Electronics Worksheet: Sensors and Actuators

Electronics lesson 26: Sensors and actuators · Set 170 · 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 job needs a motion sensor? (a) warn of a gas leak (b) make a parking alarm (c) spot someone walking in (d) close a window in rain
2. 2.⚙️ Which actuator would you use to spin a robot’s wheels? (a) a motor (b) an LED (c) a servo motor (d) a pump
3. 3.🔍 Which sensor would you use to switch on with a clap? (a) a light sensor (b) a sound sensor (c) a rain sensor (d) a soil moisture sensor
4. 4.🔍 For a microcontroller, is a sensor an input or an output? (a) a fuse (b) an input (c) a power source (d) an output
5. 5.Which job needs a display? (a) show the temperature (b) turn to an exact angle (c) spin a robot’s wheels (d) beep an alarm
6. 6.🔍 An object is 85 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
7. 7.Which job needs a gas sensor? (a) warn of a gas leak (b) keep an incubator warm (c) switch on lamps at dusk (d) measure classroom noise
8. 8.🔍 Which sensor would you use to open blinds at sunrise? (a) a gas sensor (b) a light sensor (c) a temperature sensor (d) a motion sensor
9. 9.Which job needs a light sensor? (a) switch on with a clap (b) warn of a gas leak (c) stop a robot near walls (d) switch on lamps at dusk
10. 10.Which job needs a temperature sensor? (a) start a fan when hot (b) close a window in rain (c) spot someone walking in (d) stop a robot near walls
11. 11.Which job needs a light sensor? (a) warn of a gas leak (b) open blinds at sunrise (c) measure classroom noise (d) keep an incubator warm
12. 12.⚙️ Which actuator would you use to beep an alarm? (a) an LED (b) a buzzer (c) a pump (d) a display
13. 13.Which job needs a motor? (a) show the temperature (b) beep an alarm (c) spin a robot’s wheels (d) turn to an exact angle
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.True or false: to switch on with a clap, use a temperature sensor. (a) False (b) True
16. 16.⚙️ Which actuator would you use to open a gate to 90°? (a) a display (b) a buzzer (c) a servo motor (d) a motor
17. 17.⚙️ What is an actuator? (a) a battery (b) a sensor (c) a program (d) an output that acts
18. 18.⚙️ Which actuator would you use to turn to an exact angle? (a) a buzzer (b) a servo motor (c) a motor (d) an LED
19. 19.True or false: to keep an incubator warm, use a light sensor. (a) False (b) True
20. 20.True or false: to spot someone walking in, use a motion sensor. (a) False (b) True
21. 21.🔍 A distance sensor sends a sound pulse and hears the echo 12 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
22. 22.🔍 An object is 119 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
23. 23.🔍 An object is 204 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
24. 24.🔍 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?
25. 25.🔍 A distance sensor sends a sound pulse and hears the echo 11 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
26. 26.True or false: to start a fan when hot, use a temperature sensor. (a) False (b) True
27. 27.Which job needs a buzzer? (a) turn to an exact angle (b) beep an alarm (c) open a gate to 90° (d) spin a robot’s wheels
28. 28.True or false: to measure classroom noise, use a rain sensor. (a) False (b) True
29. 29.⚙️ Which actuator would you use to show a status light? (a) a display (b) a pump (c) an LED (d) a motor
30. 30.Which job needs a soil moisture sensor? (a) keep an incubator warm (b) switch on lamps at dusk (c) water a dry plant (d) warn of a gas leak
31. 31.🔍 Which sensor would you use to start a fan when hot? (a) a soil moisture sensor (b) a sound sensor (c) a rain sensor (d) a temperature sensor
32. 32.🔍 Which sensor would you use to keep an incubator warm? (a) a distance sensor (b) a rain sensor (c) a light sensor (d) a temperature sensor
33. 33.True or false: to close a window in rain, use a gas sensor. (a) False (b) True
34. 34.⚙️ Which actuator would you use to show the temperature? (a) a display (b) a motor (c) a pump (d) a servo motor
35. 35.Which job needs a temperature sensor? (a) open blinds at sunrise (b) warn of a gas leak (c) measure classroom noise (d) keep an incubator warm
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.True or false: to open blinds at sunrise, use a temperature sensor. (a) False (b) True
38. 38.True or false: to make a parking alarm, use a distance sensor. (a) False (b) True
39. 39.Which job needs a pump? (a) show a status light (b) turn to an exact angle (c) move water to plants (d) spin a robot’s wheels
40. 40.True or false: to measure classroom noise, use a sound sensor. (a) True (b) False

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