Electronics Worksheet: Sensors and Actuators

Electronics lesson 26: Sensors and actuators · Set 262 · 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 job needs a pump? (a) show the temperature (b) spin a robot’s wheels (c) move water to plants (d) turn to an exact angle
2. 2.⚙️ Which actuator would you use to beep an alarm? (a) an LED (b) a display (c) a pump (d) a buzzer
3. 3.⚙️ Which actuator would you use to spin a robot’s wheels? (a) a display (b) a servo motor (c) a motor (d) an LED
4. 4.Which job needs a display? (a) show a status light (b) show the temperature (c) spin a robot’s wheels (d) open a gate to 90°
5. 5.True or false: to switch on lamps at dusk, use a motion sensor. (a) False (b) True
6. 6.Which job needs a buzzer? (a) turn to an exact angle (b) show a status light (c) beep an alarm (d) open a gate to 90°
7. 7.Which job needs a servo motor? (a) show the temperature (b) open a gate to 90° (c) show a status light (d) move water to plants
8. 8.True or false: to keep an incubator warm, use a temperature sensor. (a) True (b) False
9. 9.True or false: to warn of a gas leak, use a gas sensor. (a) True (b) False
10. 10.⚙️ Which actuator would you use to show the temperature? (a) an LED (b) a buzzer (c) a motor (d) a display
11. 11.True or false: to spot someone walking in, use a motion sensor. (a) True (b) False
12. 12.Which job needs a sound sensor? (a) spot someone walking in (b) make a parking alarm (c) switch on with a clap (d) switch on lamps at dusk
13. 13.🔍 Which sensor would you use to make a parking alarm? (a) a distance sensor (b) a sound sensor (c) a gas sensor (d) a temperature sensor
14. 14.🔍 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)?
15. 15.⚙️ Which actuator would you use to show a status light? (a) a servo motor (b) a display (c) an LED (d) a buzzer
16. 16.⚙️ What is an actuator? (a) a program (b) a battery (c) an output that acts (d) a sensor
17. 17.⚙️ Which actuator would you use to turn to an exact angle? (a) a servo motor (b) a pump (c) a display (d) a motor
18. 18.🔍 Which sensor would you use to measure classroom noise? (a) a temperature sensor (b) a sound sensor (c) a light sensor (d) a soil moisture sensor
19. 19.🔍 Which sensor would you use to close a window in rain? (a) a temperature sensor (b) a light sensor (c) a gas sensor (d) a rain sensor
20. 20.True or false: to keep an incubator warm, use a light sensor. (a) False (b) True
21. 21.🔍 Which sensor would you use to stop a robot near walls? (a) a distance sensor (b) a soil moisture sensor (c) a light sensor (d) a rain sensor
22. 22.🔍 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)?
23. 23.🔍 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?
24. 24.Which job needs a gas sensor? (a) switch on lamps at dusk (b) keep an incubator warm (c) warn of a gas leak (d) start a fan when hot
25. 25.🔍 A distance sensor sends a sound pulse and hears the echo 11 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
26. 26.True or false: to open blinds at sunrise, use a soil moisture sensor. (a) True (b) False
27. 27.Which job needs a distance sensor? (a) stop a robot near walls (b) warn of a gas leak (c) switch on lamps at dusk (d) measure classroom noise
28. 28.🔍 Which sensor would you use to open blinds at sunrise? (a) a temperature sensor (b) a motion sensor (c) a sound sensor (d) a light sensor
29. 29.🔍 Which sensor would you use to water a dry plant? (a) a temperature sensor (b) a soil moisture sensor (c) a light sensor (d) a sound sensor
30. 30.🔍 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?
31. 31.True or false: to open blinds at sunrise, use a temperature sensor. (a) True (b) False
32. 32.🔍 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)?
33. 33.🔍 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)?
34. 34.True or false: to measure classroom noise, use a gas sensor. (a) False (b) True
35. 35.🔍 Which sensor would you use to spot someone walking in? (a) a distance sensor (b) a gas sensor (c) a motion sensor (d) a sound sensor
36. 36.Which job needs an LED? (a) show a status light (b) show the temperature (c) turn to an exact angle (d) spin a robot’s wheels
37. 37.🔍 For a microcontroller, is a sensor an input or an output? (a) an input (b) a power source (c) a fuse (d) an output
38. 38.🔍 Which sensor would you use to switch on with a clap? (a) a gas sensor (b) a sound sensor (c) a distance sensor (d) a temperature sensor
39. 39.🔍 Which sensor would you use to warn of a gas leak? (a) a gas sensor (b) a light sensor (c) a sound sensor (d) a temperature sensor
40. 40.🔍 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?

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