Electronics Worksheet: Sensors and Actuators

Electronics lesson 26: Sensors and actuators · Set 64 · 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 start a fan when hot? (a) a rain sensor (b) a motion sensor (c) a light sensor (d) a temperature sensor
2. 2.Which job needs a sound sensor? (a) measure classroom noise (b) start a fan when hot (c) make a parking alarm (d) spot someone walking in
3. 3.🔍 For a microcontroller, is a sensor an input or an output? (a) a power source (b) a fuse (c) an input (d) an output
4. 4.Which job needs a temperature sensor? (a) close a window in rain (b) stop a robot near walls (c) start a fan when hot (d) open blinds at sunrise
5. 5.Which job needs a temperature sensor? (a) spot someone walking in (b) close a window in rain (c) keep an incubator warm (d) make a parking alarm
6. 6.⚙️ Which actuator would you use to turn to an exact angle? (a) a buzzer (b) a display (c) a servo motor (d) an LED
7. 7.🔍 Which sensor would you use to switch on lamps at dusk? (a) a motion sensor (b) a distance sensor (c) a soil moisture sensor (d) a light sensor
8. 8.True or false: to switch on lamps at dusk, use a motion sensor. (a) True (b) False
9. 9.Which job needs a light sensor? (a) warn of a gas leak (b) spot someone walking in (c) measure classroom noise (d) switch on lamps at dusk
10. 10.Which job needs a display? (a) turn to an exact angle (b) spin a robot’s wheels (c) beep an alarm (d) show the temperature
11. 11.🔍 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?
12. 12.Which job needs a pump? (a) spin a robot’s wheels (b) beep an alarm (c) move water to plants (d) turn to an exact angle
13. 13.🔍 Which sensor would you use to measure classroom noise? (a) a temperature sensor (b) a distance sensor (c) a sound sensor (d) a soil moisture sensor
14. 14.🔍 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)?
15. 15.🔍 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?
16. 16.⚙️ Which actuator would you use to move water to plants? (a) a display (b) an LED (c) a buzzer (d) a pump
17. 17.Which job needs a gas sensor? (a) water a dry plant (b) spot someone walking in (c) start a fan when hot (d) warn of a gas leak
18. 18.🔍 Which sensor would you use to open blinds at sunrise? (a) a light sensor (b) a distance sensor (c) a sound sensor (d) a motion sensor
19. 19.🔍 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)?
20. 20.Which job needs a motion sensor? (a) spot someone walking in (b) keep an incubator warm (c) stop a robot near walls (d) switch on with a clap
21. 21.⚙️ What is an actuator? (a) a battery (b) an output that acts (c) a program (d) a sensor
22. 22.🔍 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)?
23. 23.🔍 Which sensor would you use to make a parking alarm? (a) a rain sensor (b) a gas sensor (c) a distance sensor (d) a light sensor
24. 24.True or false: to water a dry plant, use a soil moisture sensor. (a) False (b) True
25. 25.Which job needs a servo motor? (a) spin a robot’s wheels (b) show a status light (c) open a gate to 90° (d) beep an alarm
26. 26.Which job needs a servo motor? (a) move water to plants (b) spin a robot’s wheels (c) turn to an exact angle (d) beep an alarm
27. 27.Which job needs a motor? (a) spin a robot’s wheels (b) open a gate to 90° (c) show the temperature (d) turn to an exact angle
28. 28.True or false: to switch on lamps at dusk, use a soil moisture sensor. (a) False (b) True
29. 29.🔍 Which sensor would you use to stop a robot near walls? (a) a motion sensor (b) a light sensor (c) a temperature sensor (d) a distance sensor
30. 30.Which job needs an LED? (a) show the temperature (b) show a status light (c) turn to an exact angle (d) open a gate to 90°
31. 31.🔍 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)?
32. 32.🔍 A distance sensor sends a sound pulse and hears the echo 6 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
33. 33.🔍 A distance sensor sends a sound pulse and hears the echo 4 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
34. 34.Which job needs a rain sensor? (a) close a window in rain (b) start a fan when hot (c) spot someone walking in (d) water a dry plant
35. 35.🔍 Which sensor would you use to switch on with a clap? (a) a sound sensor (b) a rain sensor (c) a gas sensor (d) a temperature sensor
36. 36.🔍 Which sensor would you use to keep an incubator warm? (a) a gas sensor (b) a distance sensor (c) a temperature sensor (d) a motion sensor
37. 37.True or false: to switch on lamps at dusk, use a light sensor. (a) True (b) False
38. 38.True or false: to stop a robot near walls, use a light sensor. (a) True (b) False
39. 39.⚙️ Which actuator would you use to spin a robot’s wheels? (a) a pump (b) a motor (c) a servo motor (d) a buzzer
40. 40.True or false: to open blinds at sunrise, use a rain sensor. (a) True (b) False

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