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Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 509 · 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 usually turns 0° to 180°? (a) a DC motor (b) a servo motor
  2. 2.🦾 A servo moves from 50° to 170°. How many degrees does it turn?
  3. 3.🦾 A servo program runs:
    angle = 0
    angle = angle + 20
    angle = angle − 10
    angle = angle + 50
    angle = angle + 30
    To what angle (in degrees) does the servo turn in the end?
  4. 4.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a servo motor (b) a DC motor (c) a fan (d) a buzzer
  5. 5.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?
  6. 6.⚙️ A common servo can turn from 0° up to about … (a) 10° (b) 1800° (c) 180° (d) 18°
  7. 7.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a servo motor (b) a DC motor
  8. 8.True or false: “usually turns 0° to 180°” is true of a DC motor. (a) True (b) False
  9. 9.🦾 A servo moves from 100° to 30°. How many degrees does it turn?
  10. 10.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
  11. 11.🦾 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 left (b) points up and left (c) points right (d) points straight up
  12. 12.🦾 A servo moves from 140° to 40°. How many degrees does it turn?
  13. 13.🦾 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 left (b) points up and right (c) points right (d) points straight up
  14. 14.🦾 A servo program runs:
    angle = 130
    angle = angle + 30
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
  15. 15.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a DC motor (b) a light sensor (c) a buzzer (d) a servo motor
  16. 16.🦾 A servo program runs:
    angle = 100
    angle = angle − 20
    angle = angle − 50
    To what angle (in degrees) does the servo turn in the end?
  17. 17.🦾 A servo program runs:
    angle = 0
    angle = angle + 50
    angle = angle + 60
    angle = angle − 60
    angle = angle − 30
    To what angle (in degrees) does the servo turn in the end?
  18. 18.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
  19. 19.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
  20. 20.🦾 A servo moves from 180° to 10°. How many degrees does it turn?
  21. 21.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a DC motor (b) a servo motor
  22. 22.🦾 A servo program runs:
    angle = 100
    angle = angle − 10
    angle = angle + 50
    angle = angle + 30
    To what angle (in degrees) does the servo turn in the end?
  23. 23.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
  24. 24.True or false: “spins faster with more V” is true of a DC motor. (a) False (b) True
  25. 25.True or false: “moves an arm joint” is true of a DC motor. (a) False (b) True
  26. 26.⚙️ DC motor or servo motor: which one drives the wheels? (a) a DC motor (b) a servo motor
  27. 27.⚙️ DC motor or servo motor: which one has a signal wire? (a) a DC motor (b) a servo motor
  28. 28.True or false: “holds a set angle” is true of a servo motor. (a) True (b) False
  29. 29.🦾 A servo moves from 80° to 140°. How many degrees does it turn?
  30. 30.⚙️ DC motor or servo motor: which one spins round and round? (a) a servo motor (b) a DC motor
  31. 31.⚙️ DC motor or servo motor: which one holds a set angle? (a) a servo motor (b) a DC motor
  32. 32.🦾 A servo program runs:
    angle = 80
    angle = angle − 30
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
  33. 33.⚙️ How do you make a DC motor spin the other way? (a) add more wheels (b) paint it red (c) shake it (d) swap its two wires
  34. 34.True or false: “has a signal wire” is true of a servo motor. (a) True (b) False
  35. 35.🦾 A servo program runs:
    angle = 120
    angle = angle + 20
    angle = angle − 10
    angle = angle − 30
    To what angle (in degrees) does the servo turn in the end?
  36. 36.🦾 A servo moves from 160° to 80°. How many degrees does it turn?
  37. 37.🦾 A servo moves from 160° to 70°. How many degrees does it turn?
  38. 38.🦾 A servo program runs:
    angle = 20
    angle = angle − 10
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
  39. 39.True or false: “has just two wires” is true of a servo motor. (a) False (b) True
  40. 40.🦾 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 right (d) points up and right

Answer key

  1. a servo motor
  2. 120
  3. 90
  4. a servo motor
  5. 250
  6. 180°
  7. a DC motor
  8. False
  9. 70
  10. 100
  11. points left
  12. 100
  13. points right
  14. 150
  15. a DC motor
  16. 30
  17. 20
  18. 200
  19. 300
  20. 170
  21. a servo motor
  22. 170
  23. 50
  24. True
  25. False
  26. a DC motor
  27. a servo motor
  28. True
  29. 60
  30. a DC motor
  31. a servo motor
  32. 60
  33. swap its two wires
  34. True
  35. 100
  36. 80
  37. 90
  38. 20
  39. False
  40. points up and right

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