Electronics Worksheet: Sensors and Actuators

Electronics lesson 26: Sensors and actuators · Set 307 · 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.True or false: to switch on with a clap, use a light sensor. (a) True (b) False
2. 2.⚙️ What is an actuator? (a) an output that acts (b) a program (c) a sensor (d) a battery
3. 3.🔍 Which sensor would you use to open blinds at sunrise? (a) a sound sensor (b) a temperature sensor (c) a light sensor (d) a motion sensor
4. 4.Which job needs a sound sensor? (a) switch on lamps at dusk (b) water a dry plant (c) switch on with a clap (d) open blinds at sunrise
5. 5.Which job needs a buzzer? (a) show a status light (b) spin a robot’s wheels (c) show the temperature (d) beep an alarm
6. 6.Which job needs a motion sensor? (a) switch on lamps at dusk (b) water a dry plant (c) spot someone walking in (d) measure classroom noise
7. 7.🔍 For a microcontroller, is a sensor an input or an output? (a) a power source (b) an output (c) a fuse (d) an input
8. 8.⚙️ Which actuator would you use to open a gate to 90°? (a) an LED (b) a motor (c) a servo motor (d) a buzzer
9. 9.Which job needs a servo motor? (a) spin a robot’s wheels (b) show a status light (c) show the temperature (d) open a gate to 90°
10. 10.🔍 An object is 17 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
11. 11.🔍 An object is 170 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
12. 12.⚙️ Which actuator would you use to show a status light? (a) an LED (b) a buzzer (c) a pump (d) a servo motor
13. 13.Which job needs a servo motor? (a) beep an alarm (b) spin a robot’s wheels (c) show a status light (d) turn to an exact angle
14. 14.🔍 An object is 187 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
15. 15.⚙️ Which actuator would you use to show the temperature? (a) a pump (b) a buzzer (c) a motor (d) a display
16. 16.🔍 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)?
17. 17.⚙️ Which actuator would you use to turn to an exact angle? (a) a servo motor (b) a buzzer (c) a motor (d) an LED
18. 18.🔍 Which sensor would you use to spot someone walking in? (a) a rain sensor (b) a sound sensor (c) a temperature sensor (d) a motion sensor
19. 19.True or false: to switch on with a clap, use a sound sensor. (a) False (b) True
20. 20.Which job needs a light sensor? (a) open blinds at sunrise (b) start a fan when hot (c) close a window in rain (d) keep an incubator warm
21. 21.True or false: to open blinds at sunrise, use a light sensor. (a) True (b) False
22. 22.True or false: to measure classroom noise, use a rain sensor. (a) False (b) True
23. 23.🔍 An object is 323 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
24. 24.🔍 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?
25. 25.⚙️ Which actuator would you use to move water to plants? (a) a buzzer (b) a pump (c) a display (d) a motor
26. 26.🔍 An object is 68 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
27. 27.Which job needs a light sensor? (a) switch on lamps at dusk (b) water a dry plant (c) start a fan when hot (d) make a parking alarm
28. 28.🔍 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?
29. 29.🔍 Which sensor would you use to measure classroom noise? (a) a temperature sensor (b) a light sensor (c) a gas sensor (d) a sound sensor
30. 30.Which job needs a distance sensor? (a) open blinds at sunrise (b) stop a robot near walls (c) warn of a gas leak (d) close a window in rain
31. 31.True or false: to stop a robot near walls, use a distance sensor. (a) False (b) True
32. 32.True or false: to close a window in rain, use a rain sensor. (a) False (b) True
33. 33.🔍 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?
34. 34.Which job needs a pump? (a) show the temperature (b) open a gate to 90° (c) spin a robot’s wheels (d) move water to plants
35. 35.Which job needs a temperature sensor? (a) make a parking alarm (b) measure classroom noise (c) switch on with a clap (d) keep an incubator warm
36. 36.Which job needs an LED? (a) beep an alarm (b) show the temperature (c) show a status light (d) open a gate to 90°
37. 37.Which job needs a gas sensor? (a) make a parking alarm (b) warn of a gas leak (c) switch on lamps at dusk (d) stop a robot near walls
38. 38.🔍 Which sensor would you use to start a fan when hot? (a) a motion sensor (b) a distance sensor (c) a temperature sensor (d) a soil moisture sensor
39. 39.🔍 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)?
40. 40.🔍 Which sensor would you use to make a parking alarm? (a) a rain sensor (b) a gas sensor (c) a distance sensor (d) a soil moisture sensor

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