Electronics Worksheet: Sensors and Actuators

Electronics lesson 26: Sensors and actuators · Set 297 · 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 actuator would you use to move water to plants? (a) a servo motor (b) a motor (c) a pump (d) a display
2. 2.True or false: to switch on with a clap, use a sound sensor. (a) True (b) False
3. 3.Which job needs an LED? (a) spin a robot’s wheels (b) move water to plants (c) show a status light (d) show the temperature
4. 4.True or false: to switch on lamps at dusk, use a sound sensor. (a) True (b) False
5. 5.True or false: to start a fan when hot, use a temperature sensor. (a) False (b) True
6. 6.🔍 For a microcontroller, is a sensor an input or an output? (a) a fuse (b) an output (c) a power source (d) an input
7. 7.Which job needs a motion sensor? (a) keep an incubator warm (b) spot someone walking in (c) start a fan when hot (d) switch on with a clap
8. 8.True or false: to stop a robot near walls, use a sound sensor. (a) True (b) False
9. 9.🔍 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)?
10. 10.🔍 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)?
11. 11.True or false: to switch on with a clap, use a temperature sensor. (a) True (b) False
12. 12.🔍 Which sensor would you use to start a fan when hot? (a) a sound sensor (b) a soil moisture sensor (c) a distance sensor (d) a temperature sensor
13. 13.Which job needs a display? (a) show the temperature (b) open a gate to 90° (c) turn to an exact angle (d) spin a robot’s wheels
14. 14.True or false: to water a dry plant, use a soil moisture sensor. (a) True (b) False
15. 15.Which job needs a buzzer? (a) show the temperature (b) beep an alarm (c) show a status light (d) open a gate to 90°
16. 16.⚙️ Which actuator would you use to open a gate to 90°? (a) a servo motor (b) a buzzer (c) a motor (d) an LED
17. 17.⚙️ Which actuator would you use to show the temperature? (a) a motor (b) a pump (c) a servo motor (d) a display
18. 18.True or false: to close a window in rain, use a rain sensor. (a) True (b) False
19. 19.🔍 A distance sensor sends a sound pulse and hears the echo 2 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
20. 20.Which job needs a motor? (a) spin a robot’s wheels (b) show a status light (c) beep an alarm (d) open a gate to 90°
21. 21.Which job needs a light sensor? (a) keep an incubator warm (b) stop a robot near walls (c) start a fan when hot (d) open blinds at sunrise
22. 22.True or false: to start a fan when hot, use a sound sensor. (a) False (b) True
23. 23.Which job needs a temperature sensor? (a) switch on with a clap (b) stop a robot near walls (c) keep an incubator warm (d) switch on lamps at dusk
24. 24.Which job needs a soil moisture sensor? (a) water a dry plant (b) warn of a gas leak (c) open blinds at sunrise (d) switch on with a clap
25. 25.🔍 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)?
26. 26.⚙️ What is an actuator? (a) a sensor (b) a battery (c) an output that acts (d) a program
27. 27.🔍 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?
28. 28.🔍 Which sensor would you use to switch on with a clap? (a) a soil moisture sensor (b) a temperature sensor (c) a light sensor (d) a sound sensor
29. 29.🔍 A distance sensor sends a sound pulse and hears the echo 1 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
30. 30.🔍 Which sensor would you use to measure classroom noise? (a) a light sensor (b) a rain sensor (c) a sound sensor (d) a distance sensor
31. 31.Which job needs a temperature sensor? (a) switch on lamps at dusk (b) start a fan when hot (c) open blinds at sunrise (d) spot someone walking in
32. 32.🔍 Which sensor would you use to warn of a gas leak? (a) a sound sensor (b) a temperature sensor (c) a rain sensor (d) a gas sensor
33. 33.True or false: to measure classroom noise, use a sound sensor. (a) False (b) True
34. 34.True or false: to warn of a gas leak, use a light sensor. (a) False (b) True
35. 35.🔍 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 sound sensor
36. 36.Which job needs a servo motor? (a) open a gate to 90° (b) spin a robot’s wheels (c) beep an alarm (d) move water to plants
37. 37.⚙️ Which actuator would you use to show a status light? (a) an LED (b) a pump (c) a display (d) a buzzer
38. 38.⚙️ Which actuator would you use to beep an alarm? (a) an LED (b) a buzzer (c) a display (d) a servo motor
39. 39.Which job needs a distance sensor? (a) measure classroom noise (b) switch on with a clap (c) keep an incubator warm (d) make a parking alarm
40. 40.🔍 Which sensor would you use to keep an incubator warm? (a) a sound sensor (b) a light sensor (c) a soil moisture sensor (d) a temperature sensor

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