Electronics Worksheet: Sensors and Actuators

Electronics lesson 26: Sensors and actuators · Set 169 · 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 show a status light? (a) a display (b) a servo motor (c) an LED (d) a pump
2. 2.⚙️ What is an actuator? (a) an output that acts (b) a sensor (c) a program (d) a battery
3. 3.True or false: to close a window in rain, use a distance sensor. (a) True (b) False
4. 4.True or false: to switch on lamps at dusk, use a motion sensor. (a) False (b) True
5. 5.True or false: to spot someone walking in, use a temperature sensor. (a) True (b) False
6. 6.🔍 For a microcontroller, is a sensor an input or an output? (a) a fuse (b) an output (c) an input (d) a power source
7. 7.Which job needs a motor? (a) beep an alarm (b) turn to an exact angle (c) open a gate to 90° (d) spin a robot’s wheels
8. 8.🔍 Which sensor would you use to stop a robot near walls? (a) a distance sensor (b) a soil moisture sensor (c) a motion sensor (d) a gas sensor
9. 9.Which job needs a buzzer? (a) beep an alarm (b) spin a robot’s wheels (c) turn to an exact angle (d) show a status light
10. 10.🔍 An object is 17 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
11. 11.🔍 Which sensor would you use to warn of a gas leak? (a) a soil moisture sensor (b) a sound sensor (c) a temperature sensor (d) a gas sensor
12. 12.⚙️ Which actuator would you use to spin a robot’s wheels? (a) a display (b) an LED (c) a buzzer (d) a motor
13. 13.🔍 A distance sensor sends a sound pulse and hears the echo 9 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
14. 14.🔍 Which sensor would you use to close a window in rain? (a) a rain sensor (b) a soil moisture sensor (c) a light sensor (d) a sound sensor
15. 15.Which job needs a gas sensor? (a) warn of a gas leak (b) stop a robot near walls (c) measure classroom noise (d) spot someone walking in
16. 16.Which job needs a temperature sensor? (a) switch on with a clap (b) warn of a gas leak (c) spot someone walking in (d) start a fan when hot
17. 17.🔍 Which sensor would you use to measure classroom noise? (a) a soil moisture sensor (b) a sound sensor (c) a temperature sensor (d) a rain sensor
18. 18.🔍 Which sensor would you use to switch on lamps at dusk? (a) a sound sensor (b) a motion sensor (c) a light sensor (d) a temperature sensor
19. 19.⚙️ Which actuator would you use to open a gate to 90°? (a) a motor (b) an LED (c) a servo motor (d) a pump
20. 20.🔍 Which sensor would you use to open blinds at sunrise? (a) a gas sensor (b) a soil moisture sensor (c) a motion sensor (d) a light sensor
21. 21.⚙️ Which actuator would you use to beep an alarm? (a) a motor (b) a pump (c) a display (d) a buzzer
22. 22.Which job needs a motion sensor? (a) water a dry plant (b) spot someone walking in (c) start a fan when hot (d) switch on lamps at dusk
23. 23.⚙️ Which actuator would you use to move water to plants? (a) a servo motor (b) a display (c) a motor (d) a pump
24. 24.⚙️ Which actuator would you use to turn to an exact angle? (a) a motor (b) a servo motor (c) a pump (d) a display
25. 25.True or false: to measure classroom noise, use a sound sensor. (a) True (b) False
26. 26.True or false: to warn of a gas leak, use a light sensor. (a) False (b) True
27. 27.Which job needs a soil moisture sensor? (a) stop a robot near walls (b) keep an incubator warm (c) warn of a gas leak (d) water a dry plant
28. 28.🔍 Which sensor would you use to switch on with a clap? (a) a rain sensor (b) a distance sensor (c) a sound sensor (d) a temperature sensor
29. 29.True or false: to switch on with a clap, use a temperature sensor. (a) False (b) True
30. 30.Which job needs a temperature sensor? (a) stop a robot near walls (b) water a dry plant (c) switch on lamps at dusk (d) keep an incubator warm
31. 31.🔍 Which sensor would you use to start a fan when hot? (a) a rain sensor (b) a motion sensor (c) a distance sensor (d) a temperature sensor
32. 32.⚙️ Which actuator would you use to show the temperature? (a) a display (b) a pump (c) a servo motor (d) an LED
33. 33.True or false: to measure classroom noise, use a gas sensor. (a) False (b) True
34. 34.🔍 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?
35. 35.🔍 An object is 51 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
36. 36.🔍 Which sensor would you use to spot someone walking in? (a) a motion sensor (b) a soil moisture sensor (c) a light sensor (d) a temperature sensor
37. 37.Which job needs a display? (a) show the temperature (b) open a gate to 90° (c) move water to plants (d) show a status light
38. 38.True or false: to open blinds at sunrise, use a distance sensor. (a) True (b) False
39. 39.🔍 A distance sensor sends a sound pulse and hears the echo 16 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
40. 40.Which job needs a servo motor? (a) spin a robot’s wheels (b) turn to an exact angle (c) show a status light (d) move water to plants

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