Electronics Worksheet: Sensors and Actuators

Electronics lesson 26: Sensors and actuators · Set 74 · 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 sensor would you use to start a fan when hot? (a) a light sensor (b) a sound sensor (c) a temperature sensor (d) a distance sensor
2. 2.🔍 Which sensor would you use to switch on with a clap? (a) a soil moisture sensor (b) a distance sensor (c) a sound sensor (d) a gas sensor
3. 3.🔍 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?
4. 4.Which job needs a motor? (a) show a status light (b) turn to an exact angle (c) spin a robot’s wheels (d) move water to plants
5. 5.⚙️ Which actuator would you use to show the temperature? (a) a servo motor (b) a motor (c) a pump (d) a display
6. 6.Which job needs a servo motor? (a) move water to plants (b) spin a robot’s wheels (c) turn to an exact angle (d) show a status light
7. 7.🔍 For a microcontroller, is a sensor an input or an output? (a) an input (b) an output (c) a fuse (d) a power source
8. 8.🔍 A distance sensor sends a sound pulse and hears the echo 10 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
9. 9.True or false: to switch on lamps at dusk, use a temperature sensor. (a) True (b) False
10. 10.⚙️ What is an actuator? (a) an output that acts (b) a sensor (c) a program (d) a battery
11. 11.True or false: to switch on with a clap, use a sound sensor. (a) False (b) True
12. 12.⚙️ Which actuator would you use to spin a robot’s wheels? (a) a display (b) a buzzer (c) a motor (d) a pump
13. 13.Which job needs a temperature sensor? (a) stop a robot near walls (b) start a fan when hot (c) water a dry plant (d) spot someone walking in
14. 14.Which job needs a temperature sensor? (a) switch on with a clap (b) water a dry plant (c) warn of a gas leak (d) keep an incubator warm
15. 15.True or false: to start a fan when hot, use a distance sensor. (a) True (b) False
16. 16.Which job needs a buzzer? (a) open a gate to 90° (b) turn to an exact angle (c) show a status light (d) beep an alarm
17. 17.Which job needs a distance sensor? (a) switch on lamps at dusk (b) warn of a gas leak (c) start a fan when hot (d) make a parking alarm
18. 18.🔍 Which sensor would you use to close a window in rain? (a) a soil moisture sensor (b) a rain sensor (c) a temperature sensor (d) a sound sensor
19. 19.Which job needs a pump? (a) spin a robot’s wheels (b) beep an alarm (c) show a status light (d) move water to plants
20. 20.Which job needs a soil moisture sensor? (a) open blinds at sunrise (b) keep an incubator warm (c) switch on with a clap (d) water a dry plant
21. 21.Which job needs a light sensor? (a) stop a robot near walls (b) start a fan when hot (c) open blinds at sunrise (d) keep an incubator warm
22. 22.Which job needs a sound sensor? (a) spot someone walking in (b) close a window in rain (c) keep an incubator warm (d) measure classroom noise
23. 23.True or false: to warn of a gas leak, use a light sensor. (a) True (b) False
24. 24.Which job needs a gas sensor? (a) warn of a gas leak (b) keep an incubator warm (c) start a fan when hot (d) stop a robot near walls
25. 25.🔍 Which sensor would you use to spot someone walking in? (a) a motion sensor (b) a rain sensor (c) a distance sensor (d) a light sensor
26. 26.Which job needs a display? (a) open a gate to 90° (b) spin a robot’s wheels (c) beep an alarm (d) show the temperature
27. 27.🔍 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
28. 28.🔍 Which sensor would you use to make a parking alarm? (a) a distance sensor (b) a motion sensor (c) a temperature sensor (d) a sound sensor
29. 29.True or false: to start a fan when hot, use a light sensor. (a) False (b) True
30. 30.True or false: to switch on lamps at dusk, use a light sensor. (a) True (b) False
31. 31.True or false: to switch on lamps at dusk, use a distance sensor. (a) False (b) True
32. 32.Which job needs a motion sensor? (a) start a fan when hot (b) close a window in rain (c) switch on lamps at dusk (d) spot someone walking in
33. 33.Which job needs an LED? (a) show a status light (b) show the temperature (c) open a gate to 90° (d) move water to plants
34. 34.Which job needs a light sensor? (a) close a window in rain (b) warn of a gas leak (c) start a fan when hot (d) switch on lamps at dusk
35. 35.🔍 A distance sensor sends a sound pulse and hears the echo 5 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
36. 36.Which job needs a sound sensor? (a) switch on lamps at dusk (b) warn of a gas leak (c) switch on with a clap (d) spot someone walking in
37. 37.🔍 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)?
38. 38.🔍 Which sensor would you use to open blinds at sunrise? (a) a light sensor (b) a distance sensor (c) a rain sensor (d) a soil moisture sensor
39. 39.True or false: to switch on lamps at dusk, use a soil moisture sensor. (a) False (b) True
40. 40.⚙️ Which actuator would you use to open a gate to 90°? (a) a buzzer (b) a display (c) a servo motor (d) an LED

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