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Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 804 · 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 140° to 40°. How many degrees does it turn?
  2. 2.True or false: “drives the wheels” is true of a DC motor. (a) False (b) True
  3. 3.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
  4. 4.True or false: “turns to an exact angle” is true of a servo motor. (a) True (b) False
  5. 5.🦾 A servo program runs:
    angle = 20
    angle = angle + 10
    angle = angle − 10
    angle = angle + 10
    angle = angle + 60
    To what angle (in degrees) does the servo turn in the end?
  6. 6.True or false: “reverses if wires swap” is true of a DC motor. (a) True (b) False
  7. 7.⚙️ DC motor or servo motor: which one spins round and round? (a) a DC motor (b) a servo motor
  8. 8.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a servo motor (b) a DC motor
  9. 9.🦾 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 up and left (c) points straight up (d) points right
  10. 10.🦾 A servo moves from 30° to 130°. How many degrees does it turn?
  11. 11.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a DC motor (b) a buzzer (c) a light sensor (d) a servo motor
  12. 12.🦾 A servo program runs:
    angle = 100
    angle = angle − 60
    angle = angle + 50
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?
  13. 13.⚙️ DC motor or servo motor: which one holds a set angle? (a) a servo motor (b) a DC motor
  14. 14.🦾 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 straight up (d) points right
  15. 15.🦾 A servo moves from 110° to 70°. How many degrees does it turn?
  16. 16.🦾 A servo program runs:
    angle = 60
    angle = angle + 30
    angle = angle + 30
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?
  17. 17.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a DC motor (b) a servo motor
  18. 18.⚙️ A motor changes electrical energy into … (a) water (b) light (c) movement (d) sound only
  19. 19.True or false: “holds a set angle” is true of a servo motor. (a) True (b) False
  20. 20.🦾 A servo moves from 110° to 0°. How many degrees does it turn?
  21. 21.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
  22. 22.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a DC motor (b) a servo motor
  23. 23.⚙️ DC motor or servo motor: which one has just two wires? (a) a DC motor (b) a servo motor
  24. 24.⚙️ DC motor or servo motor: which one drives the wheels? (a) a servo motor (b) a DC motor
  25. 25.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
  26. 26.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a DC motor (b) a servo motor
  27. 27.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?
  28. 28.🦾 A servo program runs:
    angle = 10
    angle = angle + 30
    angle = angle − 40
    angle = angle + 60
    angle = angle − 40
    To what angle (in degrees) does the servo turn in the end?
  29. 29.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a DC motor (b) a fan (c) a servo motor (d) a buzzer
  30. 30.🦾 A servo program runs:
    angle = 110
    angle = angle + 30
    angle = angle + 40
    angle = angle − 40
    To what angle (in degrees) does the servo turn in the end?
  31. 31.⚙️ How do you make a DC motor spin the other way? (a) shake it (b) swap its two wires (c) add more wheels (d) paint it red
  32. 32.🦾 A servo program runs:
    angle = 30
    angle = angle + 40
    angle = angle + 10
    angle = angle + 50
    angle = angle + 40
    To what angle (in degrees) does the servo turn in the end?
  33. 33.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a servo motor (b) a DC motor
  34. 34.True or false: “has a signal wire” is true of a DC motor. (a) False (b) True
  35. 35.True or false: “usually turns 0° to 180°” is true of a DC motor. (a) True (b) False
  36. 36.🦾 A servo program runs:
    angle = 50
    angle = angle + 60
    angle = angle − 50
    angle = angle + 20
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?
  37. 37.⚙️ DC motor or servo motor: which one has a signal wire? (a) a DC motor (b) a servo motor
  38. 38.🦾 A servo moves from 30° to 100°. How many degrees does it turn?
  39. 39.True or false: “spins faster with more V” is true of a DC motor. (a) True (b) False
  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 up and right (c) points left (d) points straight up

Answer key

  1. 100
  2. True
  3. 300
  4. True
  5. 90
  6. True
  7. a DC motor
  8. a servo motor
  9. points up and left
  10. 100
  11. a DC motor
  12. 70
  13. a servo motor
  14. points left
  15. 40
  16. 100
  17. a DC motor
  18. movement
  19. True
  20. 110
  21. 50
  22. a servo motor
  23. a DC motor
  24. a DC motor
  25. 100
  26. a DC motor
  27. 150
  28. 20
  29. a servo motor
  30. 140
  31. swap its two wires
  32. 170
  33. a servo motor
  34. False
  35. False
  36. 60
  37. a servo motor
  38. 70
  39. True
  40. points up and right

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