Electronics Worksheet: Sensors and Actuators

Electronics lesson 26: Sensors and actuators · Set 246 · 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) open a gate to 90° (c) move water to plants (d) show a status light
2. 2.True or false: to start a fan when hot, use a sound sensor. (a) True (b) False
3. 3.⚙️ What is an actuator? (a) a sensor (b) a battery (c) a program (d) an output that acts
4. 4.🔍 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?
5. 5.🔍 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)?
6. 6.True or false: to close a window in rain, use a temperature sensor. (a) False (b) True
7. 7.Which job needs a gas sensor? (a) open blinds at sunrise (b) warn of a gas leak (c) start a fan when hot (d) keep an incubator warm
8. 8.True or false: to make a parking alarm, use a distance sensor. (a) True (b) False
9. 9.Which job needs a soil moisture sensor? (a) warn of a gas leak (b) water a dry plant (c) stop a robot near walls (d) switch on lamps at dusk
10. 10.Which job needs a pump? (a) open a gate to 90° (b) show the temperature (c) move water to plants (d) show a status light
11. 11.Which job needs a light sensor? (a) start a fan when hot (b) make a parking alarm (c) keep an incubator warm (d) open blinds at sunrise
12. 12.True or false: to spot someone walking in, use a rain sensor. (a) True (b) False
13. 13.🔍 Which sensor would you use to spot someone walking in? (a) a temperature sensor (b) a gas sensor (c) a rain sensor (d) a motion sensor
14. 14.🔍 Which sensor would you use to start a fan when hot? (a) a sound sensor (b) a motion sensor (c) a light sensor (d) a temperature sensor
15. 15.Which job needs a temperature sensor? (a) warn of a gas leak (b) stop a robot near walls (c) keep an incubator warm (d) make a parking alarm
16. 16.🔍 For a microcontroller, is a sensor an input or an output? (a) an output (b) a fuse (c) an input (d) a power source
17. 17.Which job needs an LED? (a) spin a robot’s wheels (b) show a status light (c) turn to an exact angle (d) show the temperature
18. 18.⚙️ Which actuator would you use to move water to plants? (a) a buzzer (b) a pump (c) an LED (d) a display
19. 19.Which job needs a motor? (a) show the temperature (b) show a status light (c) open a gate to 90° (d) spin a robot’s wheels
20. 20.Which job needs a motion sensor? (a) warn of a gas leak (b) switch on with a clap (c) spot someone walking in (d) switch on lamps at dusk
21. 21.🔍 Which sensor would you use to warn of a gas leak? (a) a rain sensor (b) a soil moisture sensor (c) a gas sensor (d) a light sensor
22. 22.Which job needs a rain sensor? (a) close a window in rain (b) keep an incubator warm (c) measure classroom noise (d) switch on lamps at dusk
23. 23.True or false: to measure classroom noise, use a temperature sensor. (a) True (b) False
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 actuator would you use to beep an alarm? (a) a display (b) an LED (c) a motor (d) a buzzer
26. 26.🔍 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)?
27. 27.Which job needs a display? (a) show a status light (b) spin a robot’s wheels (c) beep an alarm (d) show the temperature
28. 28.Which job needs a servo motor? (a) beep an alarm (b) show a status light (c) spin a robot’s wheels (d) turn to an exact angle
29. 29.🔍 Which sensor would you use to measure classroom noise? (a) a sound sensor (b) a motion sensor (c) a light sensor (d) a gas sensor
30. 30.🔍 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)?
31. 31.🔍 Which sensor would you use to switch on lamps at dusk? (a) a rain sensor (b) a sound sensor (c) a soil moisture sensor (d) a light sensor
32. 32.Which job needs a sound sensor? (a) open blinds at sunrise (b) water a dry plant (c) spot someone walking in (d) switch on with a clap
33. 33.Which job needs a sound sensor? (a) measure classroom noise (b) start a fan when hot (c) open blinds at sunrise (d) warn of a gas leak
34. 34.True or false: to switch on with a clap, use a sound sensor. (a) False (b) True
35. 35.🔍 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?
36. 36.⚙️ Which actuator would you use to show a status light? (a) an LED (b) a servo motor (c) a display (d) a pump
37. 37.True or false: to open blinds at sunrise, use a light sensor. (a) True (b) False
38. 38.True or false: to start a fan when hot, use a rain sensor. (a) False (b) True
39. 39.⚙️ Which actuator would you use to turn to an exact angle? (a) a servo motor (b) a motor (c) a display (d) an LED
40. 40.⚙️ Which actuator would you use to spin a robot’s wheels? (a) a servo motor (b) an LED (c) a pump (d) a motor

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