Electronics Worksheet: Sensors and Actuators

Electronics lesson 26: Sensors and actuators · Set 186 · 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 gas sensor? (a) switch on lamps at dusk (b) switch on with a clap (c) warn of a gas leak (d) keep an incubator warm
2. 2.🔍 Which sensor would you use to start a fan when hot? (a) a light sensor (b) a gas sensor (c) a temperature sensor (d) a rain sensor
3. 3.True or false: to spot someone walking in, use a temperature sensor. (a) True (b) False
4. 4.Which job needs a sound sensor? (a) stop a robot near walls (b) switch on lamps at dusk (c) open blinds at sunrise (d) measure classroom noise
5. 5.Which job needs a soil moisture sensor? (a) spot someone walking in (b) open blinds at sunrise (c) start a fan when hot (d) water a dry plant
6. 6.⚙️ What is an actuator? (a) a battery (b) a sensor (c) a program (d) an output that acts
7. 7.Which job needs a display? (a) show a status light (b) move water to plants (c) show the temperature (d) beep an alarm
8. 8.⚙️ Which actuator would you use to move water to plants? (a) a display (b) a pump (c) a buzzer (d) a servo motor
9. 9.True or false: to close a window in rain, use a rain sensor. (a) False (b) True
10. 10.🔍 Which sensor would you use to stop a robot near walls? (a) a temperature sensor (b) a sound sensor (c) a light sensor (d) a distance sensor
11. 11.🔍 Which sensor would you use to switch on lamps at dusk? (a) a sound sensor (b) a light sensor (c) a motion sensor (d) a distance sensor
12. 12.Which job needs a rain sensor? (a) close a window in rain (b) start a fan when hot (c) warn of a gas leak (d) make a parking alarm
13. 13.Which job needs a light sensor? (a) start a fan when hot (b) measure classroom noise (c) switch on with a clap (d) switch on lamps at dusk
14. 14.🔍 Which sensor would you use to make a parking alarm? (a) a soil moisture sensor (b) a light sensor (c) a distance sensor (d) a gas sensor
15. 15.🔍 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)?
16. 16.🔍 For a microcontroller, is a sensor an input or an output? (a) a power source (b) an output (c) an input (d) a fuse
17. 17.True or false: to warn of a gas leak, use a gas sensor. (a) False (b) True
18. 18.⚙️ Which actuator would you use to open a gate to 90°? (a) a display (b) a servo motor (c) a motor (d) a buzzer
19. 19.🔍 Which sensor would you use to open blinds at sunrise? (a) a rain sensor (b) a soil moisture sensor (c) a gas sensor (d) a light sensor
20. 20.True or false: to start a fan when hot, use a light sensor. (a) True (b) False
21. 21.🔍 An object is 85 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
22. 22.Which job needs a temperature sensor? (a) switch on lamps at dusk (b) keep an incubator warm (c) close a window in rain (d) warn of a gas leak
23. 23.True or false: to stop a robot near walls, use a light sensor. (a) False (b) True
24. 24.Which job needs a sound sensor? (a) switch on with a clap (b) make a parking alarm (c) switch on lamps at dusk (d) warn of a gas leak
25. 25.Which job needs a servo motor? (a) turn to an exact angle (b) show a status light (c) move water to plants (d) show the temperature
26. 26.True or false: to make a parking alarm, use a distance sensor. (a) True (b) False
27. 27.🔍 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)?
28. 28.🔍 Which sensor would you use to switch on with a clap? (a) a temperature sensor (b) a distance sensor (c) a light sensor (d) a sound sensor
29. 29.⚙️ Which actuator would you use to turn to an exact angle? (a) a display (b) a motor (c) a servo motor (d) a buzzer
30. 30.Which job needs a pump? (a) spin a robot’s wheels (b) beep an alarm (c) show the temperature (d) move water to plants
31. 31.⚙️ Which actuator would you use to spin a robot’s wheels? (a) a motor (b) a pump (c) a display (d) a servo motor
32. 32.⚙️ Which actuator would you use to beep an alarm? (a) a servo motor (b) a display (c) a buzzer (d) a pump
33. 33.🔍 Which sensor would you use to keep an incubator warm? (a) a motion sensor (b) a light sensor (c) a temperature sensor (d) a soil moisture sensor
34. 34.🔍 An object is 136 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
35. 35.Which job needs a distance sensor? (a) make a parking alarm (b) switch on lamps at dusk (c) measure classroom noise (d) close a window in rain
36. 36.⚙️ Which actuator would you use to show a status light? (a) an LED (b) a motor (c) a buzzer (d) a servo motor
37. 37.Which job needs a buzzer? (a) open a gate to 90° (b) beep an alarm (c) move water to plants (d) turn to an exact angle
38. 38.Which job needs a distance sensor? (a) start a fan when hot (b) stop a robot near walls (c) water a dry plant (d) spot someone walking in
39. 39.True or false: to switch on lamps at dusk, use a rain sensor. (a) False (b) True
40. 40.True or false: to measure classroom noise, use a soil moisture sensor. (a) False (b) True

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