Electronics Worksheet: Sensors and Actuators

Electronics lesson 26: Sensors and actuators · Set 33 · 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.🔍 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)?
2. 2.Which job needs a light sensor? (a) open blinds at sunrise (b) warn of a gas leak (c) water a dry plant (d) spot someone walking in
3. 3.🔍 Which sensor would you use to keep an incubator warm? (a) a sound sensor (b) a gas sensor (c) a temperature sensor (d) a motion sensor
4. 4.⚙️ Which actuator would you use to beep an alarm? (a) a motor (b) a buzzer (c) a display (d) a pump
5. 5.🔍 An object is 289 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
6. 6.Which job needs a light sensor? (a) keep an incubator warm (b) switch on lamps at dusk (c) make a parking alarm (d) start a fan when hot
7. 7.Which job needs a rain sensor? (a) make a parking alarm (b) close a window in rain (c) open blinds at sunrise (d) spot someone walking in
8. 8.⚙️ Which actuator would you use to turn to an exact angle? (a) a pump (b) an LED (c) a servo motor (d) a motor
9. 9.⚙️ Which actuator would you use to show the temperature? (a) a pump (b) a display (c) a servo motor (d) an LED
10. 10.Which job needs a soil moisture sensor? (a) close a window in rain (b) make a parking alarm (c) start a fan when hot (d) water a dry plant
11. 11.⚙️ What is an actuator? (a) a program (b) a battery (c) an output that acts (d) a sensor
12. 12.Which job needs a display? (a) show the temperature (b) show a status light (c) turn to an exact angle (d) beep an alarm
13. 13.⚙️ Which actuator would you use to open a gate to 90°? (a) a motor (b) a pump (c) a servo motor (d) a display
14. 14.⚙️ Which actuator would you use to show a status light? (a) a display (b) an LED (c) a servo motor (d) a pump
15. 15.⚙️ Which actuator would you use to spin a robot’s wheels? (a) a servo motor (b) an LED (c) a display (d) a motor
16. 16.Which job needs a gas sensor? (a) switch on with a clap (b) warn of a gas leak (c) spot someone walking in (d) water a dry plant
17. 17.🔍 Which sensor would you use to close a window in rain? (a) a rain sensor (b) a motion sensor (c) a temperature sensor (d) a distance sensor
18. 18.True or false: to switch on with a clap, use a sound sensor. (a) False (b) True
19. 19.🔍 An object is 272 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
20. 20.🔍 For a microcontroller, is a sensor an input or an output? (a) an input (b) an output (c) a power source (d) a fuse
21. 21.Which job needs a sound sensor? (a) close a window in rain (b) measure classroom noise (c) switch on lamps at dusk (d) stop a robot near walls
22. 22.🔍 Which sensor would you use to open blinds at sunrise? (a) a rain sensor (b) a motion sensor (c) a light sensor (d) a distance sensor
23. 23.🔍 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)?
24. 24.Which job needs an LED? (a) spin a robot’s wheels (b) show a status light (c) beep an alarm (d) turn to an exact angle
25. 25.True or false: to close a window in rain, use a rain sensor. (a) False (b) True
26. 26.🔍 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)?
27. 27.🔍 Which sensor would you use to switch on lamps at dusk? (a) a temperature sensor (b) a soil moisture sensor (c) a light sensor (d) a sound sensor
28. 28.🔍 Which sensor would you use to water a dry plant? (a) a rain sensor (b) a motion sensor (c) a soil moisture sensor (d) a light sensor
29. 29.Which job needs a temperature sensor? (a) switch on lamps at dusk (b) close a window in rain (c) spot someone walking in (d) start a fan when hot
30. 30.🔍 An object is 119 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
31. 31.🔍 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)?
32. 32.🔍 A distance sensor sends a sound pulse and hears the echo 15 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
33. 33.Which job needs a servo motor? (a) beep an alarm (b) show a status light (c) turn to an exact angle (d) spin a robot’s wheels
34. 34.🔍 Which sensor would you use to warn of a gas leak? (a) a gas sensor (b) a rain sensor (c) a distance sensor (d) a sound sensor
35. 35.True or false: to switch on lamps at dusk, use a rain sensor. (a) False (b) True
36. 36.True or false: to measure classroom noise, use a sound sensor. (a) False (b) True
37. 37.True or false: to make a parking alarm, use a gas sensor. (a) True (b) False
38. 38.Which job needs a buzzer? (a) turn to an exact angle (b) show the temperature (c) open a gate to 90° (d) beep an alarm
39. 39.🔍 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?
40. 40.True or false: to start a fan when hot, use a gas sensor. (a) False (b) True

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