Electronics Worksheet: Sensors and Actuators

Electronics lesson 26: Sensors and actuators · Set 287 · 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 actuator would you use to move water to plants? (a) a motor (b) a pump (c) a servo motor (d) a display
2. 2.True or false: to spot someone walking in, use a gas sensor. (a) True (b) False
3. 3.🔍 Which sensor would you use to switch on lamps at dusk? (a) a light sensor (b) a sound sensor (c) a soil moisture sensor (d) a rain sensor
4. 4.🔍 Which sensor would you use to make a parking alarm? (a) a motion sensor (b) a rain sensor (c) a temperature sensor (d) a distance sensor
5. 5.⚙️ What is an actuator? (a) a sensor (b) a program (c) an output that acts (d) a battery
6. 6.🔍 An object is 306 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
7. 7.Which job needs a temperature sensor? (a) keep an incubator warm (b) make a parking alarm (c) water a dry plant (d) measure classroom noise
8. 8.🔍 For a microcontroller, is a sensor an input or an output? (a) a fuse (b) an input (c) an output (d) a power source
9. 9.Which job needs a servo motor? (a) spin a robot’s wheels (b) turn to an exact angle (c) show a status light (d) show the temperature
10. 10.Which job needs an LED? (a) turn to an exact angle (b) show a status light (c) beep an alarm (d) spin a robot’s wheels
11. 11.🔍 Which sensor would you use to measure classroom noise? (a) a distance sensor (b) a temperature sensor (c) a sound sensor (d) a motion sensor
12. 12.Which job needs a soil moisture sensor? (a) close a window in rain (b) water a dry plant (c) start a fan when hot (d) keep an incubator warm
13. 13.Which job needs a distance sensor? (a) spot someone walking in (b) warn of a gas leak (c) make a parking alarm (d) keep an incubator warm
14. 14.⚙️ Which actuator would you use to spin a robot’s wheels? (a) a buzzer (b) an LED (c) a motor (d) a servo motor
15. 15.Which job needs a servo motor? (a) move water to plants (b) spin a robot’s wheels (c) open a gate to 90° (d) show a status light
16. 16.Which job needs a sound sensor? (a) keep an incubator warm (b) stop a robot near walls (c) warn of a gas leak (d) switch on with a clap
17. 17.True or false: to warn of a gas leak, use a distance sensor. (a) False (b) True
18. 18.True or false: to switch on with a clap, use a sound sensor. (a) True (b) False
19. 19.⚙️ Which actuator would you use to beep an alarm? (a) a display (b) a pump (c) a buzzer (d) a motor
20. 20.🔍 Which sensor would you use to stop a robot near walls? (a) a temperature sensor (b) a distance sensor (c) a motion sensor (d) a light sensor
21. 21.Which job needs a pump? (a) move water to plants (b) beep an alarm (c) turn to an exact angle (d) show a status light
22. 22.🔍 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)?
23. 23.True or false: to stop a robot near walls, use a distance sensor. (a) True (b) False
24. 24.🔍 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)?
25. 25.🔍 An object is 272 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
26. 26.🔍 A distance sensor sends a sound pulse and hears the echo 15 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
27. 27.Which job needs a light sensor? (a) start a fan when hot (b) open blinds at sunrise (c) water a dry plant (d) keep an incubator warm
28. 28.Which job needs a distance sensor? (a) stop a robot near walls (b) keep an incubator warm (c) start a fan when hot (d) switch on with a clap
29. 29.Which job needs a motor? (a) beep an alarm (b) spin a robot’s wheels (c) show the temperature (d) show a status light
30. 30.⚙️ Which actuator would you use to show a status light? (a) an LED (b) a display (c) a servo motor (d) a pump
31. 31.🔍 An object is 255 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
32. 32.True or false: to measure classroom noise, use a sound sensor. (a) True (b) False
33. 33.⚙️ Which actuator would you use to show the temperature? (a) a motor (b) a display (c) a servo motor (d) a buzzer
34. 34.⚙️ Which actuator would you use to turn to an exact angle? (a) a display (b) a pump (c) an LED (d) a servo motor
35. 35.True or false: to warn of a gas leak, use a gas sensor. (a) True (b) False
36. 36.Which job needs a buzzer? (a) beep an alarm (b) move water to plants (c) show the temperature (d) spin a robot’s wheels
37. 37.🔍 Which sensor would you use to warn of a gas leak? (a) a gas sensor (b) a rain sensor (c) a temperature sensor (d) a sound sensor
38. 38.🔍 Which sensor would you use to switch on with a clap? (a) a light sensor (b) a distance sensor (c) a motion sensor (d) a sound sensor
39. 39.🔍 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)?
40. 40.⚙️ Which actuator would you use to open a gate to 90°? (a) an LED (b) a motor (c) a pump (d) a servo motor

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