Electronics Worksheet: Sensors and Actuators

Electronics lesson 26: Sensors and actuators · Set 253 · 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.⚙️ What is an actuator? (a) a sensor (b) a battery (c) an output that acts (d) a program
2. 2.Which job needs a pump? (a) beep an alarm (b) turn to an exact angle (c) move water to plants (d) spin a robot’s wheels
3. 3.🔍 Which sensor would you use to open blinds at sunrise? (a) a distance sensor (b) a rain sensor (c) a temperature sensor (d) a light sensor
4. 4.🔍 For a microcontroller, is a sensor an input or an output? (a) an output (b) an input (c) a power source (d) a fuse
5. 5.🔍 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?
6. 6.🔍 Which sensor would you use to start a fan when hot? (a) a distance sensor (b) a motion sensor (c) a soil moisture sensor (d) a temperature sensor
7. 7.Which job needs a motion sensor? (a) spot someone walking in (b) make a parking alarm (c) switch on with a clap (d) switch on lamps at dusk
8. 8.🔍 An object is 187 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
9. 9.🔍 Which sensor would you use to spot someone walking in? (a) a soil moisture sensor (b) a gas sensor (c) a light sensor (d) a motion sensor
10. 10.Which job needs a soil moisture sensor? (a) water a dry plant (b) open blinds at sunrise (c) switch on with a clap (d) spot someone walking in
11. 11.Which job needs a sound sensor? (a) measure classroom noise (b) switch on lamps at dusk (c) warn of a gas leak (d) close a window in rain
12. 12.🔍 Which sensor would you use to switch on lamps at dusk? (a) a rain sensor (b) a light sensor (c) a gas sensor (d) a soil moisture sensor
13. 13.Which job needs an LED? (a) beep an alarm (b) move water to plants (c) show a status light (d) turn to an exact angle
14. 14.Which job needs a buzzer? (a) turn to an exact angle (b) show a status light (c) beep an alarm (d) show the temperature
15. 15.True or false: to warn of a gas leak, use a motion sensor. (a) False (b) True
16. 16.⚙️ Which actuator would you use to show a status light? (a) a pump (b) a buzzer (c) an LED (d) a motor
17. 17.⚙️ Which actuator would you use to turn to an exact angle? (a) a pump (b) a motor (c) a servo motor (d) an LED
18. 18.🔍 Which sensor would you use to stop a robot near walls? (a) a soil moisture sensor (b) a distance sensor (c) a gas sensor (d) a rain sensor
19. 19.🔍 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)?
20. 20.🔍 A distance sensor sends a sound pulse and hears the echo 6 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
21. 21.⚙️ Which actuator would you use to beep an alarm? (a) a buzzer (b) a pump (c) a servo motor (d) an LED
22. 22.True or false: to spot someone walking in, use a motion sensor. (a) True (b) False
23. 23.🔍 Which sensor would you use to warn of a gas leak? (a) a temperature sensor (b) a light sensor (c) a motion sensor (d) a gas sensor
24. 24.⚙️ Which actuator would you use to show the temperature? (a) a display (b) a servo motor (c) a buzzer (d) an LED
25. 25.🔍 Which sensor would you use to make a parking alarm? (a) a temperature sensor (b) a motion sensor (c) a distance sensor (d) a sound sensor
26. 26.🔍 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?
27. 27.True or false: to make a parking alarm, use a temperature sensor. (a) True (b) False
28. 28.Which job needs a gas sensor? (a) start a fan when hot (b) keep an incubator warm (c) warn of a gas leak (d) switch on with a clap
29. 29.Which job needs a display? (a) beep an alarm (b) show the temperature (c) show a status light (d) spin a robot’s wheels
30. 30.True or false: to switch on with a clap, use a temperature sensor. (a) False (b) True
31. 31.Which job needs a distance sensor? (a) switch on with a clap (b) switch on lamps at dusk (c) open blinds at sunrise (d) make a parking alarm
32. 32.Which job needs a light sensor? (a) close a window in rain (b) warn of a gas leak (c) switch on lamps at dusk (d) spot someone walking in
33. 33.True or false: to switch on lamps at dusk, use a light sensor. (a) True (b) False
34. 34.Which job needs a motor? (a) show a status light (b) show the temperature (c) move water to plants (d) spin a robot’s wheels
35. 35.🔍 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?
36. 36.Which job needs a servo motor? (a) show a status light (b) open a gate to 90° (c) spin a robot’s wheels (d) move water to plants
37. 37.Which job needs a temperature sensor? (a) start a fan when hot (b) spot someone walking in (c) measure classroom noise (d) make a parking alarm
38. 38.True or false: to open blinds at sunrise, use a light sensor. (a) False (b) True
39. 39.⚙️ Which actuator would you use to move water to plants? (a) a motor (b) an LED (c) a pump (d) a servo motor
40. 40.Which job needs a distance sensor? (a) warn of a gas leak (b) measure classroom noise (c) open blinds at sunrise (d) stop a robot near walls

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