Electronics Worksheet: Sensors and Actuators

Electronics lesson 26: Sensors and actuators · Set 34 · 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) beep an alarm (b) show the temperature (c) spin a robot’s wheels (d) turn to an exact angle
2. 2.🔍 Which sensor would you use to switch on lamps at dusk? (a) a distance sensor (b) a motion sensor (c) a rain sensor (d) a light sensor
3. 3.🔍 Which sensor would you use to switch on with a clap? (a) a sound sensor (b) a motion sensor (c) a temperature sensor (d) a rain sensor
4. 4.⚙️ What is an actuator? (a) a program (b) an output that acts (c) a battery (d) a sensor
5. 5.Which job needs a motion sensor? (a) switch on lamps at dusk (b) warn of a gas leak (c) close a window in rain (d) spot someone walking in
6. 6.⚙️ Which actuator would you use to spin a robot’s wheels? (a) an LED (b) a servo motor (c) a buzzer (d) a motor
7. 7.🔍 Which sensor would you use to stop a robot near walls? (a) a distance sensor (b) a rain sensor (c) a light sensor (d) a soil moisture sensor
8. 8.🔍 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?
9. 9.⚙️ Which actuator would you use to show a status light? (a) a servo motor (b) a motor (c) a pump (d) an LED
10. 10.True or false: to switch on with a clap, use a motion sensor. (a) True (b) False
11. 11.True or false: to water a dry plant, use a soil moisture sensor. (a) False (b) True
12. 12.⚙️ Which actuator would you use to open a gate to 90°? (a) a pump (b) a servo motor (c) an LED (d) a buzzer
13. 13.Which job needs a gas sensor? (a) make a parking alarm (b) open blinds at sunrise (c) water a dry plant (d) warn of a gas leak
14. 14.🔍 A distance sensor sends a sound pulse and hears the echo 17 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
15. 15.🔍 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)?
16. 16.🔍 For a microcontroller, is a sensor an input or an output? (a) a power source (b) an output (c) a fuse (d) an input
17. 17.🔍 Which sensor would you use to spot someone walking in? (a) a light sensor (b) a rain sensor (c) a motion sensor (d) a soil moisture sensor
18. 18.🔍 Which sensor would you use to open blinds at sunrise? (a) a sound sensor (b) a light sensor (c) a soil moisture sensor (d) a distance sensor
19. 19.🔍 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?
20. 20.🔍 An object is 153 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
21. 21.🔍 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?
22. 22.⚙️ Which actuator would you use to beep an alarm? (a) a servo motor (b) a display (c) a motor (d) a buzzer
23. 23.Which job needs a servo motor? (a) show a status light (b) open a gate to 90° (c) show the temperature (d) spin a robot’s wheels
24. 24.🔍 A distance sensor sends a sound pulse and hears the echo 18 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
25. 25.🔍 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?
26. 26.🔍 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?
27. 27.⚙️ Which actuator would you use to turn to an exact angle? (a) a servo motor (b) a display (c) a pump (d) a motor
28. 28.Which job needs a soil moisture sensor? (a) water a dry plant (b) keep an incubator warm (c) spot someone walking in (d) warn of a gas leak
29. 29.🔍 Which sensor would you use to start a fan when hot? (a) a temperature sensor (b) a gas sensor (c) a soil moisture sensor (d) a light sensor
30. 30.Which job needs a rain sensor? (a) start a fan when hot (b) close a window in rain (c) switch on with a clap (d) water a dry plant
31. 31.True or false: to spot someone walking in, use a motion sensor. (a) False (b) True
32. 32.Which job needs an LED? (a) show a status light (b) show the temperature (c) open a gate to 90° (d) spin a robot’s wheels
33. 33.🔍 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)?
34. 34.True or false: to measure classroom noise, use a distance sensor. (a) True (b) False
35. 35.🔍 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)?
36. 36.Which job needs a distance sensor? (a) stop a robot near walls (b) close a window in rain (c) start a fan when hot (d) keep an incubator warm
37. 37.🔍 Which sensor would you use to water a dry plant? (a) a gas sensor (b) a soil moisture sensor (c) a light sensor (d) a temperature sensor
38. 38.🔍 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)?
39. 39.🔍 Which sensor would you use to make a parking alarm? (a) a light sensor (b) a distance sensor (c) a motion sensor (d) a temperature sensor
40. 40.🔍 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?

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