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Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 864 · 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 just two wires? (a) a servo motor (b) a DC motor
  2. 2.⚙️ DC motor or servo motor: which one has a signal wire? (a) a DC motor (b) a servo motor
  3. 3.🦾 A servo moves from 110° to 40°. How many degrees does it turn?
  4. 4.🦾 A servo program runs:
    angle = 80
    angle = angle + 50
    angle = angle − 20
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
  5. 5.⚙️ How do you make a DC motor spin the other way? (a) paint it red (b) add more wheels (c) shake it (d) swap its two wires
  6. 6.True or false: “holds a set angle” is true of a servo motor. (a) True (b) False
  7. 7.🦾 A servo program runs:
    angle = 20
    angle = angle − 20
    angle = angle + 60
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
  8. 8.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a servo motor (b) a DC motor
  9. 9.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a fan (b) a buzzer (c) a servo motor (d) a DC motor
  10. 10.True or false: “reverses if wires swap” is true of a DC motor. (a) True (b) False
  11. 11.🦾 A servo moves from 100° to 20°. How many degrees does it turn?
  12. 12.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a servo motor (b) a DC motor
  13. 13.🦾 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 straight up (b) points up and left (c) points right (d) points left
  14. 14.🦾 A servo program runs:
    angle = 50
    angle = angle + 30
    angle = angle − 40
    angle = angle + 20
    To what angle (in degrees) does the servo turn in the end?
  15. 15.True or false: “has a signal wire” is true of a servo motor. (a) True (b) False
  16. 16.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
  17. 17.True or false: “spins faster with more V” is true of a servo motor. (a) False (b) True
  18. 18.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a DC motor (b) a servo motor
  19. 19.True or false: “spins faster with more V” is true of a DC motor. (a) False (b) True
  20. 20.⚙️ A common servo can turn from 0° up to about … (a) 18° (b) 1800° (c) 180° (d) 10°
  21. 21.True or false: “holds a set angle” is true of a DC motor. (a) True (b) False
  22. 22.True or false: “moves an arm joint” is true of a DC motor. (a) False (b) True
  23. 23.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a servo motor (b) a DC motor
  24. 24.⚙️ DC motor or servo motor: which one drives the wheels? (a) a servo motor (b) a DC motor
  25. 25.True or false: “has just two wires” is true of a DC motor. (a) True (b) False
  26. 26.🦾 A servo moves from 130° to 90°. How many degrees does it turn?
  27. 27.🦾 A servo moves from 70° to 130°. How many degrees does it turn?
  28. 28.True or false: “spins round and round” is true of a DC motor. (a) False (b) True
  29. 29.🦾 A servo moves from 110° to 130°. How many degrees does it turn?
  30. 30.🦾 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 right (b) points right (c) points left (d) points straight up
  31. 31.🦾 A servo program runs:
    angle = 180
    angle = angle − 30
    angle = angle − 50
    angle = angle − 60
    To what angle (in degrees) does the servo turn in the end?
  32. 32.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
  33. 33.🦾 A servo program runs:
    angle = 70
    angle = angle − 60
    angle = angle + 50
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?
  34. 34.True or false: “drives the wheels” is true of a servo motor. (a) True (b) False
  35. 35.🦾 A servo program runs:
    angle = 40
    angle = angle − 40
    angle = angle + 60
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
  36. 36.🦾 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 right (b) points up and left (c) points straight up (d) points left
  37. 37.🦾 A servo program runs:
    angle = 150
    angle = angle − 30
    angle = angle + 30
    angle = angle − 20
    angle = angle + 40
    To what angle (in degrees) does the servo turn in the end?
  38. 38.🦾 A servo moves from 140° to 180°. How many degrees does it turn?
  39. 39.⚙️ DC motor or servo motor: which one spins round and round? (a) a DC motor (b) a servo motor
  40. 40.🦾 A servo program runs:
    angle = 70
    angle = angle + 50
    angle = angle + 60
    angle = angle − 60
    angle = angle − 60
    To what angle (in degrees) does the servo turn in the end?

Answer key

  1. a DC motor
  2. a servo motor
  3. 70
  4. 120
  5. swap its two wires
  6. True
  7. 50
  8. a servo motor
  9. a servo motor
  10. True
  11. 80
  12. a DC motor
  13. points up and left
  14. 60
  15. True
  16. 300
  17. False
  18. a servo motor
  19. True
  20. 180°
  21. False
  22. False
  23. a servo motor
  24. a DC motor
  25. True
  26. 40
  27. 60
  28. True
  29. 20
  30. points right
  31. 40
  32. 200
  33. 40
  34. False
  35. 50
  36. points straight up
  37. 170
  38. 40
  39. a DC motor
  40. 60

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