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Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 364 · 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 has a signal wire? (a) a DC motor (b) a servo motor
  2. 2.🦾 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 up and left (b) points up and right (c) points right (d) points left
  3. 3.⚙️ DC motor or servo motor: which one has just two wires? (a) a DC motor (b) a servo motor
  4. 4.⚙️ DC motor or servo motor: which one drives the wheels? (a) a servo motor (b) a DC motor
  5. 5.True or false: “spins faster with more V” is true of a servo motor. (a) True (b) False
  6. 6.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
  7. 7.True or false: “reverses if wires swap” is true of a DC motor. (a) True (b) False
  8. 8.True or false: “holds a set angle” is true of a DC motor. (a) True (b) False
  9. 9.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a DC motor (b) a servo motor
  10. 10.🦾 A servo program runs:
    angle = 80
    angle = angle − 40
    angle = angle + 40
    angle = angle + 40
    To what angle (in degrees) does the servo turn in the end?
  11. 11.⚙️ DC motor or servo motor: which one spins round and round? (a) a DC motor (b) a servo motor
  12. 12.🦾 A servo moves from 0° to 140°. How many degrees does it turn?
  13. 13.True or false: “turns to an exact angle” is true of a DC motor. (a) False (b) True
  14. 14.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?
  15. 15.🦾 A servo program runs:
    angle = 140
    angle = angle − 50
    angle = angle + 30
    To what angle (in degrees) does the servo turn in the end?
  16. 16.⚙️ A motor changes electrical energy into … (a) movement (b) light (c) sound only (d) water
  17. 17.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
  18. 18.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a servo motor (b) a DC motor
  19. 19.🦾 A servo program runs:
    angle = 20
    angle = angle + 30
    angle = angle − 50
    To what angle (in degrees) does the servo turn in the end?
  20. 20.True or false: “drives the wheels” is true of a servo motor. (a) False (b) True
  21. 21.⚙️ How do you make a DC motor spin the other way? (a) shake it (b) swap its two wires (c) paint it red (d) add more wheels
  22. 22.True or false: “usually turns 0° to 180°” is true of a servo motor. (a) True (b) False
  23. 23.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a servo motor (b) a DC motor (c) a light sensor (d) a buzzer
  24. 24.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a servo motor (b) a DC motor
  25. 25.True or false: “has just two wires” is true of a servo motor. (a) False (b) True
  26. 26.🦾 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 left (b) points left (c) points up and right (d) points straight up
  27. 27.🦾 A servo moves from 0° to 40°. How many degrees does it turn?
  28. 28.🦾 A servo program runs:
    angle = 160
    angle = angle − 20
    angle = angle − 60
    angle = angle + 40
    angle = angle + 30
    To what angle (in degrees) does the servo turn in the end?
  29. 29.True or false: “has a signal wire” is true of a servo motor. (a) True (b) False
  30. 30.🦾 A servo moves from 160° to 130°. How many degrees does it turn?
  31. 31.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a buzzer (b) a servo motor (c) a fan (d) a DC motor
  32. 32.🦾 A servo moves from 0° to 50°. How many degrees does it turn?
  33. 33.True or false: “usually turns 0° to 180°” is true of a DC motor. (a) False (b) True
  34. 34.True or false: “has a signal wire” is true of a DC motor. (a) False (b) True
  35. 35.🦾 A servo moves from 150° to 50°. How many degrees does it turn?
  36. 36.🦾 A servo moves from 50° to 60°. How many degrees does it turn?
  37. 37.🦾 A servo program runs:
    angle = 0
    angle = angle + 10
    angle = angle + 40
    angle = angle − 50
    To what angle (in degrees) does the servo turn in the end?
  38. 38.True or false: “moves an arm joint” is true of a servo motor. (a) False (b) True
  39. 39.🦾 A servo program runs:
    angle = 20
    angle = angle + 10
    angle = angle + 40
    angle = angle + 60
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
  40. 40.🦾 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 up and left

Answer key

  1. a servo motor
  2. points left
  3. a DC motor
  4. a DC motor
  5. False
  6. 200
  7. True
  8. False
  9. a DC motor
  10. 120
  11. a DC motor
  12. 140
  13. False
  14. 150
  15. 120
  16. movement
  17. 50
  18. a servo motor
  19. 0
  20. False
  21. swap its two wires
  22. True
  23. a DC motor
  24. a DC motor
  25. False
  26. points up and left
  27. 40
  28. 150
  29. True
  30. 30
  31. a servo motor
  32. 50
  33. False
  34. False
  35. 100
  36. 10
  37. 0
  38. True
  39. 120
  40. points right

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