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Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 955 · 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.🦾 A servo moves from 120° to 130°. How many degrees does it turn?
  2. 2.⚙️ DC motor or servo motor: which one holds a set angle? (a) a servo motor (b) a DC motor
  3. 3.🦾 A servo program runs:
    angle = 130
    angle = angle − 10
    angle = angle − 10
    angle = angle + 20
    angle = angle − 50
    To what angle (in degrees) does the servo turn in the end?
  4. 4.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a DC motor (b) a servo motor
  5. 5.True or false: “spins faster with more V” is true of a DC motor. (a) True (b) False
  6. 6.True or false: “usually turns 0° to 180°” is true of a DC motor. (a) True (b) False
  7. 7.🦾 A servo moves from 30° to 100°. How many degrees does it turn?
  8. 8.⚙️ DC motor or servo motor: which one spins round and round? (a) a DC motor (b) a servo motor
  9. 9.True or false: “spins round and round” is true of a servo motor. (a) True (b) False
  10. 10.🦾 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 straight up (b) points left (c) points right (d) points up and right
  11. 11.True or false: “drives the wheels” is true of a servo motor. (a) True (b) False
  12. 12.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a servo motor (b) a DC motor
  13. 13.🦾 A servo program runs:
    angle = 60
    angle = angle − 60
    angle = angle + 30
    To what angle (in degrees) does the servo turn in the end?
  14. 14.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a servo motor (b) a DC motor
  15. 15.⚙️ A common servo can turn from 0° up to about … (a) 18° (b) 10° (c) 180° (d) 1800°
  16. 16.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
  17. 17.🦾 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 left (d) points up and right
  18. 18.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a DC motor (b) a buzzer (c) a fan (d) a servo motor
  19. 19.True or false: “has just two wires” is true of a servo motor. (a) True (b) False
  20. 20.🦾 A servo moves from 70° to 0°. How many degrees does it turn?
  21. 21.🦾 A servo moves from 0° to 80°. How many degrees does it turn?
  22. 22.🦾 A servo program runs:
    angle = 0
    angle = angle + 10
    angle = angle + 30
    angle = angle − 10
    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 150°?
  24. 24.🦾 A servo moves from 120° to 170°. How many degrees does it turn?
  25. 25.⚙️ DC motor or servo motor: which one drives the wheels? (a) a servo motor (b) a DC motor
  26. 26.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
  27. 27.⚙️ 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
  28. 28.True or false: “holds a set angle” is true of a servo motor. (a) False (b) True
  29. 29.🦾 A servo program runs:
    angle = 0
    angle = angle + 20
    angle = angle + 60
    To what angle (in degrees) does the servo turn in the end?
  30. 30.🦾 A servo program runs:
    angle = 160
    angle = angle − 50
    angle = angle + 20
    To what angle (in degrees) does the servo turn in the end?
  31. 31.🦾 A servo program runs:
    angle = 20
    angle = angle + 30
    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 180°?
  33. 33.🦾 A servo program runs:
    angle = 120
    angle = angle − 30
    angle = angle + 10
    angle = angle + 10
    angle = angle − 50
    To what angle (in degrees) does the servo turn in the end?
  34. 34.True or false: “has just two wires” is true of a DC motor. (a) False (b) True
  35. 35.True or false: “moves an arm joint” is true of a DC motor. (a) False (b) True
  36. 36.🦾 A servo program runs:
    angle = 90
    angle = angle − 10
    angle = angle + 10
    angle = angle + 50
    angle = angle − 30
    To what angle (in degrees) does the servo turn in the end?
  37. 37.🦾 A servo moves from 170° to 70°. How many degrees does it turn?
  38. 38.🦾 A servo moves from 160° to 120°. How many degrees does it turn?
  39. 39.🦾 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 left (c) points up and left (d) points straight up
  40. 40.True or false: “turns to an exact angle” is true of a DC motor. (a) True (b) False

Answer key

  1. 10
  2. a servo motor
  3. 80
  4. a servo motor
  5. True
  6. False
  7. 70
  8. a DC motor
  9. False
  10. points up and right
  11. False
  12. a servo motor
  13. 30
  14. a DC motor
  15. 180°
  16. 50
  17. points up and left
  18. a servo motor
  19. False
  20. 70
  21. 80
  22. 30
  23. 250
  24. 50
  25. a DC motor
  26. 100
  27. swap its two wires
  28. True
  29. 80
  30. 130
  31. 110
  32. 300
  33. 60
  34. True
  35. False
  36. 110
  37. 100
  38. 40
  39. points left
  40. False

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