Electronics Worksheet: Sensors and Actuators

Electronics lesson 26: Sensors and actuators · Set 78 · 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 sensor would you use to stop a robot near walls? (a) a motion sensor (b) a light sensor (c) a gas sensor (d) a distance sensor
2. 2.⚙️ Which actuator would you use to spin a robot’s wheels? (a) a motor (b) a buzzer (c) a servo motor (d) an LED
3. 3.True or false: to warn of a gas leak, use a rain sensor. (a) True (b) False
4. 4.🔍 Which sensor would you use to warn of a gas leak? (a) a gas sensor (b) a distance sensor (c) a light sensor (d) a rain sensor
5. 5.🔍 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?
6. 6.⚙️ Which actuator would you use to show a status light? (a) an LED (b) a motor (c) a buzzer (d) a pump
7. 7.⚙️ Which actuator would you use to move water to plants? (a) a pump (b) a display (c) an LED (d) a motor
8. 8.Which job needs a temperature sensor? (a) close a window in rain (b) start a fan when hot (c) stop a robot near walls (d) open blinds at sunrise
9. 9.True or false: to start a fan when hot, use a light sensor. (a) True (b) False
10. 10.True or false: to close a window in rain, use a rain sensor. (a) False (b) True
11. 11.🔍 For a microcontroller, is a sensor an input or an output? (a) a power source (b) an input (c) a fuse (d) an output
12. 12.Which job needs a soil moisture sensor? (a) warn of a gas leak (b) start a fan when hot (c) measure classroom noise (d) water a dry plant
13. 13.🔍 Which sensor would you use to keep an incubator warm? (a) a motion sensor (b) a distance sensor (c) a temperature sensor (d) a light sensor
14. 14.🔍 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)?
15. 15.Which job needs a motion sensor? (a) stop a robot near walls (b) switch on lamps at dusk (c) spot someone walking in (d) open blinds at sunrise
16. 16.True or false: to switch on with a clap, use a motion sensor. (a) True (b) False
17. 17.True or false: to water a dry plant, use a soil moisture sensor. (a) True (b) False
18. 18.⚙️ Which actuator would you use to open a gate to 90°? (a) an LED (b) a display (c) a motor (d) a servo motor
19. 19.🔍 Which sensor would you use to measure classroom noise? (a) a motion sensor (b) a sound sensor (c) a soil moisture sensor (d) a light sensor
20. 20.🔍 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?
21. 21.🔍 Which sensor would you use to switch on with a clap? (a) a rain sensor (b) a light sensor (c) a sound sensor (d) a gas sensor
22. 22.🔍 Which sensor would you use to switch on lamps at dusk? (a) a gas sensor (b) a temperature sensor (c) a sound sensor (d) a light sensor
23. 23.⚙️ What is an actuator? (a) a sensor (b) a battery (c) a program (d) an output that acts
24. 24.True or false: to switch on lamps at dusk, use a light sensor. (a) False (b) True
25. 25.⚙️ Which actuator would you use to beep an alarm? (a) an LED (b) a motor (c) a buzzer (d) a pump
26. 26.🔍 Which sensor would you use to make a parking alarm? (a) a distance sensor (b) a gas sensor (c) a motion sensor (d) a light sensor
27. 27.🔍 A distance sensor sends a sound pulse and hears the echo 4 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
28. 28.🔍 An object is 221 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
29. 29.🔍 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?
30. 30.Which job needs a distance sensor? (a) make a parking alarm (b) open blinds at sunrise (c) start a fan when hot (d) keep an incubator warm
31. 31.Which job needs a gas sensor? (a) warn of a gas leak (b) make a parking alarm (c) stop a robot near walls (d) spot someone walking in
32. 32.Which job needs a servo motor? (a) show a status light (b) turn to an exact angle (c) spin a robot’s wheels (d) show the temperature
33. 33.Which job needs a light sensor? (a) water a dry plant (b) stop a robot near walls (c) switch on lamps at dusk (d) keep an incubator warm
34. 34.Which job needs a motor? (a) spin a robot’s wheels (b) show the temperature (c) move water to plants (d) open a gate to 90°
35. 35.🔍 An object is 153 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
36. 36.⚙️ Which actuator would you use to turn to an exact angle? (a) a motor (b) a buzzer (c) a pump (d) a servo motor
37. 37.Which job needs a display? (a) show the temperature (b) move water to plants (c) show a status light (d) beep an alarm
38. 38.🔍 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)?
39. 39.True or false: to warn of a gas leak, use a gas sensor. (a) True (b) False
40. 40.🔍 Which sensor would you use to close a window in rain? (a) a gas sensor (b) a soil moisture sensor (c) a temperature sensor (d) a rain sensor

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