Electronics Worksheet: Sensors and Actuators

Electronics lesson 26: Sensors and actuators · Set 191 · 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.🔍 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)?
2. 2.⚙️ Which actuator would you use to turn to an exact angle? (a) a buzzer (b) a motor (c) a pump (d) a servo motor
3. 3.🔍 For a microcontroller, is a sensor an input or an output? (a) a power source (b) an input (c) an output (d) a fuse
4. 4.🔍 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)?
5. 5.Which job needs a distance sensor? (a) switch on lamps at dusk (b) make a parking alarm (c) start a fan when hot (d) keep an incubator warm
6. 6.⚙️ Which actuator would you use to move water to plants? (a) a servo motor (b) a pump (c) a buzzer (d) a display
7. 7.Which job needs a motion sensor? (a) spot someone walking in (b) switch on with a clap (c) make a parking alarm (d) close a window in rain
8. 8.Which job needs a buzzer? (a) turn to an exact angle (b) beep an alarm (c) show the temperature (d) spin a robot’s wheels
9. 9.🔍 Which sensor would you use to open blinds at sunrise? (a) a distance sensor (b) a rain sensor (c) a sound sensor (d) a light sensor
10. 10.⚙️ What is an actuator? (a) a program (b) a battery (c) a sensor (d) an output that acts
11. 11.True or false: to switch on lamps at dusk, use a light sensor. (a) True (b) False
12. 12.True or false: to make a parking alarm, use a distance sensor. (a) False (b) True
13. 13.True or false: to warn of a gas leak, use a light sensor. (a) False (b) True
14. 14.Which job needs a temperature sensor? (a) switch on lamps at dusk (b) water a dry plant (c) start a fan when hot (d) stop a robot near walls
15. 15.True or false: to start a fan when hot, use a distance sensor. (a) False (b) True
16. 16.🔍 A distance sensor sends a sound pulse and hears the echo 13 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
17. 17.🔍 Which sensor would you use to start a fan when hot? (a) a distance sensor (b) a rain sensor (c) a temperature sensor (d) a sound sensor
18. 18.🔍 Which sensor would you use to spot someone walking in? (a) a temperature sensor (b) a gas sensor (c) a motion sensor (d) a distance sensor
19. 19.⚙️ Which actuator would you use to show the temperature? (a) an LED (b) a display (c) a motor (d) a pump
20. 20.True or false: to measure classroom noise, use a distance sensor. (a) False (b) True
21. 21.True or false: to open blinds at sunrise, use a light sensor. (a) False (b) True
22. 22.Which job needs a rain sensor? (a) make a parking alarm (b) close a window in rain (c) switch on with a clap (d) switch on lamps at dusk
23. 23.True or false: to start a fan when hot, use a temperature sensor. (a) True (b) False
24. 24.Which job needs an LED? (a) spin a robot’s wheels (b) turn to an exact angle (c) beep an alarm (d) show a status light
25. 25.Which job needs a servo motor? (a) move water to plants (b) turn to an exact angle (c) beep an alarm (d) show a status light
26. 26.⚙️ Which actuator would you use to beep an alarm? (a) a buzzer (b) a servo motor (c) an LED (d) a display
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.Which job needs a distance sensor? (a) open blinds at sunrise (b) stop a robot near walls (c) spot someone walking in (d) switch on lamps at dusk
29. 29.Which job needs a motor? (a) beep an alarm (b) turn to an exact angle (c) spin a robot’s wheels (d) show the temperature
30. 30.🔍 A distance sensor sends a sound pulse and hears the echo 5 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
31. 31.True or false: to open blinds at sunrise, use a temperature sensor. (a) False (b) True
32. 32.Which job needs a sound sensor? (a) stop a robot near walls (b) water a dry plant (c) switch on with a clap (d) close a window in rain
33. 33.True or false: to stop a robot near walls, use a temperature sensor. (a) True (b) False
34. 34.⚙️ Which actuator would you use to spin a robot’s wheels? (a) a servo motor (b) a motor (c) a pump (d) an LED
35. 35.🔍 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)?
36. 36.True or false: to make a parking alarm, use a rain sensor. (a) False (b) True
37. 37.True or false: to switch on lamps at dusk, use a rain sensor. (a) False (b) True
38. 38.🔍 Which sensor would you use to stop a robot near walls? (a) a distance sensor (b) a motion sensor (c) a gas sensor (d) a light sensor
39. 39.🔍 Which sensor would you use to warn of a gas leak? (a) a distance sensor (b) a gas sensor (c) a sound sensor (d) a soil moisture sensor
40. 40.True or false: to make a parking alarm, use a soil moisture sensor. (a) True (b) False

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