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Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 455 · 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.True or false: “turns to an exact angle” is true of a servo motor. (a) False (b) True
  2. 2.⚙️ How do you make a DC motor spin the other way? (a) shake it (b) add more wheels (c) swap its two wires (d) paint it red
  3. 3.True or false: “has a signal wire” is true of a DC motor. (a) True (b) False
  4. 4.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
  5. 5.🦾 A servo program runs:
    angle = 40
    angle = angle − 40
    angle = angle + 20
    To what angle (in degrees) does the servo turn in the end?
  6. 6.⚙️ DC motor or servo motor: which one holds a set angle? (a) a DC motor (b) a servo motor
  7. 7.🦾 A servo moves from 40° to 100°. How many degrees does it turn?
  8. 8.🦾 A servo program runs:
    angle = 60
    angle = angle − 20
    angle = angle + 60
    angle = angle + 20
    angle = angle + 20
    To what angle (in degrees) does the servo turn in the end?
  9. 9.True or false: “spins round and round” is true of a servo motor. (a) False (b) True
  10. 10.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a DC motor (b) a servo motor
  11. 11.⚙️ DC motor or servo motor: which one drives the wheels? (a) a DC motor (b) a servo motor
  12. 12.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a servo motor (b) a DC motor
  13. 13.🦾 A servo program runs:
    angle = 30
    angle = angle − 20
    angle = angle + 10
    angle = angle + 10
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
  14. 14.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
  15. 15.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
  16. 16.⚙️ DC motor or servo motor: which one has a signal wire? (a) a DC motor (b) a servo motor
  17. 17.True or false: “moves an arm joint” is true of a servo motor. (a) True (b) False
  18. 18.🦾 A servo program runs:
    angle = 70
    angle = angle − 40
    angle = angle − 10
    angle = angle + 30
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?
  19. 19.🦾 A servo program runs:
    angle = 120
    angle = angle − 30
    angle = angle − 40
    angle = angle + 20
    angle = angle + 40
    To what angle (in degrees) does the servo turn in the end?
  20. 20.⚙️ DC motor or servo motor: which one has just two wires? (a) a DC motor (b) a servo motor
  21. 21.🦾 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 up and right (b) points straight up (c) points up and left (d) points left
  22. 22.⚙️ A motor changes electrical energy into … (a) sound only (b) light (c) water (d) movement
  23. 23.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a DC motor (b) a servo motor (c) a buzzer (d) a fan
  24. 24.True or false: “has just two wires” is true of a DC motor. (a) True (b) False
  25. 25.True or false: “spins faster with more V” is true of a servo motor. (a) True (b) False
  26. 26.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a DC motor (b) a servo motor
  27. 27.🦾 A servo program runs:
    angle = 160
    angle = angle − 40
    angle = angle + 50
    To what angle (in degrees) does the servo turn in the end?
  28. 28.True or false: “has just two wires” is true of a servo motor. (a) True (b) False
  29. 29.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a servo motor (b) a DC motor
  30. 30.🦾 A servo program runs:
    angle = 0
    angle = angle + 10
    angle = angle + 20
    angle = angle − 10
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
  31. 31.🦾 A servo program runs:
    angle = 0
    angle = angle + 40
    angle = angle − 40
    To what angle (in degrees) does the servo turn in the end?
  32. 32.True or false: “usually turns 0° to 180°” is true of a DC motor. (a) False (b) True
  33. 33.🦾 A servo moves from 60° to 40°. How many degrees does it turn?
  34. 34.🦾 A servo moves from 120° to 20°. How many degrees does it turn?
  35. 35.🦾 A servo program runs:
    angle = 110
    angle = angle + 10
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
  36. 36.🦾 A servo moves from 50° to 40°. How many degrees does it turn?
  37. 37.🦾 A servo moves from 0° to 60°. How many degrees does it turn?
  38. 38.🦾 A servo program runs:
    angle = 0
    angle = angle + 20
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?
  39. 39.🦾 A servo program runs:
    angle = 140
    angle = angle − 60
    angle = angle + 10
    angle = angle + 40
    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 180°. Where does the arm point? (a) points left (b) points up and right (c) points right (d) points straight up

Answer key

  1. True
  2. swap its two wires
  3. False
  4. 50
  5. 20
  6. a servo motor
  7. 60
  8. 140
  9. False
  10. a DC motor
  11. a DC motor
  12. a DC motor
  13. 40
  14. 300
  15. 200
  16. a servo motor
  17. True
  18. 30
  19. 110
  20. a DC motor
  21. points straight up
  22. movement
  23. a servo motor
  24. True
  25. False
  26. a servo motor
  27. 170
  28. False
  29. a servo motor
  30. 10
  31. 0
  32. False
  33. 20
  34. 100
  35. 130
  36. 10
  37. 60
  38. 0
  39. 130
  40. points left

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