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Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 579 · 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 has a signal wire? (a) a DC motor (b) a servo motor
  2. 2.⚙️ How do you make a DC motor spin the other way? (a) add more wheels (b) swap its two wires (c) shake it (d) paint it red
  3. 3.True or false: “drives the wheels” is true of a servo motor. (a) True (b) False
  4. 4.🦾 A servo program runs:
    angle = 40
    angle = angle + 60
    angle = angle − 50
    To what angle (in degrees) does the servo turn in the end?
  5. 5.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a servo motor (b) a DC motor
  6. 6.🦾 A servo program runs:
    angle = 170
    angle = angle − 60
    angle = angle − 50
    To what angle (in degrees) does the servo turn in the end?
  7. 7.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a DC motor (b) a servo motor
  8. 8.True or false: “has a signal wire” is true of a DC motor. (a) False (b) True
  9. 9.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
  10. 10.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a servo motor (b) a DC motor
  11. 11.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
  12. 12.True or false: “spins faster with more V” is true of a DC motor. (a) True (b) False
  13. 13.🦾 A servo program runs:
    angle = 10
    angle = angle + 40
    angle = angle + 20
    angle = angle + 20
    To what angle (in degrees) does the servo turn in the end?
  14. 14.🦾 A servo program runs:
    angle = 130
    angle = angle − 20
    angle = angle + 40
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
  15. 15.True or false: “moves an arm joint” is true of a DC motor. (a) False (b) True
  16. 16.True or false: “usually turns 0° to 180°” 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 program runs:
    angle = 10
    angle = angle + 30
    angle = angle + 30
    To what angle (in degrees) does the servo turn in the end?
  19. 19.🦾 A servo program runs:
    angle = 110
    angle = angle − 50
    angle = angle + 20
    To what angle (in degrees) does the servo turn in the end?
  20. 20.True or false: “spins round and round” is true of a servo motor. (a) True (b) False
  21. 21.🦾 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 right (b) points up and left (c) points left (d) points right
  22. 22.True or false: “spins faster with more V” is true of a servo motor. (a) False (b) True
  23. 23.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a servo motor (b) a DC motor
  24. 24.True or false: “has a signal wire” is true of a servo motor. (a) False (b) True
  25. 25.🦾 A servo moves from 110° to 0°. How many degrees does it turn?
  26. 26.🦾 A servo moves from 180° to 120°. How many degrees does it turn?
  27. 27.🦾 A servo arm points right at 0°, straight up at 90° and left at 180°. It is set to 180°. Where does the arm point? (a) points right (b) points up and left (c) points straight up (d) points left
  28. 28.🦾 A servo program runs:
    angle = 60
    angle = angle + 40
    angle = angle − 60
    angle = angle − 30
    To what angle (in degrees) does the servo turn in the end?
  29. 29.🦾 A servo moves from 180° to 40°. How many degrees does it turn?
  30. 30.🦾 A servo program runs:
    angle = 90
    angle = angle + 40
    angle = angle + 20
    angle = angle − 60
    To what angle (in degrees) does the servo turn in the end?
  31. 31.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?
  32. 32.🦾 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 up and left (b) points right (c) points straight up (d) points left
  33. 33.🦾 A servo moves from 0° to 100°. How many degrees does it turn?
  34. 34.🦾 A servo moves from 100° to 80°. How many degrees does it turn?
  35. 35.⚙️ DC motor or servo motor: which one has just two wires? (a) a servo motor (b) a DC motor
  36. 36.🦾 A servo arm points right at 0°, straight up at 90° and left at 180°. It is set to 45°. Where does the arm point? (a) points up and left (b) points straight up (c) points left (d) points up and right
  37. 37.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a servo motor (b) a DC motor
  38. 38.True or false: “usually turns 0° to 180°” is true of a servo motor. (a) True (b) False
  39. 39.⚙️ A motor changes electrical energy into … (a) water (b) light (c) movement (d) sound only
  40. 40.🦾 A servo moves from 20° to 10°. How many degrees does it turn?

Answer key

  1. a servo motor
  2. swap its two wires
  3. False
  4. 50
  5. a DC motor
  6. 60
  7. a servo motor
  8. False
  9. 100
  10. a DC motor
  11. 50
  12. True
  13. 90
  14. 140
  15. False
  16. False
  17. a DC motor
  18. 70
  19. 80
  20. False
  21. points up and left
  22. False
  23. a servo motor
  24. True
  25. 110
  26. 60
  27. points left
  28. 10
  29. 140
  30. 90
  31. 250
  32. points right
  33. 100
  34. 20
  35. a DC motor
  36. points up and right
  37. a servo motor
  38. True
  39. movement
  40. 10

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