Electronics Worksheet: Sensors and Actuators

Electronics lesson 26: Sensors and actuators · Set 101 · 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.True or false: to close a window in rain, use a rain sensor. (a) False (b) True
2. 2.🔍 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)?
3. 3.🔍 Which sensor would you use to stop a robot near walls? (a) a light sensor (b) a motion sensor (c) a distance sensor (d) a temperature sensor
4. 4.Which job needs a pump? (a) open a gate to 90° (b) spin a robot’s wheels (c) move water to plants (d) turn to an exact angle
5. 5.Which job needs a gas sensor? (a) warn of a gas leak (b) keep an incubator warm (c) measure classroom noise (d) switch on with a clap
6. 6.True or false: to switch on lamps at dusk, use a rain sensor. (a) False (b) True
7. 7.🔍 Which sensor would you use to warn of a gas leak? (a) a motion sensor (b) a temperature sensor (c) a light sensor (d) a gas sensor
8. 8.🔍 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)?
9. 9.🔍 Which sensor would you use to open blinds at sunrise? (a) a gas sensor (b) a distance sensor (c) a soil moisture sensor (d) a light sensor
10. 10.True or false: to switch on lamps at dusk, use a light sensor. (a) False (b) True
11. 11.⚙️ Which actuator would you use to open a gate to 90°? (a) a servo motor (b) a pump (c) a display (d) a buzzer
12. 12.Which job needs a light sensor? (a) start a fan when hot (b) stop a robot near walls (c) switch on lamps at dusk (d) warn of a gas leak
13. 13.True or false: to make a parking alarm, use a distance sensor. (a) True (b) False
14. 14.Which job needs a buzzer? (a) open a gate to 90° (b) show a status light (c) spin a robot’s wheels (d) beep an alarm
15. 15.True or false: to switch on lamps at dusk, use a distance sensor. (a) False (b) True
16. 16.🔍 For a microcontroller, is a sensor an input or an output? (a) an output (b) a fuse (c) a power source (d) an input
17. 17.🔍 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)?
18. 18.True or false: to start a fan when hot, use a motion sensor. (a) False (b) True
19. 19.True or false: to switch on with a clap, use a sound sensor. (a) True (b) False
20. 20.🔍 Which sensor would you use to make a parking alarm? (a) a distance sensor (b) a rain sensor (c) a motion sensor (d) a light sensor
21. 21.⚙️ Which actuator would you use to show the temperature? (a) a motor (b) a servo motor (c) a pump (d) a display
22. 22.🔍 Which sensor would you use to keep an incubator warm? (a) a temperature sensor (b) a soil moisture sensor (c) a rain sensor (d) a distance sensor
23. 23.Which job needs a display? (a) show a status light (b) open a gate to 90° (c) beep an alarm (d) show the temperature
24. 24.🔍 Which sensor would you use to switch on lamps at dusk? (a) a distance sensor (b) a soil moisture sensor (c) a gas sensor (d) a light sensor
25. 25.Which job needs a sound sensor? (a) make a parking alarm (b) spot someone walking in (c) switch on with a clap (d) switch on lamps at dusk
26. 26.⚙️ What is an actuator? (a) a sensor (b) a battery (c) an output that acts (d) a program
27. 27.Which job needs a sound sensor? (a) close a window in rain (b) open blinds at sunrise (c) start a fan when hot (d) measure classroom noise
28. 28.Which job needs a temperature sensor? (a) measure classroom noise (b) close a window in rain (c) spot someone walking in (d) keep an incubator warm
29. 29.Which job needs a motion sensor? (a) water a dry plant (b) make a parking alarm (c) close a window in rain (d) spot someone walking in
30. 30.Which job needs a distance sensor? (a) switch on lamps at dusk (b) switch on with a clap (c) open blinds at sunrise (d) make a parking alarm
31. 31.🔍 Which sensor would you use to spot someone walking in? (a) a gas sensor (b) a motion sensor (c) a rain sensor (d) a sound sensor
32. 32.Which job needs a soil moisture sensor? (a) water a dry plant (b) switch on lamps at dusk (c) make a parking alarm (d) switch on with a clap
33. 33.Which job needs an LED? (a) open a gate to 90° (b) turn to an exact angle (c) show a status light (d) spin a robot’s wheels
34. 34.🔍 Which sensor would you use to switch on with a clap? (a) a sound sensor (b) a light sensor (c) a rain sensor (d) a motion sensor
35. 35.Which job needs a rain sensor? (a) keep an incubator warm (b) open blinds at sunrise (c) spot someone walking in (d) close a window in rain
36. 36.True or false: to open blinds at sunrise, use a light sensor. (a) False (b) True
37. 37.Which job needs a servo motor? (a) move water to plants (b) open a gate to 90° (c) show a status light (d) show the temperature
38. 38.True or false: to open blinds at sunrise, use a temperature sensor. (a) False (b) True
39. 39.True or false: to keep an incubator warm, use a temperature sensor. (a) False (b) True
40. 40.🔍 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?

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