds at sunrise? (a) a light sensor (b) a motion sensor (c) a temperature sensor (d) a soil moisture sensor
18. 18.Which job needs a rain sensor? (a) make a parking alarm (b) close a window in rain (c) stop a robot near walls (d) switch on with a clap
19. 19.True or false: to water a dry plant, use a soil moisture sensor. (a) False (b) True
20. 20.Which job needs a servo motor? (a) show the temperature (b) beep an alarm (c) spin a robot’s wheels (d) turn to an exact angle
21. 21.🔍 Which sensor would you use to keep an incubator warm? (a) a temperature sensor (b) a gas sensor (c) a motion sensor (d) a distance sensor
22. 22.⚙️ Which actuator would you use to turn to an exact angle? (a) a buzzer (b) a pump (c) a servo motor (d) an LED
23. 23.True or false: to start a fan when hot, use a light sensor. (a) False (b) True
24. 24.⚙️ Which actuator would you use to show the temperature? (a) a display (b) a buzzer (c) a pump (d) a motor
25. 25.Which job needs a pump? (a) move water to plants (b) spin a robot’s wheels (c) show a status light (d) open a gate to 90°
26. 26.Which job needs a servo motor? (a) show the temperature (b) beep an alarm (c) move water to plants (d) open a gate to 90°
27. 27.🔍 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?
28. 28.🔍 Which sensor would you use to start a fan when hot? (a) a sound sensor (b) a motion sensor (c) a light sensor (d) a temperature sensor
29. 29.⚙️ Which actuator would you use to open a gate to 90°? (a) a motor (b) an LED (c) a pump (d) a servo motor
30. 30.True or false: to close a window in rain, use a soil moisture sensor. (a) True (b) False
31. 31.🔍 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)?
32. 32.Which job needs a temperature sensor? (a) spot someone walking in (b) measure classroom noise (c) switch on lamps at dusk (d) keep an incubator warm
33. 33.🔍 Which sensor would you use to measure classroom noise? (a) a motion sensor (b) a sound sensor (c) a distance sensor (d) a temperature sensor
34. 34.⚙️ Which actuator would you use to move water to plants? (a) an LED (b) a pump (c) a buzzer (d) a motor
35. 35.True or false: to spot someone walking in, use a motion sensor. (a) False (b) True
36. 36.Which job needs a light sensor? (a) warn of a gas leak (b) switch on lamps at dusk (c) stop a robot near walls (d) switch on with a clap
37. 37.🔍 Which sensor would you use to stop a robot near walls? (a) a distance sensor (b) a motion sensor (c) a rain sensor (d) a temperature sensor
38. 38.🔍 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)?
39. 39.🔍 Which sensor would you use to switch on lamps at dusk? (a) a rain sensor (b) a light sensor (c) a temperature sensor (d) a gas sensor
40. 40.Which job needs a gas sensor? (a) keep an incubator warm (b) make a parking alarm (c) warn of a gas leak (d) stop a robot near walls

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