Electronics Worksheet: Sensors and Actuators

Electronics lesson 26: Sensors and actuators · Set 290 · 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 spin a robot’s wheels? (a) an LED (b) a pump (c) a display (d) a motor
2. 2.🔍 For a microcontroller, is a sensor an input or an output? (a) a fuse (b) an input (c) a power source (d) an output
3. 3.🔍 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)?
4. 4.🔍 Which sensor would you use to make a parking alarm? (a) a light sensor (b) a distance sensor (c) a gas sensor (d) a sound sensor
5. 5.🔍 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?
6. 6.🔍 A distance sensor sends a sound pulse and hears the echo 8 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
7. 7.Which job needs a sound sensor? (a) switch on lamps at dusk (b) water a dry plant (c) open blinds at sunrise (d) switch on with a clap
8. 8.Which job needs a light sensor? (a) make a parking alarm (b) stop a robot near walls (c) open blinds at sunrise (d) warn of a gas leak
9. 9.🔍 Which sensor would you use to spot someone walking in? (a) a rain sensor (b) a soil moisture sensor (c) a sound sensor (d) a motion sensor
10. 10.⚙️ Which actuator would you use to show the temperature? (a) an LED (b) a buzzer (c) a pump (d) a display
11. 11.🔍 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?
12. 12.🔍 Which sensor would you use to switch on lamps at dusk? (a) a temperature sensor (b) a sound sensor (c) a distance sensor (d) a light sensor
13. 13.🔍 Which sensor would you use to keep an incubator warm? (a) a light sensor (b) a sound sensor (c) a gas sensor (d) a temperature sensor
14. 14.Which job needs a buzzer? (a) open a gate to 90° (b) show a status light (c) turn to an exact angle (d) beep an alarm
15. 15.🔍 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)?
16. 16.⚙️ What is an actuator? (a) a program (b) a sensor (c) an output that acts (d) a battery
17. 17.Which job needs a motion sensor? (a) keep an incubator warm (b) spot someone walking in (c) warn of a gas leak (d) switch on lamps at dusk
18. 18.⚙️ Which actuator would you use to open a gate to 90°? (a) a pump (b) a buzzer (c) a servo motor (d) an LED
19. 19.⚙️ Which actuator would you use to beep an alarm? (a) a servo motor (b) a buzzer (c) an LED (d) a pump
20. 20.⚙️ Which actuator would you use to show a status light? (a) a servo motor (b) a buzzer (c) an LED (d) a display
21. 21.Which job needs a distance sensor? (a) water a dry plant (b) switch on with a clap (c) spot someone walking in (d) make a parking alarm
22. 22.Which job needs a soil moisture sensor? (a) water a dry plant (b) start a fan when hot (c) keep an incubator warm (d) make a parking alarm
23. 23.🔍 A distance sensor sends a sound pulse and hears the echo 10 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
24. 24.⚙️ Which actuator would you use to turn to an exact angle? (a) a pump (b) a motor (c) a servo motor (d) a buzzer
25. 25.Which job needs an LED? (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 rain sensor? (a) keep an incubator warm (b) close a window in rain (c) make a parking alarm (d) water a dry plant
27. 27.🔍 Which sensor would you use to measure classroom noise? (a) a motion sensor (b) a soil moisture sensor (c) a temperature sensor (d) a sound sensor
28. 28.True or false: to open blinds at sunrise, use a light sensor. (a) False (b) True
29. 29.🔍 A distance sensor sends a sound pulse and hears the echo 20 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
30. 30.True or false: to close a window in rain, use a rain sensor. (a) False (b) True
31. 31.Which job needs a temperature sensor? (a) stop a robot near walls (b) start a fan when hot (c) spot someone walking in (d) switch on with a clap
32. 32.Which job needs a light sensor? (a) switch on with a clap (b) switch on lamps at dusk (c) make a parking alarm (d) keep an incubator warm
33. 33.Which job needs a display? (a) turn to an exact angle (b) open a gate to 90° (c) show the temperature (d) spin a robot’s wheels
34. 34.🔍 Which sensor would you use to open blinds at sunrise? (a) a gas sensor (b) a distance sensor (c) a motion sensor (d) a light sensor
35. 35.True or false: to close a window in rain, use a motion sensor. (a) False (b) True
36. 36.🔍 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?
37. 37.🔍 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)?
38. 38.🔍 A distance sensor sends a sound pulse and hears the echo 14 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
39. 39.⚙️ Which actuator would you use to move water to plants? (a) a pump (b) an LED (c) a servo motor (d) a buzzer
40. 40.Which job needs a motor? (a) spin a robot’s wheels (b) turn to an exact angle (c) beep an alarm (d) show a status light

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