Electronics Worksheet: Sensors and Actuators

Electronics lesson 26: Sensors and actuators · Set 118 · 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 turn to an exact angle? (a) a buzzer (b) a display (c) a servo motor (d) an LED
2. 2.🔍 Which sensor would you use to make a parking alarm? (a) a distance sensor (b) a sound sensor (c) a temperature sensor (d) a soil moisture sensor
3. 3.🔍 Which sensor would you use to start a fan when hot? (a) a sound sensor (b) a temperature sensor (c) a rain sensor (d) a distance sensor
4. 4.🔍 A distance sensor sends a sound pulse and hears the echo 11 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 measure classroom noise? (a) a soil moisture sensor (b) a rain sensor (c) a sound sensor (d) a temperature sensor
6. 6.Which job needs a light sensor? (a) water a dry plant (b) warn of a gas leak (c) keep an incubator warm (d) switch on lamps at dusk
7. 7.🔍 Which sensor would you use to stop a robot near walls? (a) a gas sensor (b) a distance sensor (c) a soil moisture sensor (d) a light sensor
8. 8.🔍 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)?
9. 9.Which job needs an LED? (a) show the temperature (b) show a status light (c) spin a robot’s wheels (d) turn to an exact angle
10. 10.🔍 Which sensor would you use to open blinds at sunrise? (a) a light sensor (b) a rain sensor (c) a sound sensor (d) a gas sensor
11. 11.Which job needs a servo motor? (a) move water to plants (b) beep an alarm (c) turn to an exact angle (d) show the temperature
12. 12.Which job needs a distance sensor? (a) open blinds at sunrise (b) make a parking alarm (c) switch on lamps at dusk (d) switch on with a clap
13. 13.Which job needs a pump? (a) spin a robot’s wheels (b) show the temperature (c) show a status light (d) move water to plants
14. 14.⚙️ Which actuator would you use to open a gate to 90°? (a) a buzzer (b) a servo motor (c) a pump (d) an LED
15. 15.🔍 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)?
16. 16.True or false: to switch on with a clap, use a sound sensor. (a) True (b) False
17. 17.⚙️ What is an actuator? (a) a program (b) a battery (c) a sensor (d) an output that acts
18. 18.🔍 For a microcontroller, is a sensor an input or an output? (a) a fuse (b) a power source (c) an output (d) an input
19. 19.Which job needs a gas sensor? (a) warn of a gas leak (b) spot someone walking in (c) open blinds at sunrise (d) stop a robot near walls
20. 20.True or false: to close a window in rain, use a rain sensor. (a) True (b) False
21. 21.Which job needs a display? (a) open a gate to 90° (b) beep an alarm (c) spin a robot’s wheels (d) show the temperature
22. 22.🔍 An object is 119 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
23. 23.True or false: to measure classroom noise, use a gas sensor. (a) False (b) True
24. 24.⚙️ Which actuator would you use to show the temperature? (a) a motor (b) a buzzer (c) a servo motor (d) a display
25. 25.True or false: to start a fan when hot, use a motion sensor. (a) False (b) True
26. 26.Which job needs a rain sensor? (a) close a window in rain (b) make a parking alarm (c) open blinds at sunrise (d) start a fan when hot
27. 27.Which job needs a servo motor? (a) beep an alarm (b) move water to plants (c) spin a robot’s wheels (d) open a gate to 90°
28. 28.True or false: to switch on lamps at dusk, use a light sensor. (a) True (b) False
29. 29.⚙️ Which actuator would you use to show a status light? (a) a buzzer (b) a motor (c) an LED (d) a servo motor
30. 30.⚙️ Which actuator would you use to move water to plants? (a) a pump (b) a buzzer (c) a motor (d) an LED
31. 31.True or false: to measure classroom noise, use a sound sensor. (a) True (b) False
32. 32.🔍 Which sensor would you use to switch on with a clap? (a) a soil moisture sensor (b) a distance sensor (c) a sound sensor (d) a rain sensor
33. 33.🔍 Which sensor would you use to switch on lamps at dusk? (a) a motion sensor (b) a temperature sensor (c) a distance sensor (d) a light sensor
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.True or false: to spot someone walking in, use a sound sensor. (a) False (b) True
36. 36.🔍 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?
37. 37.True or false: to make a parking alarm, use a motion sensor. (a) True (b) False
38. 38.True or false: to switch on lamps at dusk, use a distance sensor. (a) True (b) False
39. 39.🔍 An object is 85 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
40. 40.Which job needs a distance sensor? (a) close a window in rain (b) stop a robot near walls (c) start a fan when hot (d) switch on with a clap

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