Electronics Worksheet: Sensors and Actuators

Electronics lesson 26: Sensors and actuators · Set 207 · 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 beep an alarm? (a) a buzzer (b) a pump (c) a motor (d) a display
2. 2.🔍 Which sensor would you use to switch on lamps at dusk? (a) a temperature sensor (b) a gas sensor (c) a motion sensor (d) a light sensor
3. 3.🔍 Which sensor would you use to switch on with a clap? (a) a gas sensor (b) a sound sensor (c) a motion sensor (d) a soil moisture sensor
4. 4.🔍 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)?
5. 5.🔍 Which sensor would you use to stop a robot near walls? (a) a temperature sensor (b) a gas sensor (c) a soil moisture sensor (d) a distance sensor
6. 6.🔍 An object is 340 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
7. 7.⚙️ What is an actuator? (a) a sensor (b) an output that acts (c) a program (d) a battery
8. 8.🔍 Which sensor would you use to start a fan when hot? (a) a distance sensor (b) a motion sensor (c) a soil moisture sensor (d) a temperature sensor
9. 9.🔍 For a microcontroller, is a sensor an input or an output? (a) a fuse (b) an input (c) a power source (d) an output
10. 10.Which job needs a light sensor? (a) close a window in rain (b) switch on lamps at dusk (c) stop a robot near walls (d) start a fan when hot
11. 11.Which job needs a soil moisture sensor? (a) open blinds at sunrise (b) stop a robot near walls (c) water a dry plant (d) make a parking alarm
12. 12.⚙️ Which actuator would you use to spin a robot’s wheels? (a) a motor (b) a pump (c) a servo motor (d) a display
13. 13.True or false: to measure classroom noise, use a light sensor. (a) True (b) False
14. 14.Which job needs a distance sensor? (a) make a parking alarm (b) warn of a gas leak (c) measure classroom noise (d) keep an incubator warm
15. 15.Which job needs a rain sensor? (a) close a window in rain (b) start a fan when hot (c) stop a robot near walls (d) warn of a gas leak
16. 16.True or false: to switch on lamps at dusk, use a soil moisture sensor. (a) True (b) False
17. 17.Which job needs a motor? (a) turn to an exact angle (b) beep an alarm (c) show a status light (d) spin a robot’s wheels
18. 18.🔍 Which sensor would you use to measure classroom noise? (a) a rain sensor (b) a temperature sensor (c) a sound sensor (d) a gas sensor
19. 19.⚙️ Which actuator would you use to show a status light? (a) an LED (b) a display (c) a pump (d) a servo motor
20. 20.🔍 Which sensor would you use to water a dry plant? (a) a temperature sensor (b) a soil moisture sensor (c) a light sensor (d) a sound sensor
21. 21.Which job needs a sound sensor? (a) start a fan when hot (b) spot someone walking in (c) keep an incubator warm (d) measure classroom noise
22. 22.Which job needs a distance sensor? (a) keep an incubator warm (b) close a window in rain (c) warn of a gas leak (d) stop a robot near walls
23. 23.Which job needs a light sensor? (a) make a parking alarm (b) open blinds at sunrise (c) switch on with a clap (d) stop a robot near walls
24. 24.Which job needs a servo motor? (a) spin a robot’s wheels (b) show a status light (c) beep an alarm (d) open a gate to 90°
25. 25.Which job needs an LED? (a) beep an alarm (b) move water to plants (c) show the temperature (d) show a status light
26. 26.🔍 Which sensor would you use to make a parking alarm? (a) a temperature sensor (b) a rain sensor (c) a distance sensor (d) a light sensor
27. 27.True or false: to start a fan when hot, use a light sensor. (a) True (b) False
28. 28.🔍 Which sensor would you use to close a window in rain? (a) a rain sensor (b) a soil moisture sensor (c) a distance sensor (d) a temperature sensor
29. 29.⚙️ Which actuator would you use to move water to plants? (a) a pump (b) a servo motor (c) an LED (d) a display
30. 30.🔍 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)?
31. 31.🔍 An object is 221 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
32. 32.🔍 Which sensor would you use to open blinds at sunrise? (a) a light sensor (b) a sound sensor (c) a soil moisture sensor (d) a distance sensor
33. 33.🔍 An object is 204 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
34. 34.🔍 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)?
35. 35.Which job needs a motion sensor? (a) warn of a gas leak (b) close a window in rain (c) water a dry plant (d) spot someone walking in
36. 36.⚙️ Which actuator would you use to turn to an exact angle? (a) a pump (b) a display (c) a buzzer (d) a servo motor
37. 37.⚙️ Which actuator would you use to open a gate to 90°? (a) an LED (b) a servo motor (c) a motor (d) a display
38. 38.🔍 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)?
39. 39.Which job needs a temperature sensor? (a) keep an incubator warm (b) switch on lamps at dusk (c) spot someone walking in (d) open blinds at sunrise
40. 40.🔍 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?

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