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Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 86 · 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.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a buzzer (b) a light sensor (c) a servo motor (d) a DC motor
  2. 2.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a servo motor (b) a DC motor
  3. 3.True or false: “has a signal wire” is true of a servo motor. (a) True (b) False
  4. 4.True or false: “has just two wires” is true of a DC motor. (a) False (b) True
  5. 5.🦾 A servo moves from 30° to 0°. How many degrees does it turn?
  6. 6.⚙️ DC motor or servo motor: which one holds a set angle? (a) a servo motor (b) a DC motor
  7. 7.🦾 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 straight up (c) points up and left (d) points left
  8. 8.🦾 A servo program runs:
    angle = 30
    angle = angle + 50
    angle = angle − 30
    angle = angle + 30
    angle = angle + 50
    To what angle (in degrees) does the servo turn in the end?
  9. 9.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a DC motor (b) a servo motor
  10. 10.🦾 A servo program runs:
    angle = 30
    angle = angle + 10
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?
  11. 11.🦾 A servo program runs:
    angle = 60
    angle = angle − 30
    angle = angle + 50
    angle = angle + 60
    angle = angle − 50
    To what angle (in degrees) does the servo turn in the end?
  12. 12.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a DC motor (b) a servo motor
  13. 13.🦾 A servo moves from 20° to 80°. How many degrees does it turn?
  14. 14.🦾 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 straight up (c) points right (d) points left
  15. 15.🦾 A servo moves from 130° to 120°. How many degrees does it turn?
  16. 16.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?
  17. 17.🦾 A servo moves from 80° to 60°. How many degrees does it turn?
  18. 18.True or false: “reverses if wires swap” is true of a DC motor. (a) False (b) True
  19. 19.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
  20. 20.🦾 A servo moves from 10° to 40°. How many degrees does it turn?
  21. 21.True or false: “drives the wheels” is true of a DC motor. (a) True (b) False
  22. 22.True or false: “moves an arm joint” is true of a servo motor. (a) False (b) True
  23. 23.🦾 A servo moves from 20° to 70°. How many degrees does it turn?
  24. 24.⚙️ DC motor or servo motor: which one has a signal wire? (a) a servo motor (b) a DC motor
  25. 25.⚙️ DC motor or servo motor: which one spins round and round? (a) a DC motor (b) a servo motor
  26. 26.⚙️ A common servo can turn from 0° up to about … (a) 180° (b) 18° (c) 1800° (d) 10°
  27. 27.🦾 A servo program runs:
    angle = 50
    angle = angle − 10
    angle = angle − 20
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?
  28. 28.⚙️ How do you make a DC motor spin the other way? (a) paint it red (b) swap its two wires (c) shake it (d) add more wheels
  29. 29.🦾 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 right (b) points left (c) points right (d) points up and left
  30. 30.🦾 A servo program runs:
    angle = 40
    angle = angle + 60
    angle = angle − 60
    To what angle (in degrees) does the servo turn in the end?
  31. 31.🦾 A servo moves from 40° to 10°. How many degrees does it turn?
  32. 32.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a fan (b) a buzzer (c) a DC motor (d) a servo motor
  33. 33.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
  34. 34.True or false: “spins faster with more V” is true of a DC motor. (a) True (b) False
  35. 35.🦾 A servo program runs:
    angle = 100
    angle = angle − 10
    angle = angle − 60
    angle = angle + 40
    angle = angle + 40
    To what angle (in degrees) does the servo turn in the end?
  36. 36.🦾 A servo program runs:
    angle = 150
    angle = angle + 30
    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 program runs:
    angle = 130
    angle = angle − 60
    angle = angle − 40
    To what angle (in degrees) does the servo turn in the end?
  38. 38.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a servo motor (b) a DC motor
  39. 39.True or false: “drives the wheels” is true of a servo motor. (a) False (b) True
  40. 40.True or false: “spins round and round” is true of a servo motor. (a) False (b) True

Answer key

  1. a DC motor
  2. a servo motor
  3. True
  4. True
  5. 30
  6. a servo motor
  7. points up and left
  8. 130
  9. a DC motor
  10. 20
  11. 90
  12. a servo motor
  13. 60
  14. points right
  15. 10
  16. 250
  17. 20
  18. True
  19. 100
  20. 30
  21. True
  22. True
  23. 50
  24. a servo motor
  25. a DC motor
  26. 180°
  27. 0
  28. swap its two wires
  29. points up and right
  30. 40
  31. 30
  32. a servo motor
  33. 50
  34. True
  35. 110
  36. 150
  37. 30
  38. a servo motor
  39. False
  40. False

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