Electronics Worksheet: Sensors and Actuators

Electronics lesson 26: Sensors and actuators · Set 91 · 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 beep an alarm? (a) a servo motor (b) a pump (c) a motor (d) a buzzer
2. 2.🔍 A distance sensor sends a sound pulse and hears the echo 17 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
3. 3.🔍 A distance sensor sends a sound pulse and hears the echo 14 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
4. 4.Which job needs a gas sensor? (a) stop a robot near walls (b) measure classroom noise (c) close a window in rain (d) warn of a gas leak
5. 5.Which job needs a sound sensor? (a) switch on lamps at dusk (b) water a dry plant (c) stop a robot near walls (d) measure classroom noise
6. 6.Which job needs a rain sensor? (a) close a window in rain (b) stop a robot near walls (c) warn of a gas leak (d) start a fan when hot
7. 7.⚙️ Which actuator would you use to show the temperature? (a) a motor (b) a buzzer (c) a servo motor (d) a display
8. 8.Which job needs a buzzer? (a) beep an alarm (b) open a gate to 90° (c) move water to plants (d) show a status light
9. 9.⚙️ Which actuator would you use to show a status light? (a) an LED (b) a pump (c) a servo motor (d) a buzzer
10. 10.Which job needs a distance sensor? (a) switch on lamps at dusk (b) water a dry plant (c) make a parking alarm (d) spot someone walking in
11. 11.True or false: to switch on lamps at dusk, use a light sensor. (a) False (b) True
12. 12.⚙️ Which actuator would you use to open a gate to 90°? (a) a pump (b) a motor (c) a display (d) a servo motor
13. 13.True or false: to open blinds at sunrise, use a gas sensor. (a) False (b) True
14. 14.🔍 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?
15. 15.🔍 A distance sensor sends a sound pulse and hears the echo 19 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
16. 16.⚙️ Which actuator would you use to spin a robot’s wheels? (a) a motor (b) a servo motor (c) a buzzer (d) an LED
17. 17.🔍 Which sensor would you use to switch on lamps at dusk? (a) a light sensor (b) a motion sensor (c) a soil moisture sensor (d) a temperature sensor
18. 18.🔍 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)?
19. 19.True or false: to warn of a gas leak, use a rain sensor. (a) True (b) False
20. 20.Which job needs a light sensor? (a) open blinds at sunrise (b) spot someone walking in (c) close a window in rain (d) keep an incubator warm
21. 21.⚙️ What is an actuator? (a) a battery (b) a sensor (c) a program (d) an output that acts
22. 22.Which job needs a distance sensor? (a) stop a robot near walls (b) water a dry plant (c) switch on with a clap (d) spot someone walking in
23. 23.🔍 Which sensor would you use to make a parking alarm? (a) a motion sensor (b) a distance sensor (c) a sound sensor (d) a gas sensor
24. 24.True or false: to close a window in rain, use a temperature sensor. (a) True (b) False
25. 25.Which job needs a light sensor? (a) switch on with a clap (b) switch on lamps at dusk (c) stop a robot near walls (d) start a fan when hot
26. 26.True or false: to spot someone walking in, use a motion sensor. (a) False (b) True
27. 27.🔍 For a microcontroller, is a sensor an input or an output? (a) a power source (b) a fuse (c) an input (d) an output
28. 28.⚙️ Which actuator would you use to move water to plants? (a) a buzzer (b) a motor (c) an LED (d) a pump
29. 29.Which job needs an LED? (a) show a status light (b) move water to plants (c) beep an alarm (d) turn to an exact angle
30. 30.🔍 Which sensor would you use to water a dry plant? (a) a motion sensor (b) a light sensor (c) a soil moisture sensor (d) a gas sensor
31. 31.🔍 Which sensor would you use to keep an incubator warm? (a) a temperature sensor (b) a light sensor (c) a distance sensor (d) a sound sensor
32. 32.Which job needs a motion sensor? (a) stop a robot near walls (b) start a fan when hot (c) switch on lamps at dusk (d) spot someone walking in
33. 33.True or false: to warn of a gas leak, use a gas sensor. (a) False (b) True
34. 34.True or false: to switch on with a clap, use a rain sensor. (a) True (b) False
35. 35.🔍 Which sensor would you use to spot someone walking in? (a) a rain sensor (b) a sound sensor (c) a motion sensor (d) a gas sensor
36. 36.True or false: to start a fan when hot, use a gas sensor. (a) False (b) True
37. 37.Which job needs a pump? (a) beep an alarm (b) move water to plants (c) spin a robot’s wheels (d) show the temperature
38. 38.🔍 Which sensor would you use to start a fan when hot? (a) a motion sensor (b) a sound sensor (c) a distance sensor (d) a temperature sensor
39. 39.Which job needs a sound sensor? (a) stop a robot near walls (b) spot someone walking in (c) water a dry plant (d) switch on with a clap
40. 40.Which job needs a motor? (a) spin a robot’s wheels (b) show the temperature (c) open a gate to 90° (d) turn to an exact angle

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