Electronics Worksheet: Sensors and Actuators

Electronics lesson 26: Sensors and actuators · Set 127 · 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 servo motor? (a) open a gate to 90° (b) move water to plants (c) show a status light (d) spin a robot’s wheels
2. 2.🔍 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)?
3. 3.Which job needs a rain sensor? (a) open blinds at sunrise (b) stop a robot near walls (c) switch on with a clap (d) close a window in rain
4. 4.🔍 Which sensor would you use to open blinds at sunrise? (a) a temperature sensor (b) a soil moisture sensor (c) a light sensor (d) a rain sensor
5. 5.Which job needs an LED? (a) spin a robot’s wheels (b) beep an alarm (c) show a status light (d) move water to plants
6. 6.⚙️ Which actuator would you use to turn to an exact angle? (a) a motor (b) a display (c) a servo motor (d) a buzzer
7. 7.⚙️ What is an actuator? (a) a sensor (b) a program (c) a battery (d) an output that acts
8. 8.True or false: to make a parking alarm, use a light sensor. (a) True (b) False
9. 9.Which job needs a temperature sensor? (a) warn of a gas leak (b) make a parking alarm (c) keep an incubator warm (d) close a window in rain
10. 10.🔍 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?
11. 11.🔍 Which sensor would you use to start a fan when hot? (a) a motion sensor (b) a rain sensor (c) a temperature sensor (d) a light sensor
12. 12.🔍 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)?
13. 13.⚙️ Which actuator would you use to beep an alarm? (a) a pump (b) a buzzer (c) an LED (d) a motor
14. 14.Which job needs a motion sensor? (a) open blinds at sunrise (b) start a fan when hot (c) spot someone walking in (d) warn of a gas leak
15. 15.⚙️ Which actuator would you use to move water to plants? (a) a display (b) a buzzer (c) a pump (d) an LED
16. 16.Which job needs a buzzer? (a) open a gate to 90° (b) turn to an exact angle (c) beep an alarm (d) show the temperature
17. 17.True or false: to keep an incubator warm, use a light sensor. (a) True (b) False
18. 18.Which job needs a light sensor? (a) switch on with a clap (b) start a fan when hot (c) switch on lamps at dusk (d) close a window in rain
19. 19.True or false: to stop a robot near walls, use a rain sensor. (a) True (b) False
20. 20.🔍 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)?
21. 21.🔍 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)?
22. 22.True or false: to warn of a gas leak, use a gas sensor. (a) False (b) True
23. 23.⚙️ Which actuator would you use to show a status light? (a) a servo motor (b) a pump (c) a motor (d) an LED
24. 24.True or false: to water a dry plant, use a soil moisture sensor. (a) True (b) False
25. 25.Which job needs a soil moisture sensor? (a) keep an incubator warm (b) water a dry plant (c) measure classroom noise (d) close a window in rain
26. 26.Which job needs a temperature sensor? (a) measure classroom noise (b) spot someone walking in (c) start a fan when hot (d) open blinds at sunrise
27. 27.🔍 Which sensor would you use to make a parking alarm? (a) a distance sensor (b) a gas sensor (c) a rain sensor (d) a light sensor
28. 28.🔍 A distance sensor sends a sound pulse and hears the echo 8 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
29. 29.True or false: to switch on lamps at dusk, use a light sensor. (a) True (b) False
30. 30.🔍 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)?
31. 31.⚙️ Which actuator would you use to show the temperature? (a) a motor (b) a servo motor (c) an LED (d) a display
32. 32.Which job needs a motor? (a) turn to an exact angle (b) spin a robot’s wheels (c) beep an alarm (d) move water to plants
33. 33.True or false: to switch on with a clap, use a sound sensor. (a) False (b) True
34. 34.⚙️ Which actuator would you use to spin a robot’s wheels? (a) a pump (b) a motor (c) a display (d) a servo motor
35. 35.🔍 An object is 170 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 pump? (a) turn to an exact angle (b) open a gate to 90° (c) move water to plants (d) show a status light
37. 37.🔍 Which sensor would you use to measure classroom noise? (a) a temperature sensor (b) a soil moisture sensor (c) a light sensor (d) a sound sensor
38. 38.🔍 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?
39. 39.True or false: to spot someone walking in, use a gas sensor. (a) False (b) True
40. 40.🔍 An object is 102 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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