Electronics Worksheet: Sensors and Actuators

Electronics lesson 26: Sensors and actuators · Set 59 · 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 sensor would you use to switch on lamps at dusk? (a) a distance sensor (b) a light sensor (c) a temperature sensor (d) a sound sensor
2. 2.⚙️ What is an actuator? (a) a program (b) a battery (c) an output that acts (d) a sensor
3. 3.🔍 An object is 68 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
4. 4.🔍 Which sensor would you use to switch on with a clap? (a) a temperature sensor (b) a sound sensor (c) a soil moisture sensor (d) a motion sensor
5. 5.🔍 For a microcontroller, is a sensor an input or an output? (a) a power source (b) an output (c) an input (d) a fuse
6. 6.🔍 Which sensor would you use to spot someone walking in? (a) a temperature sensor (b) a motion sensor (c) a soil moisture sensor (d) a light sensor
7. 7.⚙️ Which actuator would you use to turn to an exact angle? (a) a pump (b) a motor (c) a buzzer (d) a servo motor
8. 8.Which job needs a buzzer? (a) beep an alarm (b) show the temperature (c) move water to plants (d) show a status light
9. 9.Which job needs a servo motor? (a) show a status light (b) turn to an exact angle (c) show the temperature (d) move water to plants
10. 10.Which job needs a light sensor? (a) switch on lamps at dusk (b) water a dry plant (c) close a window in rain (d) start a fan when hot
11. 11.⚙️ Which actuator would you use to beep an alarm? (a) a servo motor (b) a motor (c) a buzzer (d) a display
12. 12.⚙️ Which actuator would you use to move water to plants? (a) a buzzer (b) a pump (c) a display (d) a servo motor
13. 13.Which job needs a distance sensor? (a) make a parking alarm (b) spot someone walking in (c) switch on with a clap (d) water a dry plant
14. 14.Which job needs a servo motor? (a) open a gate to 90° (b) spin a robot’s wheels (c) show a status light (d) beep an alarm
15. 15.Which job needs a sound sensor? (a) measure classroom noise (b) spot someone walking in (c) start a fan when hot (d) open blinds at sunrise
16. 16.🔍 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?
17. 17.Which job needs a soil moisture sensor? (a) close a window in rain (b) switch on lamps at dusk (c) water a dry plant (d) keep an incubator warm
18. 18.🔍 Which sensor would you use to stop a robot near walls? (a) a sound sensor (b) a distance sensor (c) a light sensor (d) a temperature sensor
19. 19.Which job needs a light sensor? (a) warn of a gas leak (b) keep an incubator warm (c) spot someone walking in (d) open blinds at sunrise
20. 20.True or false: to spot someone walking in, use a motion sensor. (a) False (b) True
21. 21.🔍 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?
22. 22.Which job needs a temperature sensor? (a) warn of a gas leak (b) measure classroom noise (c) keep an incubator warm (d) switch on lamps at dusk
23. 23.🔍 Which sensor would you use to keep an incubator warm? (a) a light sensor (b) a temperature sensor (c) a soil moisture sensor (d) a distance sensor
24. 24.🔍 A distance sensor sends a sound pulse and hears the echo 20 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
25. 25.Which job needs an LED? (a) spin a robot’s wheels (b) show the temperature (c) turn to an exact angle (d) show a status light
26. 26.True or false: to spot someone walking in, use a temperature sensor. (a) True (b) False
27. 27.True or false: to warn of a gas leak, use a distance sensor. (a) False (b) True
28. 28.🔍 A distance sensor sends a sound pulse and hears the echo 13 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
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 warn of a gas leak? (a) a gas sensor (b) a distance sensor (c) a light sensor (d) a soil moisture sensor
31. 31.🔍 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?
32. 32.⚙️ Which actuator would you use to show the temperature? (a) a pump (b) a buzzer (c) a servo motor (d) a display
33. 33.Which job needs a display? (a) spin a robot’s wheels (b) show a status light (c) beep an alarm (d) show the temperature
34. 34.🔍 An object is 272 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
35. 35.Which job needs a temperature sensor? (a) start a fan when hot (b) make a parking alarm (c) stop a robot near walls (d) switch on with a clap
36. 36.🔍 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)?
37. 37.🔍 Which sensor would you use to start a fan when hot? (a) a gas sensor (b) a distance sensor (c) a rain sensor (d) a temperature sensor
38. 38.🔍 Which sensor would you use to open blinds at sunrise? (a) a gas sensor (b) a light sensor (c) a distance sensor (d) a temperature sensor
39. 39.Which job needs a motor? (a) open a gate to 90° (b) turn to an exact angle (c) show the temperature (d) spin a robot’s wheels
40. 40.🔍 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?

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