Electronics Worksheet: Sensors and Actuators

Electronics lesson 26: Sensors and actuators · Set 308 · 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 pump? (a) spin a robot’s wheels (b) move water to plants (c) show a status light (d) turn to an exact angle
2. 2.🔍 Which sensor would you use to close a window in rain? (a) a light sensor (b) a temperature sensor (c) a soil moisture sensor (d) a rain sensor
3. 3.⚙️ Which actuator would you use to show a status light? (a) an LED (b) a buzzer (c) a pump (d) a servo motor
4. 4.Which job needs a motor? (a) beep an alarm (b) spin a robot’s wheels (c) turn to an exact angle (d) show a status light
5. 5.⚙️ What is an actuator? (a) a battery (b) an output that acts (c) a program (d) a sensor
6. 6.Which job needs a distance sensor? (a) keep an incubator warm (b) start a fan when hot (c) warn of a gas leak (d) stop a robot near walls
7. 7.Which job needs a rain sensor? (a) measure classroom noise (b) switch on lamps at dusk (c) make a parking alarm (d) close a window in rain
8. 8.Which job needs a display? (a) show the temperature (b) turn to an exact angle (c) show a status light (d) spin a robot’s wheels
9. 9.Which job needs a buzzer? (a) open a gate to 90° (b) show a status light (c) beep an alarm (d) move water to plants
10. 10.🔍 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?
11. 11.🔍 Which sensor would you use to stop a robot near walls? (a) a soil moisture sensor (b) a distance sensor (c) a temperature sensor (d) a light sensor
12. 12.🔍 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)?
13. 13.True or false: to start a fan when hot, use a motion sensor. (a) False (b) True
14. 14.True or false: to measure classroom noise, use a sound sensor. (a) True (b) False
15. 15.🔍 For a microcontroller, is a sensor an input or an output? (a) an output (b) an input (c) a fuse (d) a power source
16. 16.True or false: to switch on with a clap, use a rain sensor. (a) False (b) True
17. 17.Which job needs an LED? (a) move water to plants (b) show a status light (c) beep an alarm (d) turn to an exact angle
18. 18.Which job needs a temperature sensor? (a) keep an incubator warm (b) switch on with a clap (c) warn of a gas leak (d) switch on lamps at dusk
19. 19.True or false: to switch on with a clap, use a sound sensor. (a) True (b) False
20. 20.🔍 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?
21. 21.True or false: to close a window in rain, use a temperature sensor. (a) True (b) False
22. 22.🔍 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)?
23. 23.Which job needs a motion sensor? (a) switch on lamps at dusk (b) spot someone walking in (c) keep an incubator warm (d) start a fan when hot
24. 24.⚙️ Which actuator would you use to turn to an exact angle? (a) a pump (b) a buzzer (c) a motor (d) a servo motor
25. 25.⚙️ Which actuator would you use to open a gate to 90°? (a) an LED (b) a servo motor (c) a buzzer (d) a motor
26. 26.⚙️ Which actuator would you use to spin a robot’s wheels? (a) a buzzer (b) an LED (c) a motor (d) a servo motor
27. 27.🔍 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)?
28. 28.⚙️ Which actuator would you use to beep an alarm? (a) a buzzer (b) an LED (c) a motor (d) a pump
29. 29.🔍 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?
30. 30.🔍 A distance sensor sends a sound pulse and hears the echo 10 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
31. 31.Which job needs a temperature sensor? (a) warn of a gas leak (b) make a parking alarm (c) start a fan when hot (d) open blinds at sunrise
32. 32.True or false: to start a fan when hot, use a gas sensor. (a) True (b) False
33. 33.🔍 Which sensor would you use to spot someone walking in? (a) a motion sensor (b) a light sensor (c) a soil moisture sensor (d) a gas sensor
34. 34.Which job needs a gas sensor? (a) switch on with a clap (b) water a dry plant (c) switch on lamps at dusk (d) warn of a gas leak
35. 35.Which job needs a light sensor? (a) spot someone walking in (b) start a fan when hot (c) switch on with a clap (d) switch on lamps at dusk
36. 36.True or false: to warn of a gas leak, use a temperature sensor. (a) False (b) True
37. 37.🔍 Which sensor would you use to make a parking alarm? (a) a light sensor (b) a motion sensor (c) a distance sensor (d) a temperature sensor
38. 38.Which job needs a light sensor? (a) keep an incubator warm (b) water a dry plant (c) switch on with a clap (d) open blinds at sunrise
39. 39.Which job needs a distance sensor? (a) switch on lamps at dusk (b) make a parking alarm (c) warn of a gas leak (d) open blinds at sunrise
40. 40.True or false: to measure classroom noise, use a soil moisture sensor. (a) True (b) False

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