Electronics Worksheet: Sensors and Actuators

Electronics lesson 26: Sensors and actuators · Set 129 · 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 job needs a buzzer? (a) open a gate to 90° (b) turn to an exact angle (c) beep an alarm (d) spin a robot’s wheels
2. 2.Which job needs a servo motor? (a) beep an alarm (b) show the temperature (c) move water to plants (d) turn to an exact angle
3. 3.Which job needs a motor? (a) move water to plants (b) show the temperature (c) turn to an exact angle (d) spin a robot’s wheels
4. 4.Which job needs a sound sensor? (a) open blinds at sunrise (b) switch on lamps at dusk (c) make a parking alarm (d) measure classroom noise
5. 5.🔍 An object is 255 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
6. 6.⚙️ What is an actuator? (a) a sensor (b) a program (c) a battery (d) an output that acts
7. 7.Which job needs a temperature sensor? (a) warn of a gas leak (b) start a fan when hot (c) spot someone walking in (d) switch on with a clap
8. 8.True or false: to stop a robot near walls, use a distance sensor. (a) True (b) False
9. 9.🔍 Which sensor would you use to keep an incubator warm? (a) a temperature sensor (b) a light sensor (c) a distance sensor (d) a gas sensor
10. 10.🔍 Which sensor would you use to warn of a gas leak? (a) a motion sensor (b) a rain sensor (c) a temperature sensor (d) a gas sensor
11. 11.True or false: to switch on with a clap, use a sound sensor. (a) False (b) True
12. 12.Which job needs a soil moisture sensor? (a) close a window in rain (b) warn of a gas leak (c) water a dry plant (d) switch on with a clap
13. 13.🔍 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?
14. 14.⚙️ Which actuator would you use to open a gate to 90°? (a) a pump (b) a display (c) a buzzer (d) a servo motor
15. 15.True or false: to water a dry plant, use a distance sensor. (a) True (b) False
16. 16.Which job needs a display? (a) show a status light (b) open a gate to 90° (c) spin a robot’s wheels (d) show the temperature
17. 17.True or false: to stop a robot near walls, use a temperature sensor. (a) True (b) False
18. 18.🔍 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?
19. 19.⚙️ Which actuator would you use to show the temperature? (a) a buzzer (b) a motor (c) a pump (d) a display
20. 20.🔍 For a microcontroller, is a sensor an input or an output? (a) an input (b) an output (c) a fuse (d) a power source
21. 21.True or false: to spot someone walking in, use a soil moisture sensor. (a) False (b) True
22. 22.Which job needs a pump? (a) spin a robot’s wheels (b) move water to plants (c) turn to an exact angle (d) show a status light
23. 23.🔍 Which sensor would you use to stop a robot near walls? (a) a light sensor (b) a rain sensor (c) a motion sensor (d) a distance sensor
24. 24.True or false: to measure classroom noise, use a soil moisture sensor. (a) True (b) False
25. 25.Which job needs a light sensor? (a) measure classroom noise (b) stop a robot near walls (c) start a fan when hot (d) switch on lamps at dusk
26. 26.🔍 Which sensor would you use to start a fan when hot? (a) a sound sensor (b) a soil moisture sensor (c) a gas sensor (d) a temperature sensor
27. 27.🔍 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)?
28. 28.Which job needs a gas sensor? (a) warn of a gas leak (b) water a dry plant (c) start a fan when hot (d) switch on with a clap
29. 29.⚙️ Which actuator would you use to spin a robot’s wheels? (a) a pump (b) a servo motor (c) a motor (d) an LED
30. 30.⚙️ Which actuator would you use to turn to an exact angle? (a) an LED (b) a motor (c) a buzzer (d) a servo motor
31. 31.Which job needs a distance sensor? (a) switch on with a clap (b) measure classroom noise (c) stop a robot near walls (d) start a fan when hot
32. 32.⚙️ Which actuator would you use to move water to plants? (a) a motor (b) an LED (c) a servo motor (d) a pump
33. 33.⚙️ Which actuator would you use to beep an alarm? (a) a buzzer (b) an LED (c) a display (d) a servo motor
34. 34.Which job needs a rain sensor? (a) switch on lamps at dusk (b) close a window in rain (c) measure classroom noise (d) spot someone walking in
35. 35.True or false: to stop a robot near walls, use a gas sensor. (a) True (b) False
36. 36.🔍 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?
37. 37.True or false: to measure classroom noise, use a motion sensor. (a) False (b) True
38. 38.True or false: to stop a robot near walls, use a rain sensor. (a) False (b) True
39. 39.🔍 Which sensor would you use to water a dry plant? (a) a soil moisture sensor (b) a motion sensor (c) a temperature sensor (d) a light sensor
40. 40.Which job needs an LED? (a) show the temperature (b) move water to plants (c) show a status light (d) turn to an exact angle

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