Electronics Worksheet: Sensors and Actuators

Electronics lesson 26: Sensors and actuators · Set 261 · 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.🔍 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?
2. 2.🔍 A distance sensor sends a sound pulse and hears the echo 13 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
3. 3.True or false: to warn of a gas leak, use a sound sensor. (a) True (b) False
4. 4.🔍 An object is 340 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
5. 5.🔍 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)?
6. 6.Which job needs a display? (a) spin a robot’s wheels (b) show a status light (c) open a gate to 90° (d) show the temperature
7. 7.🔍 For a microcontroller, is a sensor an input or an output? (a) a fuse (b) a power source (c) an output (d) an input
8. 8.⚙️ Which actuator would you use to move water to plants? (a) a pump (b) an LED (c) a servo motor (d) a display
9. 9.Which job needs a motion sensor? (a) keep an incubator warm (b) water a dry plant (c) spot someone walking in (d) switch on with a clap
10. 10.True or false: to keep an incubator warm, use a temperature sensor. (a) False (b) True
11. 11.⚙️ What is an actuator? (a) a program (b) an output that acts (c) a battery (d) a sensor
12. 12.True or false: to spot someone walking in, use a light sensor. (a) False (b) True
13. 13.⚙️ Which actuator would you use to beep an alarm? (a) a buzzer (b) a servo motor (c) an LED (d) a pump
14. 14.⚙️ Which actuator would you use to turn to an exact angle? (a) a motor (b) a servo motor (c) a buzzer (d) a display
15. 15.Which job needs a gas sensor? (a) stop a robot near walls (b) close a window in rain (c) switch on lamps at dusk (d) warn of a gas leak
16. 16.🔍 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)?
17. 17.True or false: to switch on with a clap, use a soil moisture sensor. (a) False (b) True
18. 18.🔍 Which sensor would you use to make a parking alarm? (a) a distance sensor (b) a temperature sensor (c) a rain sensor (d) a light sensor
19. 19.True or false: to close a window in rain, use a rain sensor. (a) True (b) False
20. 20.⚙️ Which actuator would you use to open a gate to 90°? (a) a display (b) an LED (c) a servo motor (d) a motor
21. 21.Which job needs a distance sensor? (a) switch on with a clap (b) make a parking alarm (c) measure classroom noise (d) warn of a gas leak
22. 22.Which job needs a temperature sensor? (a) switch on with a clap (b) measure classroom noise (c) start a fan when hot (d) stop a robot near walls
23. 23.⚙️ Which actuator would you use to show a status light? (a) a servo motor (b) a motor (c) a buzzer (d) an LED
24. 24.Which job needs a rain sensor? (a) keep an incubator warm (b) spot someone walking in (c) switch on lamps at dusk (d) close a window in rain
25. 25.🔍 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?
26. 26.True or false: to switch on lamps at dusk, use a soil moisture sensor. (a) True (b) False
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 distance sensor
28. 28.True or false: to stop a robot near walls, use a distance sensor. (a) True (b) False
29. 29.🔍 Which sensor would you use to stop a robot near walls? (a) a rain sensor (b) a motion sensor (c) a distance sensor (d) a temperature sensor
30. 30.True or false: to spot someone walking in, use a motion sensor. (a) False (b) True
31. 31.Which job needs a motor? (a) turn to an exact angle (b) move water to plants (c) open a gate to 90° (d) spin a robot’s wheels
32. 32.True or false: to make a parking alarm, use a distance sensor. (a) False (b) True
33. 33.🔍 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?
34. 34.🔍 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)?
35. 35.⚙️ Which actuator would you use to show the temperature? (a) a display (b) a servo motor (c) a buzzer (d) a pump
36. 36.🔍 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)?
37. 37.⚙️ Which actuator would you use to spin a robot’s wheels? (a) a buzzer (b) a motor (c) a display (d) a pump
38. 38.True or false: to water a dry plant, use a temperature sensor. (a) True (b) False
39. 39.🔍 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?
40. 40.🔍 An object is 204 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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