Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 654 · 40 questions

Robot tip (Spin or point): DC motor: spins continuously; swap its wires to reverse it. Servo: goes to a set angle between 0° and 180°. Servo turn = bigger angle − smaller angle (30° to 120° = 90°). A program like angle = 90, angle = angle + 30 adds and takes away degrees in order.

1. 1.⚙️ How do you make a DC motor spin the other way? (a) add more wheels (b) shake it (c) swap its two wires (d) paint it red
2. 2.True or false: “spins round and round” is true of a servo motor. (a) False (b) True
3. 3.⚙️ DC motor or servo motor: which one spins round and round? (a) a DC motor (b) a servo motor
4. 4.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a DC motor (b) a servo motor
5. 5.True or false: “turns to an exact angle” is true of a DC motor. (a) True (b) False
6. 6.🦾 A servo program runs:
   angle = 170
   angle = angle − 20
   angle = angle − 10
   angle = angle − 60
   angle = angle − 10
   To what angle (in degrees) does the servo turn in the end?
7. 7.⚙️ DC motor or servo motor: which one has just two wires? (a) a DC motor (b) a servo motor
8. 8.🦾 A servo program runs:
   angle = 10
   angle = angle − 10
   angle = angle + 40
   To what angle (in degrees) does the servo turn in the end?
9. 9.True or false: “holds a set angle” is true of a servo motor. (a) False (b) True
10. 10.🦾 A servo program runs:
    angle = 160
    angle = angle − 40
    angle = angle + 30
    To what angle (in degrees) does the servo turn in the end?
11. 11.🦾 A servo program runs:
    angle = 90
    angle = angle − 40
    angle = angle + 10
    angle = angle − 40
    angle = angle + 60
    To what angle (in degrees) does the servo turn in the end?
12. 12.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a servo motor (b) a light sensor (c) a DC motor (d) a buzzer
13. 13.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a servo motor (b) a DC motor
14. 14.True or false: “drives the wheels” is true of a servo motor. (a) False (b) True
15. 15.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?
16. 16.🦾 A servo program runs:
    angle = 30
    angle = angle + 50
    angle = angle − 30
    To what angle (in degrees) does the servo turn in the end?
17. 17.⚙️ DC motor or servo motor: which one has a signal wire? (a) a DC motor (b) a servo motor
18. 18.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a DC motor (b) a servo motor
19. 19.🦾 A servo arm points right at 0°, straight up at 90° and left at 180°. It is set to 0°. Where does the arm point? (a) points straight up (b) points up and left (c) points left (d) points right
20. 20.🦾 A servo program runs:
    angle = 140
    angle = angle + 40
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?
21. 21.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a DC motor (b) a servo motor
22. 22.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a servo motor (b) a DC motor
23. 23.True or false: “usually turns 0° to 180°” is true of a DC motor. (a) False (b) True
24. 24.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
25. 25.⚙️ A motor changes electrical energy into … (a) sound only (b) light (c) water (d) movement
26. 26.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
27. 27.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
28. 28.🦾 A servo moves from 160° to 30°. How many degrees does it turn?
29. 29.True or false: “turns to an exact angle” is true of a servo motor. (a) False (b) True
30. 30.🦾 A servo arm points right at 0°, straight up at 90° and left at 180°. It is set to 135°. Where does the arm point? (a) points left (b) points up and right (c) points straight up (d) points up and left
31. 31.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
32. 32.True or false: “moves an arm joint” is true of a DC motor. (a) False (b) True
33. 33.🦾 A servo program runs:
    angle = 30
    angle = angle + 60
    angle = angle + 20
    angle = angle − 50
    angle = angle + 50
    To what angle (in degrees) does the servo turn in the end?
34. 34.🦾 A servo moves from 50° to 20°. How many degrees does it turn?
35. 35.🦾 A servo moves from 50° to 60°. How many degrees does it turn?
36. 36.🦾 A servo program runs:
    angle = 0
    angle = angle + 40
    angle = angle + 10
    angle = angle + 60
    To what angle (in degrees) does the servo turn in the end?
37. 37.⚙️ DC motor or servo motor: which one drives the wheels? (a) a DC motor (b) a servo motor
38. 38.⚙️ DC motor or servo motor: which one holds a set angle? (a) a servo motor (b) a DC motor
39. 39.🦾 A servo program runs:
    angle = 150
    angle = angle + 10
    angle = angle − 40
    angle = angle + 40
    To what angle (in degrees) does the servo turn in the end?
40. 40.True or false: “holds a set angle” is true of a DC motor. (a) True (b) False

Free robotics lessons, practice and worksheets at talentjr.in/robotics-for-kids