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Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 366 · 40 questions
TalentJR

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.

NameDateTime takenScore ___ / 40
  1. 1.⚙️ DC motor or servo motor: which one holds a set angle? (a) a servo motor (b) a DC motor
  2. 2.🦾 A servo program runs:
    angle = 40
    angle = angle − 40
    angle = angle + 60
    To what angle (in degrees) does the servo turn in the end?
  3. 3.True or false: “drives the wheels” is true of a servo motor. (a) True (b) False
  4. 4.🦾 A servo moves from 100° to 130°. How many degrees does it turn?
  5. 5.True or false: “spins faster with more V” is true of a DC motor. (a) False (b) True
  6. 6.🦾 A servo program runs:
    angle = 80
    angle = angle + 20
    angle = angle + 10
    angle = angle + 60
    To what angle (in degrees) does the servo turn in the end?
  7. 7.True or false: “usually turns 0° to 180°” is true of a servo motor. (a) False (b) True
  8. 8.True or false: “turns to an exact angle” is true of a servo motor. (a) False (b) True
  9. 9.🦾 A servo program runs:
    angle = 100
    angle = angle − 10
    angle = angle + 40
    angle = angle − 50
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
  10. 10.🦾 A servo moves from 90° to 30°. How many degrees does it turn?
  11. 11.🦾 A servo arm points right at 0°, straight up at 90° and left at 180°. It is set to 90°. Where does the arm point? (a) points up and right (b) points up and left (c) points right (d) points straight up
  12. 12.True or false: “reverses if wires swap” is true of a servo motor. (a) True (b) False
  13. 13.True or false: “has a signal wire” is true of a servo motor. (a) True (b) False
  14. 14.⚙️ DC motor or servo motor: which one has a signal wire? (a) a DC motor (b) a servo motor
  15. 15.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a servo motor (b) a DC motor
  16. 16.True or false: “has a signal wire” is true of a DC motor. (a) False (b) True
  17. 17.⚙️ DC motor or servo motor: which one drives the wheels? (a) a servo motor (b) a DC motor
  18. 18.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?
  19. 19.True or false: “reverses if wires swap” is true of a DC motor. (a) False (b) True
  20. 20.🦾 A servo moves from 70° to 80°. How many degrees does it turn?
  21. 21.⚙️ DC motor or servo motor: which one has just two wires? (a) a servo motor (b) a DC motor
  22. 22.🦾 A servo moves from 130° to 140°. How many degrees does it turn?
  23. 23.True or false: “moves an arm joint” is true of a DC motor. (a) True (b) False
  24. 24.🦾 A servo program runs:
    angle = 30
    angle = angle − 20
    angle = angle + 30
    angle = angle + 30
    To what angle (in degrees) does the servo turn in the end?
  25. 25.True or false: “spins round and round” is true of a servo motor. (a) True (b) False
  26. 26.🦾 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 up and left (b) points straight up (c) points right (d) points left
  27. 27.⚙️ DC motor or servo motor: which one spins round and round? (a) a servo motor (b) a DC motor
  28. 28.🦾 A servo moves from 160° to 20°. How many degrees does it turn?
  29. 29.True or false: “has just two wires” is true of a DC motor. (a) False (b) True
  30. 30.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a DC motor (b) a fan (c) a buzzer (d) a servo motor
  31. 31.⚙️ How do you make a DC motor spin the other way? (a) swap its two wires (b) shake it (c) paint it red (d) add more wheels
  32. 32.🦾 A servo moves from 70° to 120°. How many degrees does it turn?
  33. 33.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a servo motor (b) a DC motor
  34. 34.🦾 A servo moves from 70° to 60°. How many degrees does it turn?
  35. 35.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
  36. 36.🦾 A servo program runs:
    angle = 10
    angle = angle + 20
    angle = angle + 10
    angle = angle + 30
    angle = angle + 30
    To what angle (in degrees) does the servo turn in the end?
  37. 37.🦾 A servo program runs:
    angle = 100
    angle = angle + 40
    angle = angle + 30
    To what angle (in degrees) does the servo turn in the end?
  38. 38.🦾 A servo program runs:
    angle = 40
    angle = angle + 10
    angle = angle − 20
    angle = angle − 20
    angle = angle + 20
    To what angle (in degrees) does the servo turn in the end?
  39. 39.🦾 A servo program runs:
    angle = 10
    angle = angle + 50
    angle = angle − 30
    angle = angle + 60
    To what angle (in degrees) does the servo turn in the end?
  40. 40.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?

Answer key

  1. a servo motor
  2. 60
  3. False
  4. 30
  5. True
  6. 170
  7. True
  8. True
  9. 90
  10. 60
  11. points straight up
  12. False
  13. True
  14. a servo motor
  15. a DC motor
  16. False
  17. a DC motor
  18. 250
  19. True
  20. 10
  21. a DC motor
  22. 10
  23. False
  24. 70
  25. False
  26. points up and left
  27. a DC motor
  28. 140
  29. True
  30. a servo motor
  31. swap its two wires
  32. 50
  33. a servo motor
  34. 10
  35. 300
  36. 100
  37. 170
  38. 30
  39. 90
  40. 150

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