Electronics Worksheet: Sensors and Actuators

Electronics lesson 26: Sensors and actuators · Set 273 · 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 sensor would you use to spot someone walking in? (a) a light sensor (b) a motion sensor (c) a distance sensor (d) a sound sensor
2. 2.🔍 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)?
3. 3.⚙️ What is an actuator? (a) an output that acts (b) a sensor (c) a battery (d) a program
4. 4.Which job needs a light sensor? (a) switch on lamps at dusk (b) start a fan when hot (c) spot someone walking in (d) measure classroom noise
5. 5.🔍 Which sensor would you use to switch on lamps at dusk? (a) a rain sensor (b) a temperature sensor (c) a distance sensor (d) a light sensor
6. 6.Which job needs a motion sensor? (a) spot someone walking in (b) keep an incubator warm (c) make a parking alarm (d) switch on with a clap
7. 7.True or false: to open blinds at sunrise, use a motion sensor. (a) True (b) False
8. 8.⚙️ Which actuator would you use to beep an alarm? (a) a motor (b) an LED (c) a display (d) a buzzer
9. 9.🔍 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?
10. 10.🔍 A distance sensor sends a sound pulse and hears the echo 16 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
11. 11.🔍 For a microcontroller, is a sensor an input or an output? (a) an output (b) a fuse (c) a power source (d) an input
12. 12.Which job needs a motor? (a) move water to plants (b) beep an alarm (c) turn to an exact angle (d) spin a robot’s wheels
13. 13.Which job needs a temperature sensor? (a) measure classroom noise (b) switch on with a clap (c) start a fan when hot (d) close a window in rain
14. 14.⚙️ Which actuator would you use to open a gate to 90°? (a) an LED (b) a pump (c) a motor (d) a servo motor
15. 15.⚙️ Which actuator would you use to move water to plants? (a) a pump (b) a servo motor (c) a buzzer (d) a motor
16. 16.Which job needs a temperature sensor? (a) open blinds at sunrise (b) switch on lamps at dusk (c) keep an incubator warm (d) close a window in rain
17. 17.🔍 Which sensor would you use to warn of a gas leak? (a) a soil moisture sensor (b) a rain sensor (c) a distance sensor (d) a gas sensor
18. 18.True or false: to measure classroom noise, use a rain sensor. (a) True (b) False
19. 19.⚙️ Which actuator would you use to spin a robot’s wheels? (a) an LED (b) a buzzer (c) a display (d) a motor
20. 20.Which job needs a soil moisture sensor? (a) switch on lamps at dusk (b) water a dry plant (c) spot someone walking in (d) warn of a gas leak
21. 21.Which job needs an LED? (a) show the temperature (b) turn to an exact angle (c) beep an alarm (d) show a status light
22. 22.🔍 Which sensor would you use to switch on with a clap? (a) a gas sensor (b) a distance sensor (c) a sound sensor (d) a temperature sensor
23. 23.True or false: to warn of a gas leak, use a soil moisture sensor. (a) False (b) True
24. 24.True or false: to switch on with a clap, use a sound sensor. (a) True (b) False
25. 25.Which job needs a buzzer? (a) turn to an exact angle (b) move water to plants (c) beep an alarm (d) show the temperature
26. 26.True or false: to spot someone walking in, use a rain sensor. (a) True (b) False
27. 27.🔍 An object is 51 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
28. 28.🔍 Which sensor would you use to keep an incubator warm? (a) a rain sensor (b) a gas sensor (c) a temperature sensor (d) a light sensor
29. 29.Which job needs a rain sensor? (a) stop a robot near walls (b) make a parking alarm (c) close a window in rain (d) switch on lamps at dusk
30. 30.🔍 Which sensor would you use to measure classroom noise? (a) a sound sensor (b) a gas sensor (c) a soil moisture sensor (d) a distance sensor
31. 31.Which job needs a gas sensor? (a) warn of a gas leak (b) switch on with a clap (c) spot someone walking in (d) open blinds at sunrise
32. 32.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°
33. 33.Which job needs a distance sensor? (a) open blinds at sunrise (b) stop a robot near walls (c) switch on lamps at dusk (d) start a fan when hot
34. 34.Which job needs a servo motor? (a) show the temperature (b) beep an alarm (c) move water to plants (d) turn to an exact angle
35. 35.⚙️ Which actuator would you use to show the temperature? (a) an LED (b) a display (c) a servo motor (d) a pump
36. 36.True or false: to start a fan when hot, use a gas sensor. (a) False (b) True
37. 37.🔍 Which sensor would you use to open blinds at sunrise? (a) a temperature sensor (b) a distance sensor (c) a light sensor (d) a rain sensor
38. 38.True or false: to make a parking alarm, use a motion sensor. (a) False (b) True
39. 39.🔍 Which sensor would you use to make a parking alarm? (a) a motion sensor (b) a distance sensor (c) a gas sensor (d) a rain sensor
40. 40.Which job needs a display? (a) show a status light (b) beep an alarm (c) turn to an exact angle (d) show the temperature

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