Electronics Worksheet: Sensors and Actuators

Electronics lesson 26: Sensors and actuators · Set 128 · 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 motor? (a) open a gate to 90° (b) move water to plants (c) spin a robot’s wheels (d) show the temperature
2. 2.🔍 For a microcontroller, is a sensor an input or an output? (a) an input (b) a fuse (c) an output (d) a power source
3. 3.⚙️ What is an actuator? (a) a program (b) a battery (c) a sensor (d) an output that acts
4. 4.🔍 Which sensor would you use to make a parking alarm? (a) a distance sensor (b) a soil moisture sensor (c) a motion sensor (d) a sound sensor
5. 5.Which job needs a temperature sensor? (a) switch on with a clap (b) switch on lamps at dusk (c) measure classroom noise (d) start a fan when hot
6. 6.🔍 Which sensor would you use to spot someone walking in? (a) a sound sensor (b) a soil moisture sensor (c) a light sensor (d) a motion sensor
7. 7.Which job needs an LED? (a) move water to plants (b) show a status light (c) open a gate to 90° (d) show the temperature
8. 8.🔍 Which sensor would you use to open blinds at sunrise? (a) a motion sensor (b) a temperature sensor (c) a rain sensor (d) a light sensor
9. 9.Which job needs a motion sensor? (a) measure classroom noise (b) open blinds at sunrise (c) spot someone walking in (d) start a fan when hot
10. 10.⚙️ Which actuator would you use to move water to plants? (a) a pump (b) an LED (c) a motor (d) a buzzer
11. 11.Which job needs a light sensor? (a) close a window in rain (b) make a parking alarm (c) switch on lamps at dusk (d) spot someone walking in
12. 12.⚙️ Which actuator would you use to turn to an exact angle? (a) a buzzer (b) a motor (c) a servo motor (d) a display
13. 13.Which job needs a temperature sensor? (a) water a dry plant (b) make a parking alarm (c) spot someone walking in (d) keep an incubator warm
14. 14.True or false: to switch on lamps at dusk, use a distance sensor. (a) True (b) False
15. 15.True or false: to make a parking alarm, use a motion sensor. (a) True (b) False
16. 16.True or false: to keep an incubator warm, use a temperature sensor. (a) False (b) True
17. 17.🔍 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)?
18. 18.🔍 Which sensor would you use to switch on with a clap? (a) a motion sensor (b) a temperature sensor (c) a rain sensor (d) a sound sensor
19. 19.Which job needs a pump? (a) move water to plants (b) open a gate to 90° (c) show a status light (d) spin a robot’s wheels
20. 20.True or false: to spot someone walking in, use a motion sensor. (a) False (b) True
21. 21.Which job needs a servo motor? (a) open a gate to 90° (b) show the temperature (c) move water to plants (d) spin a robot’s wheels
22. 22.⚙️ Which actuator would you use to spin a robot’s wheels? (a) a motor (b) a pump (c) a buzzer (d) an LED
23. 23.🔍 Which sensor would you use to measure classroom noise? (a) a sound sensor (b) a motion sensor (c) a soil moisture sensor (d) a rain sensor
24. 24.⚙️ Which actuator would you use to beep an alarm? (a) a motor (b) a display (c) a servo motor (d) a buzzer
25. 25.Which job needs a gas sensor? (a) spot someone walking in (b) warn of a gas leak (c) measure classroom noise (d) start a fan when hot
26. 26.🔍 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)?
27. 27.Which job needs a display? (a) show a status light (b) show the temperature (c) beep an alarm (d) move water to plants
28. 28.Which job needs a rain sensor? (a) warn of a gas leak (b) keep an incubator warm (c) open blinds at sunrise (d) close a window in rain
29. 29.⚙️ Which actuator would you use to open a gate to 90°? (a) a pump (b) a motor (c) a servo motor (d) a buzzer
30. 30.Which job needs a soil moisture sensor? (a) open blinds at sunrise (b) water a dry plant (c) make a parking alarm (d) warn of a gas leak
31. 31.🔍 Which sensor would you use to water a dry plant? (a) a distance sensor (b) a motion sensor (c) a light sensor (d) a soil moisture sensor
32. 32.True or false: to keep an incubator warm, use a light sensor. (a) True (b) False
33. 33.True or false: to open blinds at sunrise, use a light sensor. (a) False (b) True
34. 34.🔍 An object is 34 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
35. 35.🔍 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)?
36. 36.Which job needs a servo motor? (a) show the temperature (b) show a status light (c) spin a robot’s wheels (d) turn to an exact angle
37. 37.Which job needs a sound sensor? (a) water a dry plant (b) keep an incubator warm (c) measure classroom noise (d) make a parking alarm
38. 38.🔍 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?
39. 39.Which job needs a sound sensor? (a) close a window in rain (b) open blinds at sunrise (c) switch on with a clap (d) make a parking alarm
40. 40.🔍 Which sensor would you use to switch on lamps at dusk? (a) a rain sensor (b) a distance sensor (c) a light sensor (d) a temperature sensor

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