Electronics Worksheet: Sensors and Actuators

Electronics lesson 26: Sensors and actuators · Set 245 · 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 13 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
2. 2.🔍 Which sensor would you use to close a window in rain? (a) a temperature sensor (b) a rain sensor (c) a soil moisture sensor (d) a distance sensor
3. 3.⚙️ Which actuator would you use to show a status light? (a) an LED (b) a pump (c) a servo motor (d) a motor
4. 4.True or false: to keep an incubator warm, use a light sensor. (a) False (b) True
5. 5.True or false: to switch on lamps at dusk, use a light sensor. (a) True (b) False
6. 6.🔍 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?
7. 7.⚙️ Which actuator would you use to spin a robot’s wheels? (a) an LED (b) a servo motor (c) a display (d) a motor
8. 8.⚙️ What is an actuator? (a) an output that acts (b) a battery (c) a program (d) a sensor
9. 9.Which job needs a display? (a) spin a robot’s wheels (b) beep an alarm (c) show the temperature (d) turn to an exact angle
10. 10.Which job needs a temperature sensor? (a) spot someone walking in (b) make a parking alarm (c) water a dry plant (d) keep an incubator warm
11. 11.Which job needs a buzzer? (a) beep an alarm (b) spin a robot’s wheels (c) show the temperature (d) show a status light
12. 12.🔍 For a microcontroller, is a sensor an input or an output? (a) an input (b) a power source (c) an output (d) a fuse
13. 13.🔍 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)?
14. 14.⚙️ Which actuator would you use to open a gate to 90°? (a) a display (b) a motor (c) a servo motor (d) a buzzer
15. 15.Which job needs a distance sensor? (a) start a fan when hot (b) measure classroom noise (c) stop a robot near walls (d) water a dry plant
16. 16.⚙️ Which actuator would you use to show the temperature? (a) a buzzer (b) an LED (c) a servo motor (d) a display
17. 17.🔍 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?
18. 18.True or false: to measure classroom noise, use a gas sensor. (a) False (b) True
19. 19.⚙️ Which actuator would you use to turn to an exact angle? (a) a motor (b) a buzzer (c) a servo motor (d) a display
20. 20.Which job needs a servo motor? (a) show a status light (b) show the temperature (c) turn to an exact angle (d) move water to plants
21. 21.🔍 Which sensor would you use to keep an incubator warm? (a) a gas sensor (b) a rain sensor (c) a temperature sensor (d) a motion sensor
22. 22.Which job needs a motor? (a) move water to plants (b) show a status light (c) turn to an exact angle (d) spin a robot’s wheels
23. 23.Which job needs a soil moisture sensor? (a) keep an incubator warm (b) spot someone walking in (c) close a window in rain (d) water a dry plant
24. 24.Which job needs a temperature sensor? (a) spot someone walking in (b) switch on with a clap (c) open blinds at sunrise (d) start a fan when hot
25. 25.Which job needs an LED? (a) turn to an exact angle (b) show a status light (c) spin a robot’s wheels (d) open a gate to 90°
26. 26.Which job needs a motion sensor? (a) stop a robot near walls (b) spot someone walking in (c) measure classroom noise (d) warn of a gas leak
27. 27.True or false: to warn of a gas leak, use a temperature sensor. (a) True (b) False
28. 28.🔍 Which sensor would you use to make a parking alarm? (a) a distance sensor (b) a motion sensor (c) a light sensor (d) a rain sensor
29. 29.🔍 An object is 306 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
30. 30.🔍 Which sensor would you use to warn of a gas leak? (a) a temperature sensor (b) a gas sensor (c) a motion sensor (d) a distance sensor
31. 31.Which job needs a rain sensor? (a) switch on with a clap (b) close a window in rain (c) stop a robot near walls (d) switch on lamps at dusk
32. 32.Which job needs a light sensor? (a) switch on lamps at dusk (b) spot someone walking in (c) measure classroom noise (d) keep an incubator warm
33. 33.🔍 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)?
34. 34.Which job needs a distance sensor? (a) start a fan when hot (b) make a parking alarm (c) measure classroom noise (d) keep an incubator warm
35. 35.🔍 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?
36. 36.True or false: to switch on with a clap, use a rain sensor. (a) False (b) True
37. 37.⚙️ Which actuator would you use to beep an alarm? (a) a motor (b) a buzzer (c) a servo motor (d) an LED
38. 38.🔍 Which sensor would you use to measure classroom noise? (a) a rain sensor (b) a temperature sensor (c) a light sensor (d) a sound sensor
39. 39.🔍 Which sensor would you use to spot someone walking in? (a) a motion sensor (b) a sound sensor (c) a gas sensor (d) a distance sensor
40. 40.🔍 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)?

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