Electronics Worksheet: Sensors and Actuators

Electronics lesson 26: Sensors and actuators · Set 164 · 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 measure classroom noise? (a) a distance sensor (b) a sound sensor (c) a rain sensor (d) a motion sensor
2. 2.🔍 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?
3. 3.🔍 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)?
4. 4.Which job needs a rain sensor? (a) start a fan when hot (b) keep an incubator warm (c) close a window in rain (d) measure classroom noise
5. 5.Which job needs a light sensor? (a) close a window in rain (b) keep an incubator warm (c) spot someone walking in (d) switch on lamps at dusk
6. 6.Which job needs a servo motor? (a) beep an alarm (b) spin a robot’s wheels (c) open a gate to 90° (d) show the temperature
7. 7.⚙️ Which actuator would you use to show the temperature? (a) a display (b) a servo motor (c) a motor (d) a pump
8. 8.Which job needs a temperature sensor? (a) close a window in rain (b) switch on with a clap (c) start a fan when hot (d) water a dry plant
9. 9.🔍 For a microcontroller, is a sensor an input or an output? (a) an output (b) a power source (c) a fuse (d) an input
10. 10.⚙️ Which actuator would you use to open a gate to 90°? (a) a motor (b) a pump (c) a buzzer (d) a servo motor
11. 11.True or false: to switch on with a clap, use a soil moisture sensor. (a) False (b) True
12. 12.True or false: to open blinds at sunrise, use a light sensor. (a) False (b) True
13. 13.Which job needs a display? (a) spin a robot’s wheels (b) show a status light (c) move water to plants (d) show the temperature
14. 14.🔍 Which sensor would you use to make a parking alarm? (a) a motion sensor (b) a soil moisture sensor (c) a sound sensor (d) a distance sensor
15. 15.⚙️ Which actuator would you use to beep an alarm? (a) a buzzer (b) a motor (c) a display (d) an LED
16. 16.⚙️ What is an actuator? (a) a battery (b) a program (c) an output that acts (d) a sensor
17. 17.🔍 Which sensor would you use to water a dry plant? (a) a sound sensor (b) a temperature sensor (c) a soil moisture sensor (d) a distance sensor
18. 18.🔍 A distance sensor sends a sound pulse and hears the echo 14 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
19. 19.🔍 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)?
20. 20.🔍 Which sensor would you use to warn of a gas leak? (a) a rain sensor (b) a soil moisture sensor (c) a gas sensor (d) a distance sensor
21. 21.True or false: to warn of a gas leak, use a gas sensor. (a) False (b) True
22. 22.🔍 Which sensor would you use to switch on lamps at dusk? (a) a distance sensor (b) a gas sensor (c) a temperature sensor (d) a light sensor
23. 23.⚙️ Which actuator would you use to show a status light? (a) a servo motor (b) an LED (c) a motor (d) a display
24. 24.Which job needs a motor? (a) beep an alarm (b) show a status light (c) spin a robot’s wheels (d) open a gate to 90°
25. 25.🔍 Which sensor would you use to switch on with a clap? (a) a gas sensor (b) a sound sensor (c) a rain sensor (d) a temperature sensor
26. 26.🔍 Which sensor would you use to stop a robot near walls? (a) a distance sensor (b) a motion sensor (c) a light sensor (d) a gas sensor
27. 27.True or false: to switch on with a clap, use a sound sensor. (a) True (b) False
28. 28.🔍 A distance sensor sends a sound pulse and hears the echo 20 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
29. 29.Which job needs a temperature sensor? (a) make a parking alarm (b) switch on lamps at dusk (c) stop a robot near walls (d) keep an incubator warm
30. 30.🔍 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?
31. 31.True or false: to spot someone walking in, use a motion sensor. (a) False (b) True
32. 32.Which job needs a pump? (a) open a gate to 90° (b) move water to plants (c) spin a robot’s wheels (d) show a status light
33. 33.🔍 Which sensor would you use to start a fan when hot? (a) a motion sensor (b) a rain sensor (c) a temperature sensor (d) a sound sensor
34. 34.⚙️ Which actuator would you use to spin a robot’s wheels? (a) a servo motor (b) a display (c) a pump (d) a motor
35. 35.🔍 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)?
36. 36.⚙️ Which actuator would you use to move water to plants? (a) a buzzer (b) a pump (c) an LED (d) a servo motor
37. 37.🔍 Which sensor would you use to open blinds at sunrise? (a) a motion sensor (b) a distance sensor (c) a sound sensor (d) a light sensor
38. 38.Which job needs a sound sensor? (a) switch on with a clap (b) switch on lamps at dusk (c) warn of a gas leak (d) keep an incubator warm
39. 39.Which job needs a servo motor? (a) turn to an exact angle (b) move water to plants (c) spin a robot’s wheels (d) show the temperature
40. 40.True or false: to measure classroom noise, use a temperature sensor. (a) False (b) True

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