Electronics Worksheet: Sensors and Actuators

Electronics lesson 26: Sensors and actuators · Set 204 · 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 open blinds at sunrise? (a) a distance sensor (b) a sound sensor (c) a rain sensor (d) a light sensor
2. 2.⚙️ Which actuator would you use to show the temperature? (a) an LED (b) a buzzer (c) a display (d) a motor
3. 3.Which job needs a light sensor? (a) make a parking alarm (b) open blinds at sunrise (c) stop a robot near walls (d) spot someone walking in
4. 4.True or false: to water a dry plant, use a soil moisture sensor. (a) True (b) False
5. 5.🔍 For a microcontroller, is a sensor an input or an output? (a) an output (b) a power source (c) an input (d) a fuse
6. 6.True or false: to start a fan when hot, use a temperature sensor. (a) True (b) False
7. 7.Which job needs a pump? (a) move water to plants (b) spin a robot’s wheels (c) turn to an exact angle (d) show a status light
8. 8.🔍 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)?
9. 9.Which job needs a rain sensor? (a) close a window in rain (b) switch on lamps at dusk (c) measure classroom noise (d) keep an incubator warm
10. 10.Which job needs a motion sensor? (a) keep an incubator warm (b) spot someone walking in (c) stop a robot near walls (d) switch on lamps at dusk
11. 11.🔍 A distance sensor sends a sound pulse and hears the echo 11 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
12. 12.🔍 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?
13. 13.Which job needs a buzzer? (a) show a status light (b) show the temperature (c) turn to an exact angle (d) beep an alarm
14. 14.🔍 A distance sensor sends a sound pulse and hears the echo 15 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
15. 15.⚙️ Which actuator would you use to turn to an exact angle? (a) a display (b) an LED (c) a servo motor (d) a buzzer
16. 16.🔍 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?
17. 17.🔍 Which sensor would you use to warn of a gas leak? (a) a gas sensor (b) a sound sensor (c) a rain sensor (d) a temperature sensor
18. 18.Which job needs a temperature sensor? (a) start a fan when hot (b) warn of a gas leak (c) make a parking alarm (d) switch on lamps at dusk
19. 19.🔍 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?
20. 20.🔍 An object is 238 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
21. 21.Which job needs a sound sensor? (a) stop a robot near walls (b) warn of a gas leak (c) keep an incubator warm (d) measure classroom noise
22. 22.⚙️ What is an actuator? (a) a battery (b) a sensor (c) a program (d) an output that acts
23. 23.Which job needs a gas sensor? (a) keep an incubator warm (b) warn of a gas leak (c) switch on lamps at dusk (d) make a parking alarm
24. 24.Which job needs a soil moisture sensor? (a) start a fan when hot (b) switch on lamps at dusk (c) water a dry plant (d) keep an incubator warm
25. 25.⚙️ Which actuator would you use to move water to plants? (a) a display (b) a pump (c) an LED (d) a motor
26. 26.True or false: to close a window in rain, use a distance sensor. (a) False (b) True
27. 27.🔍 Which sensor would you use to keep an incubator warm? (a) a temperature sensor (b) a rain sensor (c) a motion sensor (d) a light sensor
28. 28.⚙️ Which actuator would you use to open a gate to 90°? (a) a servo motor (b) a motor (c) an LED (d) a pump
29. 29.⚙️ Which actuator would you use to spin a robot’s wheels? (a) a buzzer (b) a servo motor (c) a motor (d) an LED
30. 30.True or false: to switch on with a clap, use a gas sensor. (a) False (b) True
31. 31.🔍 Which sensor would you use to stop a robot near walls? (a) a distance sensor (b) a motion sensor (c) a temperature sensor (d) a gas sensor
32. 32.🔍 Which sensor would you use to start a fan when hot? (a) a soil moisture sensor (b) a distance sensor (c) a temperature sensor (d) a rain sensor
33. 33.Which job needs a light sensor? (a) measure classroom noise (b) spot someone walking in (c) warn of a gas leak (d) switch on lamps at dusk
34. 34.True or false: to measure classroom noise, use a temperature sensor. (a) True (b) False
35. 35.True or false: to switch on lamps at dusk, use a light sensor. (a) False (b) True
36. 36.🔍 Which sensor would you use to make a parking alarm? (a) a light sensor (b) a motion sensor (c) a distance sensor (d) a gas sensor
37. 37.Which job needs a display? (a) show the temperature (b) beep an alarm (c) open a gate to 90° (d) spin a robot’s wheels
38. 38.🔍 Which sensor would you use to measure classroom noise? (a) a distance sensor (b) a sound sensor (c) a temperature sensor (d) a soil moisture sensor
39. 39.Which job needs an LED? (a) turn to an exact angle (b) move water to plants (c) beep an alarm (d) show a status light
40. 40.Which job needs a motor? (a) turn to an exact angle (b) show the temperature (c) spin a robot’s wheels (d) show a status light

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