Electronics Worksheet: Sensors and Actuators

Electronics lesson 26: Sensors and actuators · Set 125 · 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 an LED? (a) spin a robot’s wheels (b) turn to an exact angle (c) show a status light (d) open a gate to 90°
2. 2.🔍 Which sensor would you use to start a fan when hot? (a) a gas sensor (b) a distance sensor (c) a soil moisture sensor (d) a temperature sensor
3. 3.🔍 Which sensor would you use to close a window in rain? (a) a rain sensor (b) a distance sensor (c) a gas sensor (d) a soil moisture sensor
4. 4.🔍 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)?
5. 5.Which job needs a servo motor? (a) move water to plants (b) show a status light (c) beep an alarm (d) turn to an exact angle
6. 6.🔍 Which sensor would you use to measure classroom noise? (a) a sound sensor (b) a temperature sensor (c) a distance sensor (d) a soil moisture sensor
7. 7.Which job needs a sound sensor? (a) water a dry plant (b) keep an incubator warm (c) stop a robot near walls (d) measure classroom noise
8. 8.⚙️ Which actuator would you use to spin a robot’s wheels? (a) a display (b) a motor (c) an LED (d) a pump
9. 9.Which job needs a motor? (a) show a status light (b) move water to plants (c) turn to an exact angle (d) spin a robot’s wheels
10. 10.⚙️ What is an actuator? (a) a program (b) an output that acts (c) a sensor (d) a battery
11. 11.⚙️ Which actuator would you use to turn to an exact angle? (a) a servo motor (b) an LED (c) a display (d) a motor
12. 12.⚙️ Which actuator would you use to show the temperature? (a) a buzzer (b) a motor (c) a pump (d) a display
13. 13.True or false: to spot someone walking in, use a rain sensor. (a) True (b) False
14. 14.🔍 For a microcontroller, is a sensor an input or an output? (a) an output (b) a fuse (c) an input (d) a power source
15. 15.🔍 An object is 323 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
16. 16.Which job needs a distance sensor? (a) close a window in rain (b) spot someone walking in (c) stop a robot near walls (d) switch on with a clap
17. 17.🔍 Which sensor would you use to warn of a gas leak? (a) a motion sensor (b) a soil moisture sensor (c) a temperature sensor (d) a gas sensor
18. 18.⚙️ Which actuator would you use to beep an alarm? (a) a motor (b) an LED (c) a pump (d) a buzzer
19. 19.Which job needs a rain sensor? (a) switch on with a clap (b) measure classroom noise (c) close a window in rain (d) water a dry plant
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.Which job needs a gas sensor? (a) warn of a gas leak (b) open blinds at sunrise (c) keep an incubator warm (d) spot someone walking in
22. 22.⚙️ Which actuator would you use to show a status light? (a) a buzzer (b) an LED (c) a display (d) a servo motor
23. 23.True or false: to warn of a gas leak, use a gas sensor. (a) True (b) False
24. 24.🔍 Which sensor would you use to spot someone walking in? (a) a soil moisture sensor (b) a motion sensor (c) a distance sensor (d) a light sensor
25. 25.Which job needs a distance sensor? (a) close a window in rain (b) open blinds at sunrise (c) switch on lamps at dusk (d) make a parking alarm
26. 26.True or false: to keep an incubator warm, use a temperature sensor. (a) True (b) False
27. 27.🔍 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)?
28. 28.🔍 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)?
29. 29.🔍 A distance sensor sends a sound pulse and hears the echo 7 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
30. 30.True or false: to start a fan when hot, use a gas sensor. (a) True (b) False
31. 31.🔍 A distance sensor sends a sound pulse and hears the echo 18 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
32. 32.True or false: to measure classroom noise, use a gas sensor. (a) True (b) False
33. 33.🔍 An object is 102 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
34. 34.🔍 Which sensor would you use to switch on with a clap? (a) a temperature sensor (b) a rain sensor (c) a soil moisture sensor (d) a sound sensor
35. 35.Which job needs a motion sensor? (a) switch on lamps at dusk (b) spot someone walking in (c) stop a robot near walls (d) switch on with a clap
36. 36.🔍 An object is 170 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
37. 37.Which job needs a temperature sensor? (a) warn of a gas leak (b) start a fan when hot (c) make a parking alarm (d) stop a robot near walls
38. 38.Which job needs a buzzer? (a) show the temperature (b) open a gate to 90° (c) turn to an exact angle (d) beep an alarm
39. 39.Which job needs a soil moisture sensor? (a) make a parking alarm (b) stop a robot near walls (c) water a dry plant (d) switch on with a clap
40. 40.🔍 Which sensor would you use to stop a robot near walls? (a) a soil moisture sensor (b) a gas sensor (c) a distance sensor (d) a sound sensor

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