Electronics Worksheet: Sensors and Actuators

Electronics lesson 26: Sensors and actuators · Set 32 · 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.⚙️ What is an actuator? (a) a sensor (b) a program (c) a battery (d) an output that acts
2. 2.True or false: to open blinds at sunrise, use a light sensor. (a) True (b) False
3. 3.🔍 Which sensor would you use to keep an incubator warm? (a) a sound sensor (b) a temperature sensor (c) a motion sensor (d) a gas sensor
4. 4.Which job needs a servo motor? (a) turn to an exact angle (b) beep an alarm (c) show a status light (d) spin a robot’s wheels
5. 5.Which job needs an LED? (a) show a status light (b) spin a robot’s wheels (c) open a gate to 90° (d) turn to an exact angle
6. 6.⚙️ Which actuator would you use to show the temperature? (a) a motor (b) an LED (c) a buzzer (d) a display
7. 7.🔍 A distance sensor sends a sound pulse and hears the echo 19 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
8. 8.🔍 Which sensor would you use to open blinds at sunrise? (a) a motion sensor (b) a gas sensor (c) a light sensor (d) a temperature sensor
9. 9.True or false: to make a parking alarm, use a rain sensor. (a) False (b) True
10. 10.True or false: to measure classroom noise, use a sound sensor. (a) True (b) False
11. 11.Which job needs a distance sensor? (a) water a dry plant (b) switch on with a clap (c) keep an incubator warm (d) make a parking alarm
12. 12.True or false: to open blinds at sunrise, use a distance sensor. (a) False (b) True
13. 13.⚙️ Which actuator would you use to turn to an exact angle? (a) an LED (b) a motor (c) a servo motor (d) a buzzer
14. 14.🔍 A distance sensor sends a sound pulse and hears the echo 3 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
15. 15.Which job needs a sound sensor? (a) switch on lamps at dusk (b) measure classroom noise (c) warn of a gas leak (d) open blinds at sunrise
16. 16.Which job needs a gas sensor? (a) close a window in rain (b) keep an incubator warm (c) switch on with a clap (d) warn of a gas leak
17. 17.True or false: to switch on with a clap, use a sound sensor. (a) False (b) True
18. 18.Which job needs a buzzer? (a) beep an alarm (b) open a gate to 90° (c) turn to an exact angle (d) spin a robot’s wheels
19. 19.True or false: to make a parking alarm, use a distance sensor. (a) True (b) False
20. 20.🔍 A distance sensor sends a sound pulse and hears the echo 6 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
21. 21.🔍 Which sensor would you use to close a window in rain? (a) a rain sensor (b) a gas sensor (c) a distance sensor (d) a sound sensor
22. 22.Which job needs a display? (a) beep an alarm (b) turn to an exact angle (c) show a status light (d) show the temperature
23. 23.🔍 For a microcontroller, is a sensor an input or an output? (a) a power source (b) a fuse (c) an output (d) an input
24. 24.True or false: to keep an incubator warm, use a rain sensor. (a) True (b) False
25. 25.True or false: to keep an incubator warm, use a temperature sensor. (a) False (b) True
26. 26.Which job needs a motion sensor? (a) switch on lamps at dusk (b) warn of a gas leak (c) spot someone walking in (d) start a fan when hot
27. 27.🔍 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?
28. 28.True or false: to switch on lamps at dusk, use a gas sensor. (a) False (b) True
29. 29.🔍 An object is 255 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 1 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
31. 31.True or false: to open blinds at sunrise, use a sound sensor. (a) True (b) False
32. 32.🔍 A distance sensor sends a sound pulse and hears the echo 12 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
33. 33.🔍 Which sensor would you use to measure classroom noise? (a) a motion sensor (b) a light sensor (c) a sound sensor (d) a soil moisture sensor
34. 34.True or false: to measure classroom noise, use a temperature sensor. (a) False (b) True
35. 35.⚙️ Which actuator would you use to beep an alarm? (a) a motor (b) a buzzer (c) a servo motor (d) a pump
36. 36.🔍 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)?
37. 37.⚙️ Which actuator would you use to spin a robot’s wheels? (a) a display (b) a buzzer (c) a motor (d) an LED
38. 38.Which job needs a motor? (a) show a status light (b) turn to an exact angle (c) spin a robot’s wheels (d) beep an alarm
39. 39.Which job needs a soil moisture sensor? (a) water a dry plant (b) spot someone walking in (c) open blinds at sunrise (d) switch on lamps at dusk
40. 40.🔍 An object is 187 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?

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