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Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 481 · 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 program runs:
    angle = 10
    angle = angle + 20
    angle = angle + 50
    angle = angle − 40
    To what angle (in degrees) does the servo turn in the end?
  2. 2.🦾 A servo moves from 100° to 160°. How many degrees does it turn?
  3. 3.True or false: “turns to an exact angle” is true of a servo motor. (a) True (b) False
  4. 4.🦾 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 left (b) points up and left (c) points up and right (d) points straight up
  5. 5.🦾 A servo program runs:
    angle = 100
    angle = angle + 40
    angle = angle + 10
    angle = angle − 40
    To what angle (in degrees) does the servo turn in the end?
  6. 6.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?
  7. 7.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a DC motor (b) a servo motor (c) a light sensor (d) a buzzer
  8. 8.⚙️ A common servo can turn from 0° up to about … (a) 10° (b) 18° (c) 180° (d) 1800°
  9. 9.True or false: “spins faster with more V” is true of a DC motor. (a) False (b) True
  10. 10.True or false: “spins faster with more V” is true of a servo motor. (a) True (b) False
  11. 11.🦾 A servo program runs:
    angle = 110
    angle = angle + 50
    angle = angle − 50
    To what angle (in degrees) does the servo turn in the end?
  12. 12.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a DC motor (b) a servo motor
  13. 13.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a servo motor (b) a DC motor
  14. 14.True or false: “spins round and round” is true of a servo motor. (a) False (b) True
  15. 15.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a servo motor (b) a DC motor
  16. 16.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a DC motor (b) a servo motor
  17. 17.True or false: “holds a set angle” is true of a DC motor. (a) False (b) True
  18. 18.🦾 A servo moves from 80° to 180°. How many degrees does it turn?
  19. 19.True or false: “spins round and round” is true of a DC motor. (a) False (b) True
  20. 20.🦾 A servo program runs:
    angle = 90
    angle = angle − 20
    angle = angle − 30
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
  21. 21.True or false: “has a signal wire” is true of a servo motor. (a) False (b) True
  22. 22.🦾 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 right (c) points straight up (d) points up and left
  23. 23.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
  24. 24.⚙️ How do you make a DC motor spin the other way? (a) swap its two wires (b) shake it (c) paint it red (d) add more wheels
  25. 25.🦾 A servo program runs:
    angle = 0
    angle = angle + 50
    angle = angle + 60
    To what angle (in degrees) does the servo turn in the end?
  26. 26.True or false: “reverses if wires swap” is true of a DC motor. (a) True (b) False
  27. 27.⚙️ DC motor or servo motor: which one has a signal wire? (a) a DC motor (b) a servo motor
  28. 28.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
  29. 29.⚙️ DC motor or servo motor: which one spins round and round? (a) a DC motor (b) a servo motor
  30. 30.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a buzzer (b) a DC motor (c) a servo motor (d) a fan
  31. 31.True or false: “drives the wheels” is true of a DC motor. (a) False (b) True
  32. 32.🦾 A servo program runs:
    angle = 90
    angle = angle − 60
    angle = angle + 10
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?
  33. 33.True or false: “drives the wheels” is true of a servo motor. (a) False (b) True
  34. 34.🦾 A servo program runs:
    angle = 90
    angle = angle − 30
    angle = angle − 10
    angle = angle + 60
    To what angle (in degrees) does the servo turn in the end?
  35. 35.True or false: “holds a set angle” is true of a servo motor. (a) True (b) False
  36. 36.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
  37. 37.🦾 A servo moves from 0° to 60°. How many degrees does it turn?
  38. 38.🦾 A servo program runs:
    angle = 50
    angle = angle + 60
    angle = angle + 30
    angle = angle − 60
    To what angle (in degrees) does the servo turn in the end?
  39. 39.⚙️ DC motor or servo motor: which one drives the wheels? (a) a servo motor (b) a DC motor
  40. 40.⚙️ DC motor or servo motor: which one has just two wires? (a) a DC motor (b) a servo motor

Answer key

  1. 40
  2. 60
  3. True
  4. points up and right
  5. 110
  6. 250
  7. a DC motor
  8. 180°
  9. True
  10. False
  11. 110
  12. a servo motor
  13. a servo motor
  14. False
  15. a DC motor
  16. a DC motor
  17. False
  18. 100
  19. True
  20. 30
  21. True
  22. points straight up
  23. 300
  24. swap its two wires
  25. 110
  26. True
  27. a servo motor
  28. 50
  29. a DC motor
  30. a servo motor
  31. True
  32. 20
  33. False
  34. 110
  35. True
  36. 200
  37. 60
  38. 80
  39. a DC motor
  40. a DC motor

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